Energy storage device

Abstract

The present invention provides an energy storage device, comprising: a box body and an inverter. The box body is adapted to accommodate a battery module. The battery module includes a liquid injection nozzle. The inverter is adapted to be connected to a power grid or an electrical device; a wiring system adapted to connect the battery module to the inverter; a negative pressure system adapted to generate a negative pressure at the liquid injection nozzle. In the above structure, the battery module can be formed and capacity-divided in the box body of the energy storage device, without the need to frequently transfer between different devices, improving production efficiency. Moreover, during the transportation of the energy storage device, the formation and capacity-dividing process of the internal battery module can also be carried out, shortening the delivery cycle of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy energy storage, and particularly relates to an energy storage device. Background Art

[0002] An energy storage container is a device that can collect energy generated by devices such as solar photovoltaic panels, wind turbines, fuel cells, and generator sets, and convert the collected energy into a usable form of electricity. A plurality of batteries are arranged in the energy storage container, and the batteries can be charged and discharged. During the production process of the batteries, after injection of liquid, the batteries need to be formed and sorted. The forming and sorting are carried out separately in a forming cabinet and a sorting cabinet, and the batteries need to be static for a certain period of time during the forming and sorting processes. After the batteries are formed and sorted, they are loaded into the energy storage container. In the above process, the production of the batteries from forming to packing requires multiple devices and involves transfer between different devices, resulting in low production efficiency of the batteries and an increase in the battery delivery cycle. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that in the existing energy storage container, the batteries from forming to packing need to be carried out between multiple devices, resulting in low production efficiency and long battery delivery cycle, and thus provide an energy storage device.

[0004] To solve the above problems, the present invention provides an energy storage device, including: a box body and an inverter. The box body is adapted to accommodate a battery module. The battery module includes a liquid injection nozzle. The inverter is adapted to be connected to a power grid or an electrical device; a wiring system adapted to connect the battery module to the inverter; and a negative pressure system adapted to generate negative pressure at the liquid injection nozzle.

[0005] Optionally, the battery module further includes a first pole column and a second pole column. The wiring system includes a first connecting wire and a second connecting wire. The first end of the first connecting wire is adapted to be connected to the first pole column, and the first end of the second connecting wire is adapted to be connected to the second pole column. The second ends of the first connecting wire and the second connecting wire are both connected to the inverter.

[0006] Optionally, a power control module is arranged on the first connecting wire and the second connecting wire.

[0007] Optionally, the battery module includes a plurality of battery units. The first end of the first connecting wire is adapted to be connected to the first pole column of the first battery unit among the plurality of battery units, and the first end of the second connecting wire is adapted to be connected to the second pole column of the last battery unit among the plurality of battery units. The wiring system further includes a third connecting wire adapted to connect the first pole column and the second pole column of adjacent battery units so that the plurality of battery units are connected in series.

[0008] Optionally, the wiring system further includes a cut-off connecting line, both ends of the cut-off connecting line are adapted to communicate with the first and second pole posts of the battery unit, and a first switch structure is provided on the cut-off connecting line. In the current loop, a second switch structure is provided at the first pole post and / or the second pole post of the battery unit.

[0009] Optionally, there are multiple cut-off connecting lines, and the multiple cut-off connecting lines are arranged in one-to-one correspondence with multiple battery units.

[0010] Optionally, a voltage measuring device is provided at the cut-off connecting line.

[0011] Optionally, both ends of the cut-off connecting line are respectively connected to adjacent third connecting lines; or, both ends of the cut-off connecting line are respectively connected to the third connecting line and the first connecting line; or, both ends of the cut-off connecting line are respectively connected to the third connecting line and the second connecting line.

[0012] Optionally, in the non-first-end battery units and non-last-end battery units of the multiple battery units, the second switch structure is provided on the third connecting line and is located between the connection point of the cut-off connecting line and the third connecting line and the first pole post, and / or, between the connection point of the cut-off connecting line and the third connecting line and the second pole post; in the first-end battery unit, the second switch structure is provided on the third connecting line and is located between the connection point of the cut-off connecting line and the third connecting line and the second pole post; and / or, the second switch structure is provided on the first connecting line and is located between the connection point of the cut-off connecting line and the first connecting line and the first pole post; in the last-end battery unit, the second switch structure is provided on the third connecting line and is located between the connection point of the cut-off connecting line and the third connecting line and the first pole post; and / or, the second switch structure is provided on the second connecting line and is located between the connection point of the cut-off connecting line and the second connecting line and the second pole post.

[0013] Optionally, the multiple battery modules include multiple battery groups, each battery group includes multiple battery units, the different battery groups are connected in parallel, and the battery units within the same battery group are connected in series through the third connecting line.

[0014] Optionally, the first connecting line includes multiple parallel first branches, and the multiple first branches are respectively adapted to be connected to the first pole posts of the first-end battery units of the multiple battery groups; and / or, the second connecting line includes multiple parallel second branches, and the multiple second branches are respectively adapted to be connected to the second pole posts of the last-end battery units of the multiple battery groups, and a power control module is provided on the first branch and the second branch corresponding to each battery group.

[0015] Optionally, the negative pressure system includes a pipeline and connectors all communicating with the pipeline, and the multiple connectors are adapted to be connected to the liquid injection nozzles of the battery module.

[0016] Optionally, a one-way valve is provided at the liquid injection nozzle. The one-way valve includes a valve body and a valve core disposed within the valve body. The valve body has a first opening and a second opening that communicate with the liquid injection nozzle. The valve core closes the second opening and is adapted to allow the fluid within the battery module to flow unidirectionally from the first opening to the second opening. The connector is connected to the valve body and communicates with the second opening, and the connector is adapted to open the second opening.

[0017] Optionally, the one-way valve further includes an elastic reset member. The elastic reset member is disposed on a side of the valve core facing the first opening and abuts the valve core against the second opening. The connector includes a push rod. When the connector is connected to the valve body, the push rod extends into the second opening and pushes the valve core to open the second opening.

[0018] Optionally, the energy storage device further includes a liquid injection system. The liquid injection system is adapted to inject liquid into the battery module through the liquid injection nozzle.

[0019] Optionally, the negative pressure system and the liquid injection system share pipelines and connectors. The pipeline is adapted to be connected to a vacuum device, or the pipeline is adapted to be connected to a liquid injection device.

[0020] Optionally, the battery module includes a plurality of battery cells. A plurality of connectors are provided on the pipeline, and the plurality of connectors are respectively connected to the liquid injection nozzles of the plurality of battery cells in a one-to-one correspondence.

[0021] Optionally, the plurality of battery modules include a plurality of battery packs. Each battery pack includes a plurality of battery cells. The pipeline includes a plurality of third branches, and the connectors on the plurality of third branches are respectively adapted to be connected to the liquid injection nozzles of the batteries in the plurality of battery packs.

[0022] Optionally, the box body includes a box base and a box cover covering the box base. The battery module is adapted to be placed within the box base, and the box cover is adapted to cover above the battery. The wiring system and / or the negative pressure system is disposed on the box cover.

[0023] Optionally, the plurality of battery modules include a plurality of battery packs. Each battery pack includes a plurality of battery cells. The plurality of battery packs are stacked and arranged within the box base. There are a plurality of box covers, and the box covers are used to cover above the battery packs located below and are used to carry the battery packs located above.

[0024] Optionally, the plurality of battery modules include a plurality of battery packs. Each battery pack includes a plurality of battery cells. There are a plurality of box bodies, and the plurality of battery packs are respectively disposed within the plurality of box bodies in a one-to-one correspondence.

[0025] Optionally, the plurality of battery modules include a plurality of battery packs. Each battery pack includes a plurality of battery cells. The plurality of battery packs are horizontally spaced and arranged within the box base. There are a plurality of box covers, and the plurality of box covers respectively cover above the plurality of battery packs, or the box cover covers on the plurality of battery packs and covers the plurality of battery packs.

[0026] The present invention has the following advantages:

[0027] Using the technical solution of the present invention, after the battery module is filled with liquid, it is directly placed into the box body of the energy storage device. The wiring system connects the battery module to the inverter, and the negative pressure system generates negative pressure at the liquid injection nozzle of the battery module. After the inverter converts the current, it supplies power to the battery module through the wiring system, thereby performing the formation process on the battery module. During the formation process, the negative pressure system is started, and the gas generated in the battery module is extracted through the liquid injection nozzle. Then, after the inverter converts the current, it performs charge and discharge through the wiring system, thereby performing formation and grading on the battery module. After the formation is completed, the battery module does not need to be additionally packed. Therefore, in the above structure, the battery module can perform formation and grading in the box body of the energy storage device, without the need to frequently transfer between different devices, improving production efficiency. Moreover, the energy storage device can also perform the formation and grading process on the internal battery module during transportation, shortening the battery delivery cycle. Therefore, the technical solution of the present invention solves the defects in the prior art that the battery in the energy storage container needs to be formed and packed between multiple devices, resulting in low production efficiency and long battery delivery cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 Shows a schematic diagram of the cooperation of the battery, wiring system, and negative pressure system of the energy storage device of the present invention;

[0030] Figure 2 Shows Figure 1 A schematic diagram of the cooperation of a certain battery pack with the wiring system and the negative pressure system (the second switch structure is not shown);

[0031] Figure 3 Shows three setting methods of the second switch structure of the non-first-end battery unit and the non-last-end battery unit in multiple battery units;

[0032] Figure 4 Shows three setting methods of the second switch structure of the first-end battery unit in multiple battery units;

[0033] Figure 5 Shows three setting methods of the second switch structure of the last-end battery unit in multiple battery units;

[0034] Figure 6 Shows Figure 1Schematic structural diagram of the one-way valve of the energy storage device;

[0035] Figure 7 Shows Figure 6 Schematic diagram of exhaust and liquid injection after the one-way valve in the energy storage device is opened by the connector;

[0036] Figure 8 Shows a schematic structural diagram of Embodiment 1 of the cooperation between the box body and the battery of the energy storage device of the present invention;

[0037] Figure 9 Shows a schematic structural diagram of Embodiment 2 of the cooperation between the box body and the battery of the energy storage device of the present invention;

[0038] Figure 10 Shows a schematic structural diagram of Embodiment 3 of the cooperation between the box body and the battery of the energy storage device of the present invention.

[0039] Explanation of reference numerals:

[0040] 10. Box body; 11. Box seat; 12. Box cover; 20. Inverter; 30. Battery unit; 31. First pole; 32. Second pole; 33. Liquid injection nozzle; 301. First-end battery unit; 302. Last-end battery unit; 40. Wiring system; 41. First connecting wire; 411. First branch; 42. Second connecting wire; 421. Second branch; 43. Third connecting wire; 44. Cut-off connecting wire; 441. First switch structure; 442. Second switch structure; 50. Negative pressure system; 51. Pipeline; 511. Third branch; 52. Connector; 521. Thumb rod; 53. One-way valve; 531. Valve body; 5311. First opening; 5312. Second opening; 532. Valve core; 533. Elastic reset member; 60. Liquid injection system; 70. Power control module; 100. Battery pack. Detailed implementation manners

[0041] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Embodiment 1

[0046] As Figure 1 、 Figure 2 and Figure 8 shown, Embodiment 1 of the energy storage device according to the present application includes a box body 10, an inverter 20, a wiring system 40, and a negative pressure system 50. Among them, the box body 10 is adapted to accommodate a battery module, and the battery module includes a liquid injection nozzle 33. The inverter 20 is adapted to be connected to the power grid or an electrical device. The wiring system 40 is adapted to connect the battery module to the inverter 20. The negative pressure system 50 is adapted to generate a negative pressure at the liquid injection nozzle 33 of the battery module.

[0047] Using the technical solution of this embodiment, after the battery module is filled with liquid, it is directly placed into the box body 10 of the energy storage device. The wiring system 40 connects the battery module to the inverter 20, and the negative pressure system 50 generates a negative pressure at the liquid injection nozzle 33 of the battery module. After the inverter 20 converts the current, it supplies power to the battery module through the wiring system 40, thereby performing the formation process on the battery module. During the formation process, the negative pressure system 50 is started, and the gas generated in the battery module is extracted through the liquid injection nozzle 33. Then, after the inverter 20 converts the current, it performs charge and discharge through the wiring system 40, thereby performing the formation on the battery module. After the formation is completed, the battery module does not need to be packed additionally. Therefore, in the above structure, the battery module can perform formation and grading in the box body 10 of the energy storage device, without the need to frequently transfer between different devices, improving production efficiency. Moreover, the energy storage device can also perform the formation and grading process on the internal battery module during transportation, shortening the delivery cycle of the battery. Therefore, the technical solution of this embodiment solves the defects in the prior art that the battery in the energy storage container needs to be transferred between multiple devices from formation to packing, with low production efficiency and long battery delivery cycle.

[0048] It should be noted that the battery module of this embodiment can be composed of one battery cell or multiple battery units 30. When the battery module is one battery cell, the battery cell can be a large-capacity battery, that is, the battery cell can meet the charge and discharge requirements of the energy storage device.

[0049] When the battery is composed of multiple battery units 30, the composition method can be: multiple battery units 30 form a battery pack 100, or the battery module includes multiple battery packs 100, and each battery pack 100 includes multiple battery units 30.

[0050] As Figure 8 shown, the box body 10 has an accommodation space, and multiple battery units 30 are assembled in the box body 10. The wiring system 40 can connect multiple battery units 30 to the inverter 20. Among them, the connection methods can include:

[0051] 1. Multiple battery units 30 are connected in series and then connected to the inverter 20;

[0052] 2. Multiple battery units 30 are each independently connected to the inverter 20, that is, multiple battery units 30 are connected in parallel;

[0053] 3. In the case where the battery module includes multiple battery packs 100, each battery pack 100 includes multiple battery units 30. The multiple battery units 30 in each battery pack 100 are connected in series, and the multiple battery packs 100 are connected in parallel and then connected to the inverter 20.

[0054] Further, the inverter 20 is adapted to be connected to a power grid or an electrical device, and is capable of converting direct current into alternating current, or converting alternating current into direct current. The inverter 20 can input direct current to the battery unit 30 to charge the battery unit 30, or after the direct current released by the battery unit 30 passes through the inverter 20, the inverter converts the direct current into alternating current and then inputs it to the power grid or the electrical device. That is, the battery unit 30 can be charged and discharged through the inverter 20.

[0055] As Figure 1 , Figure 2 and Figure 6 shown, the negative pressure system 50 includes a pipeline 51 and a joint 52. Among them, the pipeline 51 is used to connect to an external negative pressure device so that a negative pressure environment can be formed in the pipeline 51, and the joint 52 is connected to the liquid injection nozzle 33 of the battery unit 30. A one-way valve 53 is provided at the liquid injection nozzle 33 of the battery unit 30, and the one-way valve 53 allows the fluid to flow only unidirectionally from the outside of the battery unit 30 towards the inside. The one-way valve 53 includes a valve core 532, and an elastic reset member 533 is provided on one side of the valve core 532. The elastic reset member 533 presses the valve core 532 tightly so that the one-way valve 53 is closed when the valve core 532 is not subjected to external force.

[0056] Further, as Figure 7 shown, when the negative pressure system 50 works, the joint 52 is connected to the one-way valve 53 and pushes the valve core 532 to overcome the elastic force of the elastic reset member 533, so that the one-way valve 53 is opened. As Figure 7 shown in A, at this time, the negative pressure in the pipeline 51 can extract the gas inside the battery unit 30 from the liquid injection nozzle 33. When the negative pressure system 50 does not work, the joint 52 is separated from the one-way valve 53, and the elastic reset member 533 presses the valve core 532 of the one-way valve 53 tightly again to close the liquid injection nozzle 33. At this time, the electrolyte in the battery unit 30 cannot flow out from the one-way valve 53, thus preventing the battery unit 30 from leaking.

[0057] Based on the above structure, the formation, grading, charging and discharging processes of the battery in the box 10 in this embodiment are introduced as follows:

[0058] Formation: The grid voltage converts alternating current into high-voltage direct current through the inverter 20. The high-voltage direct current charges the battery module through the wiring system 40, and activates the electrolyte in the battery module to form a SEI film. At the same time, the negative pressure system 50 is started, and the bubbles inside the battery module during the formation process can be extracted through the liquid injection nozzle 33.

[0059] Formation and grading: The grid voltage is converted into high-voltage direct current by the inverter 20, and the high-voltage direct current charges and discharges the battery module through the wiring system 40 to calculate the capacity of the battery module (when the battery module includes multiple battery cells 30, the capacity of a single battery cell 30 needs to be calculated). During the grading and discharging process of the battery module, the inverter 20 reversely converts the direct current discharged by the battery into alternating current and then feeds it back to the grid or electrical equipment.

[0060] Energy storage device discharging: After the battery module discharges, the direct current is reversely converted into alternating current by the inverter 20 and then transmitted to the grid or electrical equipment.

[0061] It can be seen that the battery module can be formed, graded, and discharged within the box 10. Therefore, after the battery is filled with liquid in the factory, it can be packed into the box 10. During the transportation of the energy storage device, the battery module can complete the formation and grading processes within the box 10, significantly shortening the delivery time of the battery energy storage device.

[0062] Such as Figure 1 and Figure 2 As shown, a power control module 70 is also provided on the wiring system 40. The power control module 70 is arranged between the inverter 20 and the battery module, responsible for controlling the charging and discharging of the battery module, collecting the status information of the battery module, and realizing the capacity evaluation of the battery module. In this embodiment, the power control module 70 is a DCDC module, and its function is to control the direct current and voltage on both sides of it, so as to achieve the effect of stabilizing the current and voltage.

[0063] During the formation process of the above-mentioned battery module, the power control module 70 receives the process parameters required for the formation of the battery module and controls the magnitude of the output current according to the formation step parameters to activate the battery module to generate the SEI film.

[0064] During the grading process of the above-mentioned battery module, the power control module 70 controls the charging and discharging process of the battery module to calculate the capacity of the battery module.

[0065] During the charging and discharging process of the above-mentioned battery module, the power control module plays a role in stabilizing the current and voltage.

[0066] Such as Figure 1 and Figure 2As shown, in the technical solution of this embodiment, the battery module further includes a first terminal 31 and a second terminal 32. The wiring system 40 includes a first connection line 41 and a second connection line 42. Among them, the first end of the first connection line 41 is adapted to be connected to the first terminal 31 of the battery module, and the first end of the second connection line 42 is adapted to be connected to the second terminal 32 of the battery module. The second ends of the first connection line 41 and the second connection line 42 are both connected to the inverter 20, and the first connection line 41 and the second connection line 42 connect the battery module to the inverter 20.

[0067] Specifically, the first terminal 31 and the second terminal 32 of the battery module are two terminals with opposite polarities. In this embodiment, the first terminal 31 is the negative terminal, and the second terminal 32 is the positive terminal. Of course, the polarities of the first terminal 31 and the second terminal 32 can also be reversed, that is, the first terminal 31 is the positive terminal and the second terminal 32 is the negative terminal.

[0068] Furthermore, probes are provided at the ends of the first connection line 41 and the second connection line 42. The first connection line 41 is connected to the first terminal 31 through the probe, and the second connection line 42 is connected to the second terminal 32 through the probe.

[0069] From Figure 1 and Figure 2 it can be seen that the above-mentioned power control module 70 is provided on the first connection line 41 and the second connection line 42. Therefore, the power control module 70 can adjust and control the current and voltage input to the battery module, as well as the current and voltage output from the battery module.

[0070] As Figure 2 shown, when the battery module includes a plurality of battery cells 30, the wiring system 40 further includes a third connection line 43. Specifically, the first end of the first connection line 41 is adapted to be connected to the first terminal 31 of the first battery cell 301 among the plurality of battery cells 30. The first end of the second connection line 42 is adapted to be connected to the second terminal 32 of the last battery cell 302 among the plurality of battery cells 30. Further, the third connection line 43 is adapted to connect the first terminal 31 and the second terminal 32 of adjacent battery cells 30 so that the plurality of battery cells 30 are connected in series.

[0071] It should be noted that the above-mentioned "first battery cell 301" and "last battery cell 302" refer to the battery cells 30 that are at the first end and the last end in the circuit when the plurality of battery cells 30 are connected in series. "First end" and "last end" should not be understood as a limitation on the placement positions of the plurality of battery cells 30. In fact, those skilled in the art can arbitrarily adjust the placement positions of the plurality of battery cells 30 according to actual needs.

[0072] Further, the third connection line 43 is used to connect multiple battery cells 30 in series. That is, in adjacent battery cells 30, the third connection line 43 connects the pole posts of different polarities. Taking Figure 2 the content shown as an example, for the third battery cell 30 from left to right, the first pole post 31 of this battery cell 30 is connected to the second pole post 32 of the battery cell 30 on the right through the third connection line 43, and the second pole post 32 of this battery cell 30 is connected to the first pole post 31 of the battery cell 30 on the left through the third connection line 43.

[0073] Further, probes are provided at both ends of the third connection line 43, and the third connection line 43 is connected to the first pole post 31 and the second pole post 32 of the adjacent battery cell 30 through the probes.

[0074] A plurality of third connection lines 43 are provided, and the specific number can be determined according to the number of battery cells 30. For example Figure 2 if four battery cells 30 are shown, then three third connection lines 43 are required to connect the four battery cells 30 in series.

[0075] Those skilled in the art can understand that when only one single battery is included in the battery module, the above-mentioned third connection line 43 does not need to be provided.

[0076] Further, the first connection line 41 and the second connection line 42 are used to connect the multiple series-connected battery cells 30 to the inverter 20. Taking Figure 2 the content shown as an example, among the four series-connected battery cells 30, it is stipulated that the battery cell 30 on the right is the head-end battery cell 301, and the battery cell 30 on the left is the end-end battery cell 302. One end of the first connection line 41 is connected to the inverter 20, and the other end is connected to the first pole post 31 of the head-end battery cell 301. One end of the second connection line 42 is connected to the inverter 20, and the other end is connected to the second pole post 32 of the end-end battery cell 302. With such a setting, the multiple series-connected battery cells 30 are connected to the inverter 20 from head to tail.

[0077] It should be noted that the above-mentioned probes can be used simultaneously in the formation and grading of the battery module, as well as in the charge and discharge process of the battery module. That is, after the battery module completes the formation and grading process, there is no need to replace the connection lines and probes, and the subsequent charge and discharge work can be directly carried out.

[0078] Specifically, the voltage and current passed during the formation and grading of the battery module are greater than the voltage and current passed during the charge and discharge work of the battery module. Therefore, when the above-mentioned probes can withstand the voltage and current during the formation and grading process, they can also withstand the voltage and current impact during the charge and discharge work.

[0079] Further, the surface of the probe is made of gold-plated material, and the surface of the probe is provided with dense needles. When the probe contacts the first pole 31 or the second pole 32 of the battery module, the needles will pierce the first pole 31 and the second pole 32, thereby forming a stable connection and enabling large current charge and discharge.

[0080] As Figure 2 shown, in the technical solution of this embodiment, the wiring system 40 further includes a cut-off connection line 44. The two ends of the cut-off connection line 44 are adapted to be connected to the first pole 31 and the second pole 32 of the battery unit 30, and a first switch structure 441 is provided on the cut-off connection line 44. And as Figures 3 to 4 shown, in the current loop, a second switch structure 442 is provided at the first pole 31 and / or the second pole 32 of the battery unit 30. Specifically, the cut-off connection line 44, the first switch structure 441 and the second switch structure 442 have two functions, which are introduced in turn below.

[0081] First, the first function of the cut-off connection line 44, the first switch structure 441 and the second switch structure 442 is that when a certain battery unit 30 fails, the cut-off connection line 44 is used to cut off and isolate the battery unit 30 from the circuit. The failure may occur during the formation process, the grading process or the discharging process of the battery unit 30.

[0082] Further, when the battery unit 30 is operating normally, the first switch structure 441 on the cut-off connection line 44 is normally open, and the second switch structure 442 is closed, that is, the cut-off connection line 44 is an open circuit, and current can flow from the first pole 31 of the battery unit 30 to the second pole 32, that is, the battery unit 30 is normally in the circuit and is charging or discharging. When a certain battery unit 30 fails, the first switch structure 441 on the cut-off connection line 44 corresponding to the battery unit 30 is closed, so the cut-off connection line 44 is a conducting path. At the same time, in order to prevent the battery unit 30 from being short-circuited, the second switch structure 442 corresponding to the battery unit 30 is opened. At this time, the current in the circuit will directly flow to the next battery unit 30 downstream through the cut-off connection line 44, rather than through the faulty battery unit 30, thereby achieving the effect of cutting off and isolating the faulty battery unit 30.

[0083] Therefore, the statement "in the current loop, a second switch structure 442 is provided at the first pole 31 and / or the second pole 32 of the battery cell 30" means that when the first switch structure 441 is closed and the second switch structure 442 is open, the current will pass through the cut-off connection line 44 and will not pass through the first pole 31 and / or the second pole 32, that is, at least one end of the cut-off connection line 44 is not connected to the first pole 31 and the second pole 32, preventing the cut-off connection line 44 from short-circuiting the corresponding battery cell 30 when the first switch structure 441 is closed.

[0084] In the case where the battery module is the above-mentioned one large-capacity battery cell, a cut-off switch may be provided on the first connection line 41 and / or the second connection line 42, and there is no need to provide the above-mentioned cut-off connection line 44.

[0085] As Figure 2 shown, in the technical solution of this embodiment, there are multiple cut-off connection lines 44, and the multiple cut-off connection lines 44 are arranged in one-to-one correspondence with the multiple battery cells 30. Specifically, the number of cut-off connection lines 44 provided is the same as the number of battery cells 30. Taking the content shown in Figure 2 as an example for illustration, Figure 2 shows four battery cells 30, then the cut-off connection lines 44 are also set to four, and both ends of the four cut-off connection lines 44 are connected to the first pole 31 and the second pole 32 of the four battery cells 30 in one-to-one correspondence. Therefore, when any one of the battery cells 30 fails, closing the first switch structure 441 on the corresponding cut-off connection line 44 can cut off and isolate the faulty battery cell 30.

[0086] In some embodiments not shown, those skilled in the art can also provide cut-off connection lines 44 corresponding to a certain one or several battery cells 30.

[0087] In this embodiment, according to the different positions of the battery cells 30, the specific setting positions of the cut-off connection lines 44 are also different. Taking the content described in Figure 2 as an example for illustration.

[0088] When the battery cell 30 is neither the head-end battery cell 301 nor the tail-end battery cell 302 (the two middle battery cells), both ends of the cut-off connection line 44 of this battery cell 30 can be respectively connected to the adjacent third connection line 43.

[0089] When the battery cell 30 is the head-end battery cell 301 (the rightmost battery cell), both ends of the cut-off connection line 44 can be respectively connected to the third connection line 43 and the first connection line 41.

[0090] When the battery cell 30 is the end battery cell 302 (the leftmost battery cell), it is only necessary to connect the two ends of the cut connection line 44 to the third connection line 43 and the second connection line 42 respectively.

[0091] With such a setting, the probes at the end of the first connection line 41, the probes at the end of the second connection line 42, and the probes at the end of the third connection line 43 can be directly used for wiring. Cutting the connection line 44 does not add extra probes, which is convenient for the docking between the wiring system 40 and multiple battery cells 30.

[0092] Of course, the connection method of cutting the connection line 44 is not limited to the above method. As long as the two ends of the cut connection line 44 are connected to the first pole 31 and the second pole 32 of the same battery cell 30 in the circuit. For example, probes can be additionally provided at the end of the cut connection line 44, that is, the cut connection line 44 is connected to the first pole 31 and the second pole 32 of the same battery cell 30 through the probes.

[0093] Furthermore, the setting method of the second switch structure 442 is introduced below.

[0094] First, for a single battery cell 30, the second switch structure 442 can be set only at the first pole 31, or only at the second pole 32, or at both the first pole 31 and the second pole 32. All of these three methods can prevent the corresponding battery cell 30 from being short-circuited when the first switch structure 441 on the cut connection line 44 is closed.

[0095] First, as Figure 3 shown, Figure 3 shows the setting method of the second switch structure 442 of the remaining battery cells 30 except the non-first-end battery cell 301 and the non-end battery cell 302 among multiple battery cells 30, including:

[0096] As Figure 3 shown in A, the second switch structure 442 is set to one, which is set on the third connection line 43 and is located between the connection point of the cut connection line 44 and the third connection line 43 and the second pole 32;

[0097] As Figure 3 shown in B, the second switch structure 442 is set to one, which is set on the third connection line 43 and is located between the connection point of the cut connection line 44 and the third connection line 43 and the first pole 31;

[0098] As Figure 3As shown in C, the second switch structure 442 is provided in two, one of which is provided on the third connection line 43 and is located between the connection point of the cut-off connection line 44 and the third connection line 43 and the second pole 32, and the other is provided on the third connection line 43 and is located between the connection point of the cut-off connection line 44 and the third connection line 43 and the first pole 31.

[0099] Then, as Figure 4 shown, Figure 4 shows the setting manner of the second switch structure 442 of the first battery cell 301 among a plurality of battery cells 30, including:

[0100] As Figure 4 shown in A, the second switch structure 442 is provided as one, which is provided on the third connection line 43 and is located between the connection point of the cut-off connection line 44 and the third connection line 43 and the second pole 32;

[0101] As Figure 4 shown in B, the second switch structure 442 is provided as one, which is provided on the first connection line 41 and is located between the connection point of the cut-off connection line 44 and the first connection line 41 and the first pole 31;

[0102] As Figure 4 shown in C, the second switch structure 442 is provided in two, one of which is provided on the third connection line 43 and is located between the connection point of the cut-off connection line 44 and the third connection line 43 and the second pole 32, and the other is provided on the first connection line 41 and is located between the connection point of the cut-off connection line 44 and the first connection line 41 and the first pole 31.

[0103] Finally, as Figure 5 shown, Figure 5 shows the setting manner of the second switch structure 442 of the last battery cell 302 among a plurality of battery cells 30, including:

[0104] As Figure 5 shown in A, the second switch structure 442 is provided as one, which is provided on the first connection line 41 and is located between the connection point of the cut-off connection line 44 and the first connection line 41 and the second pole 32;

[0105] As Figure 5 shown in B, the second switch structure 442 is provided as one, which is provided on the third connection line 43 and is located between the connection point of the cut-off connection line 44 and the third connection line 43 and the first pole 31;

[0106] As Figure 5As shown in C, there are two second switch structures. One is arranged on the first connecting line 41 and is located between the connection point of the cut-off connecting line 44 and the first connecting line 41 and the second pole 32. The other is arranged on the third connecting line 43 and is located between the connection point of the cut-off connecting line 44 and the third connecting line 43 and the first pole 31.

[0107] Secondly, the second function of the cut-off connecting line 44 is that by arranging a voltage measuring device at the cut-off connecting line 44, the voltage of the corresponding battery unit 30 can be monitored. Since both ends of the cut-off connecting line 44 are connected to the first pole 31 and the second pole 32 of the corresponding battery unit 30, a voltage measuring device is arranged on the cut-off connecting line 44, and the voltage information of the battery unit 30 can be measured, including voltage value information, voltage increase information and voltage decrease information.

[0108] Optionally, the voltage measuring device can be a voltmeter.

[0109] Furthermore, a voltage measuring device is arranged at each cut-off connecting line 44, and each voltage measuring device is communicatively connected to the above-mentioned power control module 70 (such as CAN communication, Ethernet communication, etc.), so as to feedback the voltage information of each battery unit 30 to the power control module 70, and the power control module 70 controls the opening and closing states of the first switch structure 441 and the second switch structure 442 corresponding to each cut-off connecting line 44.

[0110] Specifically, when the power control module 70 monitors that the voltage information of a certain battery unit 30 is abnormal, it is determined that the battery unit 30 fails. At this time, the power control module 70 controls the first switch structure 441 at the battery unit 30 to close and the second switch structure 442 to disconnect, so as to cut out the faulty battery unit 30 from the circuit.

[0111] At the same time, the power control module 70 can judge whether a certain battery unit 30 is fully charged, fully discharged, the grading capacity, etc. by monitoring the power-on time and voltage decrease information, which will be introduced in detail below.

[0112] During the formation process of the battery unit 30, when the power control module 70 monitors that the voltage information of a certain battery unit 30 is abnormal, it is determined that the battery unit 30 is abnormal or fails. At this time, the power control module 70 controls the first switch structure 441 at the battery unit 30 to close and the second switch structure 442 to disconnect, so as to cut out the faulty battery unit 30 from the circuit and interrupt the formation process of the battery unit 30.

[0113] During the formation process of the battery cell 30, during the discharge process, when the power supply control module 70 detects that the voltage of a certain battery cell 30 drops to reach the threshold value, it is determined that the discharge of this battery cell 30 is completed. The power supply control module 70 records the capacity (A.H) of this battery cell 30 according to the product of the current magnitude and the discharge time. And when the power supply control module 70 monitors that the voltage information of a certain battery cell 30 is abnormal, it is determined that this battery cell 30 is abnormal or fails. At this time, the power supply control module 70 controls the first switch structure 441 at this battery cell 30 to close and the second switch structure 442 to open, so as to cut out this faulty battery cell 30 from the circuit and interrupt the formation process of this battery cell 30.

[0114] During the charging process of the battery cell 30, the power supply control module 70 calculates the charging amount of each battery cell 30 through the product of the current and the charging time. When the charging amount of a certain battery cell 30 reaches its capacity, the power supply control module 70 controls the first switch structure 441 at this battery cell 30 to close and the second switch structure 442 to open, so as to cut out this fully charged battery cell 30 from the circuit and prevent continuous charging of this battery cell 30. The power supply control module 70 continuously judges the charging amount of each battery cell 30 until all battery cells 30 are fully charged. And during the charging process, when the power supply control module 70 monitors that the voltage information of a certain battery cell 30 is abnormal, it is determined that this battery cell 30 is abnormal or fails. At this time, the power supply control module 70 controls the first switch structure 441 at this battery cell 30 to close and the second switch structure 442 to open, so as to cut out this faulty battery cell 30 from the circuit and interrupt the charging process of this battery cell 30.

[0115] During the discharge process of the battery cell 30, when it is detected that the voltage of a certain battery cell 30 drops to reach the threshold value, it is determined that the discharge of this battery cell 30 is completed. At this time, the power supply control module 70 controls the first switch structure 441 at this battery cell 30 to close and the second switch structure 442 to open, so as to cut out this discharged battery cell 30 from the circuit and prevent the current of other battery cells 30 from charging this discharged battery cell 30, thus causing current loss. The power supply control module 70 continuously judges the voltage change of each battery cell 30 until all battery cells 30 are discharged. And during the discharge process, when the power supply control module 70 monitors that the voltage information of a certain battery cell 30 is abnormal, it is determined that this battery cell 30 is abnormal or fails. At this time, the power supply control module 70 controls the first switch structure 441 at this battery cell 30 to close and the second switch structure 442 to open, so as to cut out this faulty battery cell 30 from the circuit and interrupt the discharge process of this battery cell 30.

[0116] It can be seen that in this embodiment, by setting the power control module 70, disconnecting the connection line 44, the first switch structure 441, the second switch structure 442, and the voltage measuring device, it is possible to judge the capacity and operating status of each battery unit 30. At the same time, the power control module 70 controls the states of the first switch structure 441 and the second switch structure 442 to control the connection of each battery unit 30 to the circuit and disconnection from the circuit.

[0117] The negative pressure system 50 will be further introduced below.

[0118] As Figure 1 and Figure 2 shown, a check valve 53 is provided at the liquid injection nozzle 33 of each battery unit 30. The negative pressure system 50 includes a pipeline 51, and a plurality of connectors 52 are provided on the pipeline 51. The plurality of connectors 52 are used to be connected to the check valves 53 on the plurality of battery units 30 in a one-to-one correspondence. As described above, when the connector 52 is connected to the check valve 53, the valve core 532 of the check valve 53 can be opened, and then the negative pressure in the pipeline 51 extracts the gas generated inside during the battery module formation.

[0119] As Figure 6 shown, the check valve 53 specifically includes a valve body 531, a valve core 532, and an elastic reset member 533. Among them, the two ends of the valve body 531 are respectively a first opening 5311 and a second opening 5312. The first opening 5311 is communicated with the liquid injection nozzle 33, and the second opening 5312 is used to be connected to the connector 52. Two contraction inclined surfaces are provided at the second opening 5312, and the distance between the two contraction inclined surfaces gradually decreases in the direction from the first opening 5311 to the second opening 5312. The valve core 532 is arranged inside the valve body 531, and the elastic reset member 533 is arranged on the side of the valve core 532 facing the first opening 5311 to abut the valve core 532 against the contraction inclined surface.

[0120] In this check valve 53 structure, when the valve core 532 is not subjected to external force, the electrolyte in the battery unit 30 cannot flow out from the liquid injection nozzle 33, thereby preventing the leakage of the electrolyte.

[0121] As Figure 7 shown, the connector 52 includes a through hole, the through hole is communicated with the pipeline 51, and when the connector 52 is connected to the check valve 53, the through hole is communicated with the second opening 5312. Further, a push rod 521 is also provided on the connector 52. The first end of the push rod 521 can be connected to the inner wall of the through hole through a spoke, so that a space for the medium to pass through is formed between the push rod 521 and the through hole.

[0122] From Figure 7As can be seen, when the joint 52 is connected to the valve body 531, the ejector rod 521 pushes the valve core 532 downward to open it, so that the valve core 532 moves away from the contraction inclined surface. At this time, the pipeline 51, the through hole, the inside of the valve body 531 and the inside of the battery unit 30 are all connected. The gas generated inside the battery unit 30 during the formation process can be extracted by the negative pressure in the pipeline 51. After the formation process is completed, the joint 52 is separated from the valve body 531. At this time, the ejector rod 521 is separated from the valve core 532, and the valve core 532 closes the second opening 5312 again under the action of the elastic reset member 533, thereby preventing the electrolyte in the battery unit 30 from leaking.

[0123] Further, a driving mechanism can be provided at the joint 52. The driving mechanism can drive the joint 52 to move toward the one-way valve 53 or away from the one-way valve 53, so as to realize the docking and separation of the joint 52 and the one-way valve 53.

[0124] Optionally, the driving mechanism can be a driving cylinder, a linear motor, etc.

[0125] In the technical solution of this embodiment, as Figure 1 shown, the energy storage device further includes a liquid injection system 60. The liquid injection system 60 can inject liquid into the battery module through the liquid injection nozzle 33. Specifically, after the battery module is used for charging and discharging for a period of time, a part of the electrolyte will be lost. Therefore, it is necessary to supplement the electrolyte to the battery module through the liquid injection system 60.

[0126] In this embodiment, the liquid injection system 60 and the negative pressure system 50 share the pipeline 51 and the joint 52, that is, the pipeline 51 and the joint 52 serve as both a part of the negative pressure system 50 and a part of the liquid injection system 60.

[0127] As Figure 7 shown in A, when the pipeline 51 and the joint 52 are used as a part of the negative pressure system 50, the pipeline 51 can be externally connected to a vacuum pumping device. Therefore, the inside of the pipeline 51 is under negative pressure, so that the gas in the battery unit 30 can be extracted through the pipeline 51.

[0128] As Figure 7 shown in B, when the pipeline 51 and the joint 52 are used as a part of the liquid injection system 60, the pipeline 51 can be externally connected to a liquid injection device. Therefore, the electrolyte in the pipeline 51 is filled into the battery unit 30 through positive pressure to realize the liquid supplement of the battery unit 30.

[0129] It can be seen that in this embodiment, by setting a set of pipeline 51 and joint 52, the exhaust function of the battery unit 30 during the formation process and the liquid supplement function of the battery unit 30 can be realized at the same time, greatly simplifying the structure of the energy storage device.

[0130] Further, the control method of the above driving mechanism is that when the battery unit 30 needs to be formed and exhausted or replenished with liquid, the driving mechanism controls the connector to be docked with the one-way valve 53, and at other times, the driving mechanism controls the connector to be separated from the one-way valve 53.

[0131] Of course, in some embodiments not shown, the liquid injection system 60 is provided with a separate pipeline and connector, that is, the negative pressure system 50 and the liquid injection system 60 are respectively connected to the one-way valve 53 through separate pipelines and connectors, which is also a feasible embodiment.

[0132] As Figure 1 and Figure 2 shown, in the technical solution of this embodiment, the battery module may further include a plurality of battery packs 100, each battery pack 100 includes a plurality of battery units 30, and different battery packs 100 are arranged in parallel, and the battery units 30 in the same battery pack 100 are connected in series through a third connection line 43.

[0133] As Figure 1 shown, the battery module in this embodiment includes a plurality of battery packs 100, and each battery pack 100 includes four battery units 30. Of course, the number of battery units 30 between different battery packs 100 can be set differently.

[0134] Further, the multiple battery units 30 in a single battery pack 100 are connected in series, and the connection method can refer to the connection method of the above third connection line 43, which will not be elaborated here. And in a single battery pack 100, each battery unit 30 is correspondingly provided with a cut-off connection line 44, a first switch structure 441, a second switch structure 442, and a voltage measuring device.

[0135] In order to arrange the multiple battery packs 100 in parallel, in this embodiment, the first connection line 41 includes a plurality of parallel first branches 411, and the second connection line 42 includes a plurality of parallel second branches 421. As Figure 1 shown, the number of the first branches 411 and the second branches 421 is the same as the number of the battery packs 100. In this embodiment, the battery packs 100 are set to three, so the first branches 411 are correspondingly set to three, and the second branches 421 are also correspondingly set to three.

[0136] As Figure 1 shown, the multiple first branches 411 are respectively adapted to be connected to the first pole columns 31 of the first-end battery units 301 of the multiple battery packs 100, and after the multiple first branches 411 converge (that is, the bus bar of the first connection line 41), they are connected to the inverter 20.

[0137] As Figure 1As shown, a plurality of second branches 421 are respectively adapted to be connected to the second pole columns 32 of the end battery cells 302 of a plurality of battery packs 100, and after the plurality of second branches 421 converge (i.e., the bus bar of the second connection line 42), they are connected to the inverter 20.

[0138] Furthermore, the bus bar of the first connection line 41 and the bus bar of the second connection line 42 form a bus bar loop.

[0139] Furthermore, a power control module 70 is connected to each corresponding first branch 411 and second branch 421 (three power control modules 70 are provided in this embodiment), and the power control module 70 is connected to the voltage measuring devices of each battery cell 30 in the corresponding battery pack 100 to control the corresponding battery pack 100. The specific control content of the power control module 70 in the charge and discharge process of the formation and grading of the battery cell 30 has been described in detail above and will not be elaborated here.

[0140] The following introduces the control process of a plurality of power control modules 70 for a plurality of battery packs 100.

[0141] During the formation and grading process of a plurality of battery packs 100, the battery cells 30 in a certain (or some) battery pack 100 may be cut out of the circuit due to faults or abnormalities, resulting in differences in the total capacity and voltage of each battery pack 100. Through a plurality of power control modules 70, the voltage of each battery pack 100 is stabilized at the bus bar loop voltage, regardless of the number of remaining normal batteries in the battery pack 100.

[0142] During the charging process of the energy storage device, each battery pack 100 is in a parallel mode, and the total charging current is evenly charged into each battery pack 100. After a certain battery pack 100 is fully charged, the power control module 70 corresponding to that battery pack 100 stops working and cuts that battery pack 100 out of the bus bar loop.

[0143] During the discharging process of the energy storage device, each battery pack 100 is in a parallel mode, and the total discharging current is evenly output from each battery pack 100.

[0144] In each of the above processes, if a certain battery pack 100 fails as a whole, the power control module 70 corresponding to that battery pack 100 stops working and cuts that battery pack 100 out of the bus bar loop as a whole, and the other battery packs 100 work normally.

[0145] In each of the above processes, for a certain battery pack 100, if any battery cell 30 fails during the charge and discharge process, the battery cell 30 is isolated by cutting off the connection line 44, and the other battery cells 30 are charged and discharged normally.

[0146] Such as Figure 1As shown in the figure, the pipeline 51 includes a plurality of third branch pipelines 511, and the connectors 52 on the plurality of third branch pipelines 511 are respectively adapted to be connected to the one-way valves 53 on the liquid injection nozzles 33 of the battery cells 30 of the plurality of battery packs 100. Specifically, the number of the third branch pipelines 511 is also the same as the number of the battery packs 100. In this embodiment, the battery packs 100 are set to three, so the third branch pipelines 511 are also set to three, and the three third branch pipelines 511 are respectively connected to the battery cells 30 in the three battery packs 100.

[0147] Furthermore, the number of the connectors 52 on each third branch pipeline 511 is the same as the number of the battery cells 30 in the corresponding battery pack 100. In this embodiment, each battery pack 100 includes four battery cells 30, so four connectors 52 are provided on each third branch pipeline 511.

[0148] The following introduces the specific structure of the box body 10 in this embodiment:

[0149] As Figure 8 shown, the box body 10 includes a box base 11 and a box cover 12 covering the box base 11. The battery module is adapted to be placed in the box base 11, the box cover 12 is adapted to cover above the battery module, and the wiring system 40 and / or the negative pressure system 50 are arranged on the box cover 12.

[0150] Specifically, the box base 11 includes a bottom wall and a side wall, and the bottom wall and the side wall enclose an accommodation space for placing the battery pack 100. The box cover 12 is a plate-like structure, which is used to cover the box base 11, so as to enclose a closed space with the box base 11.

[0151] Furthermore, the wiring system 40 and the negative pressure system 50 in this embodiment are both integrally fixed on the box cover 12. Specifically, each probe of the wiring system 40 and the connector 52 of the negative pressure system 50 are fixed on the box cover 12 through a first positioning structure, and the battery module is fixed in the box base 11 through a second positioning structure during assembly. Therefore, when the box cover 12 covers the box base 11, the relative positions of the above-mentioned probes and connectors 52 and the battery module are unique.

[0152] Taking the battery module including a plurality of battery cells 30 as an example, when the plurality of battery cells 30 are packed in the box and the box cover 12 is covered on the box base 11, the probe at the end of the first connecting wire 41 can be docked with the first pole 31 of the first battery cell 301, the probe at the end of the second connecting wire 42 can be docked with the second pole 32 of the last battery cell 302, the two probes at the end of the third connecting wire 43 can be docked with the first pole 31 and the second pole 32 of the adjacent battery cells 30, and each connector 52 can be docked with the liquid injection nozzle 33 of the corresponding battery cell 30. The above structure enables the connection of the wiring system 40 and the negative pressure system 50 to be completed after the box cover 12 is covered, with simple operation and high efficiency.

[0153] Of course, in some embodiments not shown, the wiring system 40 may not be provided on the cover 12. It is also a feasible embodiment that the operator manually connects each terminal to the first pole 31 and the second pole 32 of the battery unit 30.

[0154] Of course, in some embodiments not shown, the negative pressure system 50 may not be provided on the cover 12. It is also a feasible embodiment that the operator manually connects each joint 52 to the liquid injection nozzle 33 of the battery unit 30.

[0155] Furthermore, as described above, since the negative pressure system 50 and the liquid injection system 60 share the pipeline 51 and the joint 52, in this embodiment, the wiring system 40, the negative pressure system 50, and the liquid injection system 60 are all fixed on the cover 12.

[0156] And further, the above-mentioned driving mechanism can be provided on the cover 12 and connected to the joint 52, so as to realize the telescopic movement of the joint 52 relative to the cover 12, and further realize the docking and separation of the joint 52 and the one-way valve 53.

[0157] Embodiment Two

[0158] As Figure 9 shown, compared with the above-mentioned embodiment, the difference in Embodiment Two of the energy storage device according to the present application is that when there are multiple battery packs 100, the packing method is different from that in Embodiment One.

[0159] As Figure 9 shown, there are multiple battery packs 100 in the battery module. The multiple battery packs 100 are stacked in the box seat 11. There are multiple covers 12, and the cover 12 is used to cover the upper part of the battery pack 100 located below and is used to carry the battery pack 100 located above.

[0160] In Embodiment Two, multiple battery packs 100 are stacked in the box seat 11. Among the multiple covers 12, the cover 12 located in the middle position not only functions to cover the lower battery pack 100 but also has the effect of carrying the upper battery pack 100.

[0161] Furthermore, the above-mentioned first branch 411, second branch 421, third branch 511, third connection line 43, cut-off connection line 44, and joint 52 are correspondingly provided on each cover 12. And in each cover 12, the corresponding relationship between the third connection line 43, the cut-off connection line 44, and the joint 52 and the number of battery units 30 refers to the above content and will not be elaborated here.

[0162] The number of the above-mentioned first branch 411 and second branch 421 is the same as the number of the covers 12. As Figure 4As shown, there are two box covers 12, so both the first branch 411 and the second branch 421 are provided in two. The terminals of the two first branches 411 are respectively connected to the two box covers 12, and are respectively used to connect to the first pole 31 of the first battery unit 301 in the two battery packs 100. The terminals of the two second branches 421 are respectively connected to the two box covers, and are respectively used to connect to the second pole 32 of the last battery unit 302 in the two battery packs 100.

[0163] In the second embodiment, the assembly method of the battery unit 30 is as follows: First, assemble the lowermost battery pack 100 in the box base 11, then cover the box cover 12 and connect the wiring system 40 and the negative pressure system 50; then install the upper battery pack 100 above the box cover 12, cover the box cover 12 and connect the wiring system 40 and the negative pressure system 50; and so on until the uppermost battery pack 100 is installed, and cover the uppermost box cover 12 and connect the wiring system 40 and the negative pressure system 50.

[0164] Embodiment Three

[0165] As Figure 10 shown, the difference between the third embodiment of the energy storage device according to the present application and the above-mentioned second embodiment is that when there are multiple battery packs 100, each battery pack 100 is assembled in a separate box body 10. Specifically, there are multiple box bodies 10, and multiple battery packs 100 are correspondingly arranged in multiple box bodies 10.

[0166] In the third embodiment, each battery pack 100 is correspondingly assembled in a separate box base 11, and a box cover 12 is covered on the box base 11. Each box cover 12 is provided with a first branch 411, a second branch 421 and a third branch 511, as well as third connecting lines 43, cut-off connecting lines 44 and connectors 52 corresponding to the number of battery units 30 in the battery pack 100.

[0167] In the third embodiment, the various box bodies 10 can be stacked, or can be horizontally spaced, or those skilled in the art can adjust the layout of the various box bodies 10 according to actual needs.

[0168] Embodiment Four:

[0169] The difference between the fourth embodiment of the energy storage device according to the present application and the above-mentioned second embodiment is that multiple battery packs 100 are horizontally spaced in the box base 11, rather than being stacked.

[0170] In the fourth embodiment, the box cover 12 can be set in two ways:

[0171] A number of cover lids 12 are provided, and the multiple cover lids 12 are respectively disposed above the multiple battery packs 100 in a one-to-one correspondence. Terminals of a first branch 411 and a second branch 421, as well as third connection lines 43, cut-off connection lines 44 and connectors 52 corresponding to the number of battery cells 30 in the battery pack 100, are provided on each cover lid 12.

[0172] Alternatively, a relatively large cover lid 12 may be provided. The relatively large cover lid 12 is disposed above the multiple battery packs 100 and covers all the battery packs 100. In this embodiment, all the terminals and connectors 52 are provided on the relatively large cover lid 12.

[0173] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. The obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. An energy storage device, characterized in that, Comprising: A box body (10) and an inverter (20), the box body (10) is adapted to accommodate a battery module, the battery module includes a liquid injection nozzle (33), and the inverter (20) is adapted to be connected to a power grid or an electrical device; A wiring system (40), adapted to connect the battery module to the inverter (20), the wiring system (40) includes a first connecting wire (41) and a second connecting wire (42), and a power control module (70) is provided on the first connecting wire (41) and the second connecting wire (42), and the power control module (70) is arranged between the inverter (20) and the battery module; A negative pressure system (50), adapted to generate a negative pressure at the liquid injection nozzle (33); The battery module further includes a first pole (31) and a second pole (32), the first end of the first connecting wire (41) is adapted to be connected to the first pole (31), the first end of the second connecting wire (42) is adapted to be connected to the second pole (32), and the second ends of the first connecting wire (41) and the second connecting wire (42) are both connected to the inverter (20).

2. The energy storage device according to claim 1, wherein The battery module includes a plurality of battery cells (30), the first end of the first connecting wire (41) is adapted to be connected to the first pole (31) of the first battery cell (301) among the plurality of battery cells (30), the first end of the second connecting wire (42) is adapted to be connected to the second pole (32) of the last battery cell (302) among the plurality of battery cells (30), and the wiring system further includes a third connecting wire (43), and the third connecting wire (43) is adapted to connect the first pole (31) and the second pole (32) of adjacent battery cells (30) so that the plurality of battery cells (30) are connected in series.

3. The energy storage device according to claim 1, wherein, The wiring system (40) further includes a cut-off connecting wire (44), both ends of the cut-off connecting wire (44) are adapted to communicate with the first pole (31) and the second pole (32) of the battery cell (30), and a first switch structure (441) is provided on the cut-off connecting wire (44), and a second switch structure (442) is provided at the first pole (31) and / or the second pole (32) of the battery cell (30) in the current loop.

4. The energy storage device according to claim 3, characterized in that, There are a plurality of the cut-off connecting wires (44), and the plurality of cut-off connecting wires (44) are arranged in one-to-one correspondence with the plurality of battery cells (30).

5. The energy storage device according to claim 3, wherein A voltage measuring device is provided at the cut-off connecting wire (44).

6. The energy storage device according to claim 3, wherein Both ends of the cut-off connecting wire (44) are respectively connected to the adjacent third connecting wire (43); or, both ends of the cut-off connecting wire (44) are respectively connected to the third connecting wire (43) and the first connecting wire (41); or, both ends of the cut-off connecting wire (44) are respectively connected to the third connecting wire (43) and the second connecting wire (42).

7. The energy storage device according to claim 3, characterized in that In the non-first-end battery cells (301) and non-last-end battery cells (302) among the multiple battery cells (30), the second switch structure (442) is disposed on the third connection line (43), and is located between the connection point of the cut-off connection line (44) and the third connection line (43) and the first pole (31), and / or between the connection point of the cut-off connection line (44) and the third connection line (43) and the second pole (32); In the first-end battery cell (301), the second switch structure (442) is disposed on the third connection line (43), and is located between the connection point of the cut-off connection line (44) and the third connection line (43) and the second pole (32); and / or, the second switch structure (442) is disposed on the first connection line (41), and is located between the connection point of the cut-off connection line (44) and the first connection line (41) and the first pole (31); In the last-end battery cell (302), the second switch structure (442) is disposed on the third connection line (43), and is located between the connection point of the cut-off connection line (44) and the third connection line (43) and the first pole (31); and / or, the second switch structure (442) is disposed on the second connection line (42), and is located between the connection point of the cut-off connection line (44) and the second connection line (42) and the second pole (32).

8. The energy storage device according to claim 3, characterized in that The multiple battery modules include multiple battery packs (100), each of the battery packs (100) includes multiple battery cells (30), the different battery packs (100) are arranged in parallel, and the battery cells (30) within the same battery pack (100) are connected in series through the third connection line (43).

9. The energy storage device according to claim 8, wherein, The first connection line (41) includes multiple parallel first branches (411), and the multiple first branches (411) are respectively adapted to be connected to the first poles (31) of the first-end battery cells (301) of the multiple battery packs (100); and / or, the second connection line (42) includes multiple parallel second branches (421), and the multiple second branches (421) are respectively adapted to be connected to the second poles (32) of the last-end battery cells (302) of the multiple battery packs (100), and a power control module (70) is provided on the first branch and the second branch corresponding to each battery pack (100).

10. The energy storage device according to any one of claims 1 to 9, characterized in that, The negative pressure system includes a pipeline (51) and connectors (52) all communicating with the pipeline (51), and the multiple connectors (52) are adapted to be connected to the liquid injection nozzles (33) of the battery module.

11. The energy storage device according to claim 10, wherein A one-way valve (53) is provided at the liquid injection nozzle (33). The one-way valve (53) includes a valve body (531) and a valve core (532) disposed within the valve body (531). The valve body (531) has a first opening (5311) and a second opening (5312) that communicate with the liquid injection nozzle (33). The valve core (532) closes the second opening (5312) and is adapted to allow the fluid within the battery module to flow unidirectionally from the first opening (5311) to the second opening (5312). The connector (52) is connected to the valve body (531) and communicates with the second opening (5312), and the connector (52) is adapted to open the second opening (5312).

12. The energy storage device according to claim 11, characterized in that, The one-way valve (53) further includes an elastic reset member (533). The elastic reset member (533) is disposed on a side of the valve core (532) facing the first opening (5311) and abuts the valve core (532) against the second opening (5312). The connector (52) includes a push rod (521). When the connector (52) is connected to the valve body (531), the push rod (521) extends into the second opening (5312) and pushes the valve core (532) to open the second opening (5312).

13. The energy storage device according to claim 10, wherein, The energy storage device further includes a liquid injection system (60). The liquid injection system (60) is adapted to inject liquid into the battery module through the liquid injection nozzle (33).

14. The energy storage device according to claim 13, wherein The negative pressure system (50) and the liquid injection system (60) share the pipeline (51) and the connector (52). The pipeline (51) is adapted to be connected to a vacuum pumping device, or the pipeline (51) is adapted to be connected to a liquid injection device.

15. The energy storage device according to claim 10, characterized in that The battery module includes a plurality of battery cells (30). A plurality of the connectors (52) are provided on the pipeline (51), and the plurality of connectors (52) are respectively connected to the liquid injection nozzles (33) of the plurality of battery cells (30) in a one-to-one correspondence.

16. The energy storage device according to claim 10, wherein, A plurality of battery modules include a plurality of battery packs (100). Each battery pack (100) includes a plurality of battery cells (30). The pipeline (51) includes a plurality of third branches (511), and the connectors (52) on the plurality of third branches (511) are respectively adapted to be connected to the liquid injection nozzles (33) of the battery cells (30) of the plurality of battery packs (100).

17. The energy storage device according to any one of claims 1 to 9, characterized in that, The box body (10) includes a box base (11) and a box cover (12) covering the box base (11). The battery module is adapted to be placed within the box base (11), and the box cover (12) is adapted to be disposed above the battery module. The wiring system (40) and / or the negative pressure system (50) are provided on the box cover (12).

18. The energy storage device according to claim 17, wherein, A plurality of battery modules include a plurality of battery packs (100), each of the battery packs (100) includes a plurality of battery cells (30), the plurality of battery packs (100) are stacked and arranged in the box base (11), there are a plurality of the box covers (12), and the box covers (12) are used to cover above the battery pack (100) located below, and are used to carry the battery pack (100) located above.

19. The energy storage device according to claim 17, wherein, A plurality of battery modules include a plurality of battery packs (100), each of the battery packs (100) includes a plurality of battery cells (30), there are a plurality of the boxes (10), and the plurality of battery packs (100) are correspondingly arranged in the plurality of boxes (10) one by one.

20. The energy storage device according to claim 17, characterized in that, A plurality of battery modules include a plurality of battery packs (100), each of the battery packs (100) includes a plurality of battery cells (30), the plurality of battery packs (100) are horizontally spaced and arranged in the box base (11), there are a plurality of the box covers (12), and the plurality of box covers (12) correspondingly cover above the plurality of battery packs (100) one by one, or, the box cover (12) covers on the plurality of battery packs (100) and covers the plurality of battery packs (100).

Images