Battery cell, battery unit and battery cluster

Abstract

The utility model provides a battery cell, the battery cell is provided with a communication component which enables the inside and the outside of the battery cell to circulate, and the communication component is connected with the battery cell; substances inside the battery cell can be discharged out of the battery cell through the communication component, and substances outside the battery cell can also enter the battery cell through the communication component. The battery cell provided by the utility model is provided with the communication component, electrolyte can not be injected in the production, transportation and assembly processes of the battery cell, and electrolyte is injected into the battery cell after the battery cluster is installed, so that the battery cluster is not electrified in the transportation and installation processes of the battery cluster, and the safety risk of the battery cluster in the transportation and installation processes can be eliminated. The utility model also provides a battery unit and a battery cluster.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery core, a battery unit and a battery cluster. Background Art

[0002] With the development of electronic technology, lithium-ion batteries have been widely used due to their high specific power, long cycle life, good safety performance and no pollution. At present, large-scale energy storage systems are generally composed of multiple battery clusters in parallel to increase the capacity of the energy storage system. The battery cluster is usually composed of a high-voltage control box and multiple battery boxes in series. Multiple battery boxes and high-voltage control boxes are integrated on a battery cluster bracket. The battery box is formed by multiple cells connected in series or in parallel.

[0003] Battery clusters are usually transported to the destination in battery boxes and then assembled on site. During the transportation and assembly process, the battery boxes are charged. The existing battery cluster designs have the following disadvantages:

[0004] 1. Battery boxes are transported while energized, which results in high transportation risks, strict transportation standards, and high transportation costs. 2. When battery boxes are assembled into battery clusters on site, they are assembled while energized, with high voltage and high installation risks. 3. The energy storage system requires multiple battery clusters to be connected in parallel, with many parallel branches, high requirements for battery cell consistency, a large number of high-voltage control boxes, and many high-voltage electrical components, resulting in low system reliability and high costs. 4. Battery clusters are first assembled from battery cells into battery boxes, and then into battery clusters. Battery clusters require many structural parts, which greatly increases the weight of the battery cluster, thereby reducing the energy density of the battery cluster and significantly increasing the cost.

[0005] At the same time, thermal runaway is an important concern in lithium-ion battery design. Battery thermal runaway generally goes through the following four stages:

[0006] 1. The battery cell is damaged, and the temperature and pressure of the battery cell increase;

[0007] 2. As the temperature and pressure of the battery cells increase, flammable gases are generated and discharged from the battery cells;

[0008] 3. The temperature of the battery cell rises rapidly, and the battery cell goes into thermal runaway. The heat of the battery cell that goes into thermal runaway is quickly transferred to other adjacent batteries, causing the other battery cells to also have the risk of thermal runaway;

[0009] 4. If the battery starts to catch fire after thermal runaway, the fire will quickly spread to adjacent batteries and building materials and become uncontrollable.

[0010] The earlier the battery problem is detected in these four stages, the easier it is to quickly control the risk and minimize the loss. At present, mainstream energy storage systems generally control thermal runaway in the fourth stage: a fire protection system is installed in the energy storage system, which includes a smoke alarm system and a gas fire extinguishing system. Only after a thermal runaway fire occurs, the smoke alarm device detects the smoke of the fire and triggers the command to start the gas fire extinguishing system to start the fire extinguishing work. Therefore, the existing fire protection system intervenes late when thermal runaway occurs, the effect is poor, and the fire extinguishing is not thorough, which often causes a larger fire. Utility Model Content

[0011] The purpose of the present application is to provide a battery cell, a battery unit, a battery cluster, a battery cell injection method and a battery cluster injection method. The battery cell has its own connecting parts, and the battery cell does not need to be injected with electrolyte during the production, transportation and assembly process. The battery cell is injected after the battery cluster is installed. Therefore, the battery cluster is not charged during transportation and installation, which can eliminate the safety risks of the battery cluster during transportation and installation.

[0012] An embodiment of the present application provides a battery cell, which is configured with a connecting component that enables circulation between the inside and outside of the battery cell, and the connecting component is connected to the battery cell; substances inside the battery cell can be discharged to the outside of the battery cell through the connecting component, and substances outside the battery cell can also enter the inside of the battery cell through the connecting component.

[0013] In one achievable manner, the connecting component includes an entry component that enables substances outside the battery cell to enter the battery cell and an exit component that enables substances inside the battery cell to be discharged to the outside of the battery cell, and both the entry component and the exit component are connected to the battery cell.

[0014] In one achievable manner, the inlet component and the outlet component are respectively connected to different positions on the battery cell.

[0015] In one achievable manner, the inlet component includes a battery cell inlet pipeline, and the outlet component includes a battery cell outlet pipeline, and the battery cell inlet pipeline and the battery cell outlet pipeline are respectively connected to different positions on the battery cell.

[0016] In one achievable manner, the battery cell inlet pipe is connected to the bottom position of the battery cell, and the battery cell outlet pipe is connected to the top position of the battery cell.

[0017] In one achievable manner, a switch valve and / or a one-way valve is provided on the battery cell inlet pipeline and / or the battery cell outlet pipeline.

[0018] In one feasible manner, a one-way valve is provided on the battery cell entrance pipeline and / or the battery cell discharge pipeline; the one-way valve is provided on the battery cell entrance pipeline at a position close to the battery cell, and / or the one-way valve is provided on the battery cell discharge pipeline at a position close to the battery cell.

[0019] In one achievable manner, a one-way valve is provided on the battery cell inlet pipeline and / or the battery cell outlet pipeline; and the one-way valve is connected to the battery cell via a hose.

[0020] In one achievable manner, at least a portion of the battery cell inlet pipeline is a hose, and / or at least a portion of the battery cell outlet pipeline is a hose.

[0021] In one achievable manner, the connecting component further includes an external pipeline, the external pipeline includes an external inlet pipeline and an external outlet pipeline, the external inlet pipeline is connected to the battery cell inlet pipeline, and the external outlet pipeline is connected to the battery cell outlet pipeline.

[0022] In a feasible manner, a pressure sensor is provided on the external exhaust pipeline.

[0023] In one achievable manner, both the external inlet pipeline and the external outlet pipeline are provided with switches that can be opened and closed.

[0024] In one achievable manner, the external inlet pipe is arranged at the bottom of the battery cell, and the external outlet pipe is arranged at the top of the battery cell.

[0025] Another embodiment of the present application provides a battery unit, comprising at least one of the battery cells described above, wherein the connecting component comprises an entry component and an exit component, the entry component comprises a battery cell entry pipeline, the exit component comprises a battery cell exit pipeline, the battery cell entry pipeline and the battery cell exit pipeline are respectively connected to different positions on the battery cell; the connecting component also comprises an external pipeline, the external pipeline comprises an external entry pipeline and an external exit pipeline, the external entry pipeline is connected to the battery cell entry pipeline, and the external exit pipeline is connected to the battery cell exit pipeline.

[0026] Another embodiment of the present application provides a battery unit, comprising a plurality of the battery cells described above, wherein the connecting component comprises an entry component and an exit component, wherein the entry component comprises a battery cell entry pipeline, and the exit component comprises a battery cell exit pipeline, wherein the battery cell entry pipeline and the battery cell exit pipeline are respectively connected to different positions on the battery cell; the connecting component further comprises an external pipeline, wherein the external pipeline comprises an external entry pipeline and an external exit pipeline, wherein the external entry pipeline is connected to the battery cell entry pipeline, and the external exit pipeline is connected to the battery cell exit pipeline; the battery unit further comprises a battery cell entry main pipeline and a battery cell exit main pipeline, wherein the battery cell entry pipelines on the plurality of battery cells are firstly gathered into the battery cell entry main pipeline and then connected to the external entry pipeline, and the battery cell exit pipelines on the plurality of battery cells are first gathered into the battery cell exit main pipeline and then connected to the external exit pipeline.

[0027] In one achievable manner, the battery unit further includes a protective frame and a bracket, wherein the protective frame and the bracket are respectively arranged at opposite ends of the battery cell, the battery cell discharge pipeline is fixed on the protective frame, and the battery cell inlet pipeline is fixed on the bracket.

[0028] In one achievable manner, at least one first accommodating groove is provided on the protection frame, at least one second accommodating groove is provided on the bracket, and opposite ends of each of the battery cells are respectively located in a corresponding first accommodating groove and a corresponding second accommodating groove.

[0029] In one feasible manner, the protective frame includes a protective plate and a protective cover, the protective plate is connected to the battery cell, the protective cover is connected to the protective plate and is located on a side of the protective plate away from the battery cell, the first accommodating groove is arranged in the protective plate, and the battery cell discharge pipe is fixed on the protective cover.

[0030] In one feasible manner, the bracket includes a tray and a fixed bracket, the tray is connected to the battery cell, the fixed bracket is connected to the tray and is located on a side of the tray away from the battery cell, the second accommodating groove is arranged in the tray, and the battery cell entry pipeline is fixed on the fixed bracket.

[0031] Another embodiment of the present application provides a battery cluster, comprising at least one battery unit as described above.

[0032] In one achievable manner, the battery cluster further includes a battery cluster support, and the battery cells are arranged on the battery cluster support.

[0033] In one feasible manner, the battery cluster bracket includes a bottom support frame and a side connecting frame, the side connecting frame is connected to the bottom support frame and is arranged on at least one side of the battery cluster, the bracket of the battery cell is connected to the bottom support frame, and the protective frame of the battery cell is connected to the side connecting frame.

[0034] In one feasible manner, the number of the side connecting frames is two, and the two side connecting frames are respectively arranged on opposite sides of the battery cluster; the battery cluster bracket also includes two side connecting beams arranged on other opposite sides of the battery cluster, and the two ends of each side connecting beam are respectively connected to the two side connecting frames.

[0035] Another embodiment of the present application provides a battery cell injection method for injecting electrolyte into a battery cell, the method comprising:

[0036] A connecting component is arranged on the battery cell, wherein the connecting component includes an inlet component and an outlet component, wherein the inlet component includes a battery cell inlet pipeline, and the outlet component includes a battery cell outlet pipeline, wherein the battery cell inlet pipeline and the battery cell outlet pipeline are respectively connected to different positions on the battery cell;

[0037] Connecting a liquid injection device to the battery cell inlet pipeline and the battery cell outlet pipeline, injecting electrolyte into the battery cell through the battery cell inlet pipeline by using the liquid injection device, and discharging air and excess electrolyte in the battery cell into the liquid injection device through the battery cell outlet pipeline;

[0038] After the electrolyte is injected, the injection device is disconnected from the battery cell inlet pipeline and the battery cell outlet pipeline.

[0039] Another embodiment of the present application provides a battery cell injection method for injecting coolant into a battery cell that has thermal runaway, the method comprising:

[0040] A connecting component is arranged on the battery cell, wherein the connecting component includes an inlet component and an outlet component, wherein the inlet component includes a battery cell inlet pipeline, and the outlet component includes a battery cell outlet pipeline, wherein the battery cell inlet pipeline and the battery cell outlet pipeline are respectively connected to different positions on the battery cell;

[0041] The external fire-fighting pipeline is connected to the battery cell inlet pipeline and the battery cell outlet pipeline, and the external fire-fighting pipeline is used to inject coolant into the interior of the battery cell through the battery cell inlet pipeline. The coolant inside the battery cell flows back to the external fire-fighting pipeline through the battery cell outlet pipeline, so as to continuously cool the battery cell.

[0042] In one achievable manner, a one-way valve is provided on the battery cell inlet pipeline and / or the battery cell outlet pipeline, and the method further comprises:

[0043] When the electrolyte or the coolant is injected into the battery core, the one-way valve is used to control the one-way flow of the electrolyte or the coolant.

[0044] Another embodiment of the present application provides a battery cluster injection method for injecting electrolyte into a battery cell, the method comprising:

[0045] Assemble at least one battery unit together to form a battery cluster, wherein the battery unit includes at least one battery cell, and the battery cell is provided with a connecting component, wherein the connecting component includes an inlet component and an outlet component, wherein the inlet component includes a battery cell inlet pipeline, and the outlet component includes a battery cell outlet pipeline, wherein the battery cell inlet pipeline and the battery cell outlet pipeline are respectively connected to different positions on the battery cell; the connecting component also includes an external pipeline, wherein the external pipeline includes an external inlet pipeline and an external outlet pipeline, wherein the external inlet pipeline is connected to the battery cell inlet pipeline, and the external outlet pipeline is connected to the battery cell outlet pipeline;

[0046] Connecting a liquid injection device to the external inlet pipeline and the external outlet pipeline, using the liquid injection device to sequentially inject electrolyte into each battery cell of each battery unit through the external inlet pipeline and the battery cell inlet pipeline, and the air and excess electrolyte inside the battery cell are sequentially discharged into the liquid injection device through the battery cell outlet pipeline and the external outlet pipeline;

[0047] After the electrolyte is injected, the injection device is disconnected from the external inlet pipeline and the external outlet pipeline.

[0048] Another embodiment of the present application provides a battery cluster injection method for injecting coolant into a battery cell that has thermal runaway, the method comprising:

[0049] Assemble at least one battery unit together to form a battery cluster, wherein the battery unit includes at least one battery cell, and the battery cell is provided with a connecting component, wherein the connecting component includes an inlet component and an outlet component, wherein the inlet component includes a battery cell inlet pipeline, and the outlet component includes a battery cell outlet pipeline, wherein the battery cell inlet pipeline and the battery cell outlet pipeline are respectively connected to different positions on the battery cell; the connecting component also includes an external pipeline, wherein the external pipeline includes an external inlet pipeline and an external outlet pipeline, wherein the external inlet pipeline is connected to the battery cell inlet pipeline, and the external outlet pipeline is connected to the battery cell outlet pipeline;

[0050] The external fire-fighting pipeline is connected to the external inlet pipeline and the external outlet pipeline, and the external fire-fighting pipeline is used to sequentially inject coolant into the interior of the battery cell experiencing thermal runaway through the external inlet pipeline and the battery cell inlet pipeline, and the coolant inside the battery cell experiencing thermal runaway is sequentially refluxed into the external fire-fighting pipeline through the battery cell outlet pipeline and the external outlet pipeline to continuously cool down the battery cell experiencing thermal runaway.

[0051] In one achievable manner, a one-way valve is provided on the battery cell inlet pipeline and / or the battery cell outlet pipeline, and the method further comprises:

[0052] When the electrolyte or the coolant is injected into the battery core, the one-way valve is used to control the one-way flow of the electrolyte or the coolant.

[0053] The advantages of the battery cell provided in this application are:

[0054] 1. The battery cell has its own connecting parts. The battery cell does not need to be injected with electrolyte during production, transportation and assembly. The battery cell is injected with electrolyte after the battery cluster is installed. Therefore, the battery cell, battery unit or battery cluster is not charged during transportation and installation, which can eliminate the safety risks during transportation and installation.

[0055] 2. The battery cell has its own connecting parts, and the battery cell can add external substances into the battery cell as needed. For example, as the battery circulates for a long time, the electrolyte is gradually consumed so that the remaining amount is insufficient to maintain the entire battery cell's charge and discharge process, affecting the capacity and life of the power battery. In this case, the electrolyte can be added at any time through the built-in connecting parts to maintain the good performance of the battery cell and increase the life of the battery cell. This solves the problem of the battery cell being unable to be maintained and facilitates the later maintenance and management of the battery cell. At the same time, when the battery cell has thermal runaway, fire extinguishing agents, coolants and other substances can be injected into the battery cell through the connecting parts to extinguish the fire and reduce the internal temperature of the battery cell, thereby improving the safety performance of the battery cell.

[0056] 3. The battery cell has its own connecting parts, and the battery cell can discharge the internal substances to the outside as needed. For example, if the battery cell produces gas after a long cycle, causing battery bloating, etc., the gas can be discharged to the outside at any time through the built-in connecting parts to maintain the good performance of the battery cell, increase the life of the battery cell, solve the problem of the battery cell being unable to be maintained, and facilitate the later maintenance and management of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery unit in the embodiment of the present application.

[0058] Figure 2 for Figure 1 Bottom view of .

[0059] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the middle protection frame.

[0060] Figure 4 for Figure 3 Bottom view of .

[0061] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the middle bracket.

[0062] Figure 6 for Figure 5 Bottom view of .

[0063] Figure 7 It is a schematic diagram of the three-dimensional structure of the battery cluster in the embodiment of the present application.

[0064] Figure 8 for Figure 7 Schematic diagram of the explosion structure.

[0065] Fig. 9 Schematic diagram of the flow direction of the electrolyte when the electrolyte is injected into the battery cell in the embodiment of the present application.

[0066] Fig.10 Schematic diagram of the flow direction of the coolant when the coolant is injected into the battery cell in the embodiment of the present application.

[0067] Fig.11 FIG. 1 is a schematic diagram of a three-dimensional structure of a battery cluster in another embodiment of the present application.

[0068] In the figure, 1-battery unit, 11-battery core, 111-liquid injection hole, 12-protection frame, 121-first accommodating groove, 122-protection plate, 123-protection cover, 124-first through hole, 13-bracket, 131-second accommodating groove, 132-tray, 133-fixing bracket, 134-second through hole, 135-accommodating chamber, 141-battery core inlet pipeline, 142-battery core outlet pipeline, 143-battery core inlet main pipeline, 144-battery core outlet main pipeline, 145-switch valve, 15-external pipeline, 151-external inlet pipeline, 152-external Exhaust pipeline, 153-switch, 154-first plug, 155-first external branch, 156-second external branch, 157-pressure sensor, 15a-interface, 16-temperature and pressure collection wiring harness, 17-check valve, 18-first electrical connector, 191-second plug, 192-fixing buckle, 2-battery cluster bracket, 21-bottom support frame, 22-side connecting frame, 23-side connecting beam, 3-pipe clamp, 4-second electrical connector, 5-battery management unit, 51-mounting frame, 6-insulating column, 7-liquid injection device, 8-external fire protection pipeline. DETAILED DESCRIPTION

[0069] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0070] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present application are used to distinguish similar objects and not necessarily to describe a particular sequence or order.

[0071] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of this application are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection requested by this application.

[0072] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a battery cell 11, and the battery cell 11 is provided with a connecting component for allowing the inside and outside of the battery cell 11 to circulate, and the connecting component is connected to the battery cell 11. The substances inside the battery cell 11 can be discharged to the outside of the battery cell 11 through the connecting component, and the substances outside the battery cell 11 can also enter the inside of the battery cell 11 through the connecting component.

[0073] Specifically, the functions of the connecting component can be: 1. When injecting electrolyte into the battery cell 11, the electrolyte can enter the battery cell 11 through the connecting component, and the air and excess electrolyte inside the battery cell 11 can be discharged to the outside of the battery cell 11 through the connecting component; 2. When a side reaction occurs inside the battery cell 11 to generate gas, it can be discharged to the outside of the battery cell 11 through the connecting component; 3. When the battery cell 11 has a thermal runaway fire, a fire extinguishing agent or coolant can be injected into the battery cell 11 through the connecting component, and the heat, flame, and combustible gas generated inside the battery cell 11 can be discharged to the outside of the battery cell 11 through the connecting component. Of course, the connecting component can also be used for other purposes.

[0074] As an embodiment, the connecting component includes an entry component that allows substances outside the battery cell 11 to enter the battery cell 11 and an exit component that allows substances inside the battery cell 11 to be discharged to the outside of the battery cell 11, and both the entry component and the exit component are connected to the battery cell 11.

[0075] As an implementation mode, the inlet component and the outlet component are respectively connected to different positions on the battery cell 11 .

[0076] like Figure 1 and Figure 2As shown, as an implementation mode, the inlet component includes a battery cell inlet pipeline 141 , and the outlet component includes a battery cell outlet pipeline 142 . The battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11 .

[0077] like Figure 1 and Figure 2 As shown, as an implementation mode, the battery cell inlet pipe 141 is connected to the bottom position of the battery cell 11 , and the battery cell outlet pipe 142 is connected to the top position of the battery cell 11 .

[0078] like Figure 1 and Figure 2 As shown, as an implementation, a one-way valve 17 is provided on the battery cell inlet pipeline 141 and / or the battery cell outlet pipeline 142. The one-way valve 17 can be a one-way solenoid valve, or a common straight-through or right-angle one-way valve.

[0079] Specifically, the present application sets a one-way valve 17 on the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142, adopts a one-way flow design of electrolyte when filling electrolyte into the battery cell 11, strictly controls the flow direction of electrolyte during the electrolyte filling process, and ensures the stability and consistency of the electrolyte capacity in each battery cell 11 after the electrolyte filling is completed. The one-way valve 17 on the battery cell inlet pipeline 141 only allows the electrolyte to flow from the battery cell inlet pipeline 141 into the battery cell 11, and the one-way valve 17 on the battery cell discharge pipeline 142 only allows the electrolyte and gas to flow out of the battery cell 11 to the battery cell discharge pipeline 142; when the coolant is injected into the battery cell 11, the one-way valve 17 on the battery cell inlet pipeline 141 only allows the coolant to flow from the battery cell inlet pipeline 141 into the battery cell 11, and the one-way valve 17 on the battery cell discharge pipeline 142 only allows the heat, flame and combustible gas generated inside the battery cell 11 to flow out to the battery cell discharge pipeline 142 without backflow.

[0080] like Figure 1 and Figure 2 As shown, as an embodiment, the one-way valve 17 is arranged on the battery cell inlet pipeline 141 close to the battery cell 11 , and / or the one-way valve 17 is arranged on the battery cell outlet pipeline 142 close to the battery cell 11 .

[0081] As an implementation mode, the one-way valve 17 and the battery cell 11 are connected via a hose (not shown).

[0082] like Figure 1 and Figure 2 As shown, as an embodiment, at least a portion of the battery cell inlet pipe 141 is a hose, and / or at least a portion of the battery cell outlet pipe 142 is a hose.

[0083] Specifically, the battery cell inlet pipe 141 and the battery cell outlet pipe 142 can be entirely a hose, or a combination of a hard pipe and a hose (i.e., a portion of the battery cell inlet pipe 141 and the battery cell outlet pipe 142 is a hose, and the other portion is a hard pipe). The present application adopts a hose connection design, and since the hose connection design has low assembly precision requirements, it can effectively eliminate design and assembly tolerances, facilitate automated installation of the pipe, and improve the reliability of the pipe design.

[0084] like Figure 2 and Figure 6 As shown, as an implementation mode, a switch valve 145 is provided on the battery cell inlet pipeline 141 and / or the battery cell outlet pipeline 142 .

[0085] Specifically, the switch valves 145 on the battery cell inlet pipelines 141 of each battery cell 11 are independent of each other and do not affect each other. The switch valves 145 are in a normally closed state and can be independently opened and closed as needed to allow the electrolyte or coolant to enter one or more single battery cells 11 separately without affecting other battery cells 11.

[0086] As an embodiment, when injecting electrolyte into the battery cell 11, the switch valve 145 may be a manual valve, a solenoid valve, etc. As another embodiment, when injecting coolant into the battery cell 11, the switch valve 145 may be a solenoid valve, etc. (the manual valve does not have the function of automatic opening and closing).

[0087] like Figure 7 and Figure 8 As shown, as an embodiment, the connecting component also includes an external pipeline 15, and the external pipeline 15 includes an external inlet pipeline 151 and an external outlet pipeline 152, the external inlet pipeline 151 is connected to the battery cell inlet pipeline 141, and the external outlet pipeline 152 is connected to the battery cell outlet pipeline 142.

[0088] like Fig.11As shown, as another embodiment, a pressure sensor 157 is provided on the external discharge pipeline 152 to monitor the pressure change in the external discharge pipeline 152. When the battery cell 11 has thermal runaway, the temperature and pressure in the battery cell 11 increase and gas is generated and discharged from the battery cell 11. The gas enters the external discharge pipeline 152 after passing through the battery cell discharge pipeline 142; the pressure sensor 157 located on the external discharge pipeline 152 can quickly detect the increase in pressure in the pipe and issue an alarm, and at the same time, the temperature sensor (not shown) located on the battery cell 11 can detect the increase in the temperature of the battery cell 11 monomer, thereby determining the battery cell 11 monomer that has thermal runaway. According to the battery cell 11 monomer that has been determined to have thermal runaway, the switch valve 145 connected to the battery cell 11 monomer is opened, and the coolant flows from the external pipeline through the lower pipeline into the battery monomer to cool the battery monomer. The coolant enters the battery cell 11 through the external inlet pipeline 151 and the battery cell inlet pipeline 141 in turn to cool it, and then passes through the battery cell discharge pipeline 142 and the external discharge pipeline 152 in turn to be discharged to the outside of the battery cell 11. The coolant continuously flows into and out of the battery cell 11, thereby continuously cooling the battery cell 11 monomer.

[0089] like Figure 7 and Figure 8 As shown, as an implementation mode, both the external inlet pipeline 151 and the external outlet pipeline 152 are provided with a switch 153 that can be opened and closed.

[0090] like Figure 7 and Figure 8 As shown in FIG. 1 , as an embodiment, when the electrolyte is injected into the battery cell 11 , the switch 153 that can be opened and closed can be a manual valve, a solenoid valve, a one-way valve, etc. Fig.11 As shown, as another embodiment, when the coolant is injected into the battery cell 11, the switch 153 that can be opened and closed can be a solenoid valve, a one-way valve, etc. (the manual valve does not have the function of automatic opening and closing).

[0091] like Figure 7 and Figure 8 As shown in FIG. 1 , as an embodiment, both the external inlet pipeline 151 and the external outlet pipeline 152 have an interface 15a, and the switch 153 is disposed at the interface 15a of the external inlet pipeline 151 and the interface 15a of the external outlet pipeline 152. When electrolyte is added to the battery cell 11, the interface 15a on the external inlet pipeline 151 and the external outlet pipeline 152 is connected to the injection device 7 (for the injection device 7, please refer to FIG. 1 ). Fig. 9 ), the interface 15a on the external inlet pipeline 151 and the external outlet pipeline 152 is sealed by setting a first plug 154 when no liquid is injected; of course, after the injection is completed, the interface 15a on the external inlet pipeline 151 and the external outlet pipeline 152 can also be connected to the external fire-fighting pipeline 8 (for the external fire-fighting pipeline 8, please refer to Fig.10) to inject coolant into the battery cell 11 through the external fire-fighting pipeline 8 after the battery cell 11 has thermal runaway.

[0092] Specifically, the present application adopts a double sealing design of a switch 153 and a first plug 154, thereby effectively ensuring the sealing performance of the external inlet pipeline 151 and the external outlet pipeline 152. When filling the electrolyte, first unscrew the first plug 154, then connect the injection device 7 to the interface 15a of the external inlet pipeline 151 and the external outlet pipeline 152, and then turn on the switch 153 to inject the electrolyte; after the electrolyte is filled, first turn off the switch 153, then disconnect the injection device 7 from the interface 15a, and finally install the first plug 154.

[0093] like Figure 7 and Figure 8 As shown, as an implementation mode, the external inlet pipe 151 is arranged at the bottom of the battery cell 11 , and the external outlet pipe 152 is arranged at the top of the battery cell 11 .

[0094] The embodiment of the present application also provides a battery unit 1, comprising at least one battery cell 11 described above. The connecting component comprises an inlet component and an outlet component, the inlet component comprises a battery cell inlet pipeline 141, the outlet component comprises a battery cell outlet pipeline 142, the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11. The connecting component also comprises an external pipeline 15, the external pipeline 15 comprises an external inlet pipeline 151 and an external outlet pipeline 152, the external inlet pipeline 151 is connected to the battery cell inlet pipeline 141, and the external outlet pipeline 152 is connected to the battery cell outlet pipeline 142.

[0095] like Figure 1 , Figure 2 and Figure 7 As shown, another embodiment of the present application further provides a battery unit 1, comprising a plurality of the above-mentioned battery cells 11. The connecting component comprises an inlet component and an outlet component, the inlet component comprises a battery cell inlet pipeline 141, the outlet component comprises a battery cell outlet pipeline 142, the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11. The connecting component also comprises an external pipeline 15, the external pipeline 15 comprises an external inlet pipeline 151 and an external outlet pipeline 152, the external inlet pipeline 151 is connected to the battery cell inlet pipeline 141, and the external outlet pipeline 152 is connected to the battery cell outlet pipeline 142. The battery unit 1 also includes a battery cell inlet main pipeline 143 and a battery cell outlet main pipeline 144. The battery cell inlet pipelines 141 on multiple battery cells 11 are first converged into the battery cell inlet main pipeline 143 and then connected to the external inlet pipeline 151. The battery cell outlet pipelines 142 on multiple battery cells 11 are first converged into the battery cell outlet main pipeline 144 and then connected to the external outlet pipeline 152.

[0096] like Figure 7 and Figure 8 As shown, as an embodiment, the external pipeline 15 also includes a first external branch pipe 155 and a second external branch pipe 156, one end of each first external branch pipe 155 is connected to a corresponding battery cell entry main pipeline 143 of the battery unit 1, and the other end of each first external branch pipe 155 is connected to the external entry pipeline 151; one end of each second external branch pipe 156 is connected to a corresponding battery cell discharge main pipeline 144 of the battery unit 1, and the other end of each second external branch pipe 156 is connected to the external discharge pipeline 152.

[0097] like Figure 7 and Figure 8 As shown, as an embodiment, the first external branch pipe 155 and / or the second external branch pipe 156 are hoses.

[0098] Specifically, Figures 7 to 9 As shown, when the electrolyte is injected into the battery cell 11, the electrolyte flows out of the injection device 7 and is injected into the battery cell 11 through the external inlet pipe 151 and the battery cell inlet pipe 141 in sequence, and the air and excess electrolyte in the battery cell 11 are discharged to the outside of the battery cell 11 through the battery cell discharge pipe 142 and the external discharge pipe 152 in sequence and return to the injection device 7. Figure 7 and Fig.10 As shown, when coolant is injected into the battery cell 11 that has thermal runaway, the coolant flows out of the external fire-fighting pipeline 8, and is injected into the battery cell 11 through the external inlet pipeline 151 and the battery cell inlet pipeline 141 in sequence. The coolant and combustible gas and other substances inside the battery cell 11 are discharged to the outside of the battery cell 11 through the battery cell discharge pipeline 142 and the external discharge pipeline 152 in sequence and return to the external fire-fighting pipeline 8.

[0099] like Figure 1 and Figure 2 As shown, as an embodiment, the battery cell entry main pipeline 143 and the battery cell discharge main pipeline 144 are open at both ends, so as to facilitate connection with the external entry pipeline 151 and the external discharge pipeline 152. After one end of the battery cell entry main pipeline 143 is connected to the external entry pipeline 151, the other end of the battery cell entry main pipeline 143 is sealed with a second plug 191; after one end of the battery cell discharge main pipeline 144 is connected to the external discharge pipeline 152, the other end of the battery cell discharge main pipeline 144 is sealed with a second plug 191.

[0100] like Figure 1 and Figure 2As shown, as an embodiment, the battery unit 1 also includes a protective frame 12 and a bracket 13, which are respectively arranged at opposite ends of the battery cell 11, and the battery cell discharge pipeline 142 is fixed to the protective frame 12 by a fixing buckle 192, and the battery cell inlet pipeline 141 is fixed to the bracket 13 by a fixing buckle 192.

[0101] like Figure 4 and Figure 5 As shown, as an embodiment, at least one first receiving groove 121 is provided on the protection frame 12, and at least one second receiving groove 131 is provided on the bracket 13. The opposite ends of each battery cell 11 are respectively located in a corresponding first receiving groove 121 and a corresponding second receiving groove 131, thereby facilitating the positioning and installation of the battery cell 11.

[0102] like Figure 4 and Figure 5 As shown, as an embodiment, the number of the first receiving grooves 121 and the number of the second receiving grooves 131 are both multiple, the multiple first receiving grooves 121 are arranged at intervals on the protection frame 12, and the multiple second receiving grooves 131 are arranged at intervals on the bracket 13.

[0103] like Figure 1 and Figure 2 As shown, as an embodiment, the battery cell 11 is extended in the vertical direction, that is, the battery cell 11 is placed vertically, and the injection hole 111 of the battery cell 11, the electrode (not shown) and other components are arranged at the upper and lower ends of the battery cell 11. The protection frame 12 is arranged above the battery cell 11, and the protection frame 12 is fixed to the top of the battery cell 11. The bracket 13 is arranged below the battery cell 11, and the bracket 13 is fixed to the bottom of the battery cell 11. The battery cell discharge pipeline 142 is connected to the injection hole 111 at the top of the battery cell 11, and the battery cell inlet pipeline 141 is connected to the injection hole 111 at the bottom of the battery cell 11. When the battery cell 11 is injected, the electrolyte flows into the battery cell 11 from the injection hole 111 at the bottom of the battery cell 11 through the battery cell inlet pipeline 141, and the excess electrolyte and gas in the battery cell 11 are discharged from the injection hole 111 at the top of the battery cell 11 through the battery cell discharge pipeline 142.

[0104] Specifically, the bracket 13 mainly bears the weight (i.e., bears the weight of the battery cell 11), and protects the electrodes, copper bars, wiring harnesses, and injection pipelines at the bottom of the battery cell 11. The protection frame 12 mainly protects the electrodes, copper bars, wiring harnesses, and injection pipelines at the top of the battery cell 11. The protection frame 12 and the bracket 13 cooperate with each other to fix the battery cell 11, thereby facilitating the subsequent installation and fixation of the battery cell 11.

[0105] like Figure 3 and Figure 4As shown, as an embodiment, the protection frame 12 includes a protection plate 122 and a protection cover 123, the protection plate 122 is connected to the battery cell 11, the protection cover 123 is connected to the protection plate 122 and is located on the side of the protection plate 122 away from the battery cell 11, the first accommodating groove 121 is arranged in the protection plate 122, and the battery cell discharge pipe 142 is fixed on the protection cover 123.

[0106] like Figure 5 and Figure 6 As shown, as an embodiment, the bracket 13 includes a tray 132 and a fixed bracket 133, the tray 132 is connected to the battery cell 11, the fixed bracket 133 is connected to the tray 132 and is located on the side of the tray 132 away from the battery cell 11, the second accommodating groove 131 is arranged in the tray 132, and the battery cell entry pipe 141 is fixed on the fixed bracket 133.

[0107] As an implementation manner, the protection plate 122 and the tray 132 are both made of insulating material.

[0108] Specifically, the main functions of the fixing bracket 133 include: 1. Providing structural strength for the battery unit 1 and bearing the weight of the battery cell 11 and accessories; 2. Being used to connect the battery unit 1 to the battery cluster bracket 2 (the battery cluster bracket 2 is described in detail below); 3. Protecting components such as electrodes, copper bars, wiring harnesses and injection pipelines. The protective cover 123 mainly provides structural strength for the protective frame 12, and facilitates the fixed connection between the protective frame 12 and the side connecting frame 22 (the side connecting frame 22 is described in detail below). The protective plate 122 and the tray 132 mainly play the role of insulation, and at the same time position and fix the battery cell 11. In other embodiments, the protective plate 122 and the protective cover 123 can also be integrated into an integrated structure, and the tray 132 and the fixing bracket 133 can also be integrated into an integrated structure.

[0109] like Figure 3 and Figure 4 As shown in FIG. 1 , as an embodiment, the protection frame 12 is provided with a first through hole 124, and the battery discharge pipe 142 is located above the protection frame 12. The battery discharge pipe 142 passes through the first through hole 124 and is connected to the top of the battery 11. Figure 5 and Figure 6 As shown, a second through hole 134 is provided on the bracket 13 , a receiving cavity 135 is provided in the bracket 13 , a battery cell entry pipe 141 is located in the receiving cavity 135 , and the battery cell entry pipe 141 passes through the second through hole 134 and is connected to the bottom of the battery cell 11 .

[0110] like Figure 7 and Figure 8 As shown, an embodiment of the present application further provides a battery cluster, comprising at least one battery unit 1 described above.

[0111] like Figure 7 and Figure 8 As shown, as an embodiment, the battery cluster further includes a battery cluster support 2 , and the battery cells 1 are arranged on the battery cluster support 2 .

[0112] like Figure 7 and Figure 8 As shown, as an embodiment, the battery cluster support 2 includes a bottom support frame 21 and a side connection frame 22, the bottom support frame 21 is arranged below the battery unit 1, and the side connection frame 22 is fixedly connected to the bottom support frame 21 and arranged on at least one side of the battery cluster. The bracket 13 of each battery unit 1 is fixedly connected to the bottom support frame 21, the protection frame 12 of each battery unit 1 is fixedly connected to the side connection frame 22, and the external inlet pipe 151 and the external outlet pipe 152 are both fixed on the side connection frame 22.

[0113] like Figure 7 and Figure 8 As shown, as an embodiment, the bracket 13 is fixedly connected to the bottom support frame 21 by positioning pins and / or bolts, and the protection frame 12 is fixedly connected to the side connection frame 22 by bolts, so that the battery cell 11 is firmly fixed on the battery cluster support 2. The external inlet pipe 151 and the external outlet pipe 152 are fixed to the side connection frame 22 by pipe clamps 3.

[0114] like Figure 7 and Figure 8 As shown, as an embodiment, there are two side connecting frames 22, and the two side connecting frames 22 are respectively arranged on opposite sides of the battery cluster. The battery cluster support 2 also includes two side connecting beams 23 arranged on the other opposite sides of the battery cluster, and the two ends of each side connecting beam 23 are respectively connected to the two side connecting frames 22.

[0115] like Figure 1 , Figure 2 and Figure 7 As shown in FIG. 1 , as an embodiment, two adjacent battery cells 11 in each battery unit 1 are connected in series via a first electrical connector 18 . Figure 7 and Figure 8 As shown, two adjacent battery cells 1 in each battery cluster are connected in series via a second electrical connector 4, and the second electrical connector 4 is separated from the protection frame 12 by an insulating column 6. The battery cluster further includes a temperature and pressure sampling harness 16, which is connected to the first electrical connector 18 and the second electrical connector 4, and is used to sample the temperature and voltage of the battery cell 11.

[0116] As an implementation manner, the first electrical connector 18 and the second electrical connector 4 are both copper bars. Of course, the first electrical connector 18 and the second electrical connector 4 may also be wire harnesses or other electrical connectors.

[0117] like Figure 7 and Figure 8 As shown, as an embodiment, the battery cluster further includes a battery management unit 5 (LECU) and a mounting frame 51, the battery management unit 5 is mounted on the mounting frame 51, and the mounting frame 51 is fixed on the battery cluster bracket 2. The battery management unit 5 is connected to the first electrical connector 18 and the second electrical connector 4 through the temperature and pressure collection harness 16. The battery management unit 5 is used to manage each battery cell 1 in the battery cluster, is responsible for collecting and balancing the voltage and temperature of each battery cell 11 in the battery cell 1, and is also used to communicate with other battery clusters in the battery system and the upper-level processing system.

[0118] As an implementation mode, the number of battery cells 11 in each battery unit 1 and the number of battery units 1 in each battery cluster can be flexibly configured according to the requirements of voltage and capacity.

[0119] The present application also provides a battery cell injection method for injecting electrolyte into the battery cell 11. The battery cell injection method includes:

[0120] A connecting component is provided on the battery cell 11, and the connecting component includes an inlet component and an outlet component, the inlet component includes a battery cell inlet pipeline 141, and the outlet component includes a battery cell outlet pipeline 142, and the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11;

[0121] The liquid injection device 7 is connected to the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142, and the electrolyte is injected into the battery cell 11 through the battery cell inlet pipeline 141 by the liquid injection device 7, and the air and excess electrolyte in the battery cell 11 are discharged into the liquid injection device 7 through the battery cell outlet pipeline 142;

[0122] After the electrolyte is injected, the injection device 7 is disconnected from the battery cell inlet pipe 141 and the battery cell outlet pipe 142 .

[0123] As an embodiment, a one-way valve 17 is provided on the battery cell inlet pipeline 141 and / or the battery cell outlet pipeline 142, and the battery cell injection method further includes:

[0124] When the electrolyte is injected into the battery cell 11 , the one-way flow of the electrolyte is controlled by the one-way valve 17 .

[0125] The present application also provides a battery cell injection method for injecting coolant into a battery cell 11 that has thermal runaway. The battery cell injection method includes:

[0126] A connecting component is provided on the battery cell 11, and the connecting component includes an inlet component and an outlet component, the inlet component includes a battery cell inlet pipeline 141, and the outlet component includes a battery cell outlet pipeline 142, and the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11;

[0127] The external fire-fighting pipeline 8 is connected to the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142, and the external fire-fighting pipeline 8 is used to inject coolant into the battery cell 11 through the battery cell inlet pipeline 141, and the coolant in the battery cell 11 flows back to the external fire-fighting pipeline 8 through the battery cell outlet pipeline 142, so as to continuously cool the battery cell 11;

[0128] After the battery cell 11 is cooled down, the external fire-fighting pipeline 8 is disconnected from the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142, or the external fire-fighting pipeline 8 is not disconnected from the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 to continue using the external fire-fighting pipeline 8 to cool down the battery cell 11 that has thermal runaway.

[0129] As an embodiment, a one-way valve 17 is provided on the battery cell inlet pipeline 141 and / or the battery cell outlet pipeline 142, and the battery cell injection method further includes:

[0130] When the coolant is injected into the battery cell 11 , the one-way valve 17 is used to control the one-way flow of the coolant.

[0131] The present application also provides a battery cluster injection method for injecting electrolyte into the battery cell 11. The battery cluster injection method includes:

[0132] At least one battery unit 1 is assembled together to form a battery cluster, wherein the battery unit 1 includes at least one battery cell 11, and a connecting component is provided on the battery cell 11, wherein the connecting component includes an inlet component and an outlet component, wherein the inlet component includes a battery cell inlet pipeline 141, and the outlet component includes a battery cell outlet pipeline 142, wherein the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11; the connecting component also includes an external pipeline 15, wherein the external pipeline 15 includes an external inlet pipeline 151 and an external outlet pipeline 152, wherein the external inlet pipeline 151 is connected to the battery cell inlet pipeline 141, and the external outlet pipeline 152 is connected to the battery cell outlet pipeline 142;

[0133] The liquid injection device 7 is connected to the external inlet pipeline 151 and the external outlet pipeline 152, and the electrolyte is injected into each battery cell 11 of each battery unit 1 through the external inlet pipeline 151 and the battery cell inlet pipeline 141 in sequence by the liquid injection device 7, and the air and excess electrolyte in the battery cell 11 are discharged into the liquid injection device 7 through the battery cell outlet pipeline 142 and the external outlet pipeline 152 in sequence;

[0134] After the electrolyte injection is completed, the injection device 7 is disconnected from the external inlet pipe 151 and the external outlet pipe 152 .

[0135] As an embodiment, a one-way valve 17 is provided on the battery cell inlet pipe 141 and / or the battery cell outlet pipe 142. The battery cluster injection method further includes:

[0136] When the electrolyte is injected into the battery cell 11 , the one-way flow of the electrolyte is controlled by the one-way valve 17 .

[0137] The present application also provides a battery cluster injection method for injecting coolant into a battery cell 11 that has thermal runaway. The battery cluster injection method includes:

[0138] At least one battery unit 1 is assembled together to form a battery cluster, wherein the battery unit 1 includes at least one battery cell 11, and a connecting component is provided on the battery cell 11, wherein the connecting component includes an inlet component and an outlet component, wherein the inlet component includes a battery cell inlet pipeline 141, and the outlet component includes a battery cell outlet pipeline 142, wherein the battery cell inlet pipeline 141 and the battery cell outlet pipeline 142 are respectively connected to different positions on the battery cell 11; the connecting component also includes an external pipeline 15, wherein the external pipeline 15 includes an external inlet pipeline 151 and an external outlet pipeline 152, wherein the external inlet pipeline 151 is connected to the battery cell inlet pipeline 141, and the external outlet pipeline 152 is connected to the battery cell outlet pipeline 142;

[0139] The external fire-fighting pipeline 8 is connected to the external inlet pipeline 151 and the external outlet pipeline 152, and the external fire-fighting pipeline 8 is used to sequentially inject coolant into the battery cell 11 that has thermal runaway through the external inlet pipeline 151 and the battery cell inlet pipeline 141, and the coolant inside the battery cell 11 that has thermal runaway flows back to the external fire-fighting pipeline 8 through the battery cell outlet pipeline 142 and the external outlet pipeline 152 in turn, so as to continuously cool down the battery cell 11 that has thermal runaway;

[0140] After the battery cell 11 experiencing thermal runaway is cooled down, the external fire-fighting pipeline 8 is disconnected from the external inlet pipeline 151 and the external outlet pipeline 152, or the external fire-fighting pipeline 8 is not disconnected from the external inlet pipeline 151 and the external outlet pipeline 152 to continue using the external fire-fighting pipeline 8 to cool down the battery cell 11 experiencing thermal runaway.

[0141] As an embodiment, a one-way valve 17 is provided on the battery cell inlet pipe 141 and / or the battery cell outlet pipe 142. The battery cluster injection method further includes:

[0142] When the coolant is injected into the battery cell 11 that has thermal runaway, the one-way valve 17 is used to control the one-way flow of the coolant.

[0143] The advantages of the battery cell 11, the battery unit 1 and the battery cluster provided by the embodiments of the present application are:

[0144] 1. In the present application, the battery cell 11 is provided with a battery cell inlet pipe 141 and a battery cell outlet pipe 142. The battery cell 11 is not injected with electrolyte during production, transportation and assembly. The battery cell 11 is injected with electrolyte after the battery cluster is installed. Therefore, the battery cell, battery unit or battery cluster is not charged during transportation and installation, which can eliminate safety risks during transportation and installation.

[0145] 2. Since the battery cells 11 are not injected with electrolyte and the battery cluster is not charged during transportation and installation of the battery cluster, the battery cluster can be transported as a whole, that is, the battery cluster is transported to the site after being assembled, eliminating the on-site assembly of the battery cluster and improving transportation safety and convenience; at the same time, only the battery clusters are assembled on site, and the battery clusters are injected after being assembled on site to form a battery system, so the on-site installation is safe and convenient;

[0146] 3. The battery cell 11 is provided with a battery cell inlet pipe 141 and a battery cell outlet pipe 142. The battery cell 11 can be filled with electrolyte as needed to maintain good performance of the battery cell 11 and improve the life of the battery cell 11, thereby solving the problem that the battery cell 11 cannot be maintained and facilitating the later maintenance and management of the battery cell 11;

[0147] 4. A pressure sensor 157 is provided on the external discharge pipeline 152 to monitor the pressure change in the external discharge pipeline 152, so as to detect and quickly intervene to control the thermal runaway in the second stage of thermal runaway, so as to control the thermal runaway more quickly and efficiently; at the same time, the battery cell inlet pipeline 141 and the battery cell discharge pipeline 142 are directly connected to the battery cell 11. When the battery cell 11 has thermal runaway, the coolant can be quickly injected into the battery cell 11 through the battery cell inlet pipeline 141, and the heat, flame and combustible gas generated inside the battery cell 11 can be quickly discharged to the outside of the battery cell 11 through the battery cell discharge pipeline 142, so as to extinguish the fire and reduce the internal temperature of the battery cell 11, so as to prevent the battery cell 11 with thermal runaway from deteriorating to the next stage, thereby improving the safety performance of the battery cell 11;

[0148] 5. A switch valve 145 is provided on the cell inlet pipeline 141. The switch valves 145 on the cell inlet pipelines 141 of the various cells 11 are independent of each other and do not affect each other. The switch valves 145 can be opened and closed independently as needed to allow the coolant to enter one or more of the single cells 11 separately without affecting other cells 11, thereby reducing cost losses.

[0149] 6. This application adopts a hose connection design. Since the hose connection design has low assembly precision requirements, it can effectively eliminate design and assembly tolerances, facilitate automated pipeline installation, and improve pipeline design reliability;

[0150] 7. The present application adopts a double sealing design of the switch 153 and the first plug 154, thereby effectively ensuring the sealing performance of the external inlet pipeline 151 and the external outlet pipeline 152;

[0151] 8. The present application provides a one-way valve 17 on the cell inlet pipe 141 and the cell outlet pipe 142, i.e., adopts a one-way flow design of the electrolyte, strictly controls the flow direction of the electrolyte during the electrolyte filling process, and ensures the stability and consistency of the electrolyte capacity in each cell 11 after the electrolyte filling is completed;

[0152] 9. The battery unit 1 in the present application is assembled by a battery cell 11, a protective frame 12 and a bracket 13, and the battery cell 11 is not injected with electrolyte during the production, transportation and assembly process. The volume and capacity of the battery cell 11 can be set larger, and the number of battery cells 11 is small, so the multi-parallel branches of the battery system can be reduced or eliminated, and the battery box level is omitted (that is, no battery box is required). At the same time, after the battery cells 1 are assembled to form a battery cluster, there is no need to set a high-voltage control box in the battery cluster, thereby greatly reducing the number of electrical components and structural components, improving the energy density of the battery cell 1 and the battery cluster and the reliability of the system operation, and reducing the cost; moreover, the distance between the battery cells 11 in the battery cell 1 is relatively far, and the heat transferred between each other is small, which can effectively prevent thermal runaway of multiple battery cells 11 at the same time;

[0153] 10. In the present application, since the battery cluster is assembled in units of battery cells 1, the number of battery cells 11 in each battery cell 1 and the number of battery cells 1 in each battery cluster can be flexibly configured, so the voltage and capacity of the battery cluster can be flexibly configured;

[0154] 11. The battery system does not require multiple battery clusters to be connected in parallel. Each battery system only needs to be equipped with a high-voltage control box, which improves the reliability of the battery system, reduces the number of electrical components, and reduces costs.

[0155] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell (11) is provided with a connecting component for allowing the inside and outside of the battery cell (11) to circulate, and the connecting component is connected to the battery cell (11); substances inside the battery cell (11) can be discharged to the outside of the battery cell (11) through the connecting component, and substances outside the battery cell (11) can also enter the inside of the battery cell (11) through the connecting component; the connecting component includes an inlet component that allows substances outside the battery cell (11) to enter the inside of the battery cell (11) and a discharge component that allows substances inside the battery cell (11) to be discharged to the outside of the battery cell (11), and both the inlet component and the discharge component are connected to the battery cell (11); the inlet component includes a battery cell inlet pipeline (141), and the discharge component includes a battery cell discharge pipeline (142), and the battery cell inlet pipeline (141) and the battery cell discharge pipeline (142) are respectively connected to different positions on the battery cell (11).

2. The battery cell according to claim 1, characterized in that: The battery cell inlet pipeline (141) and the battery cell outlet pipeline (142) are two independent pipelines, and the battery cell inlet pipeline (141) and the battery cell outlet pipeline (142) are connected through the battery cell (11).

3. The battery cell according to claim 1, characterized in that: The battery cell inlet pipeline (141) is connected to the bottom position of the battery cell (11), and the battery cell outlet pipeline (142) is connected to the top position of the battery cell (11).

4. The battery cell according to claim 1, characterized in that: The battery cell inlet pipeline (141) and / or the battery cell outlet pipeline (142) are provided with a switch valve (145) and / or a one-way valve (17).

5. The battery cell according to claim 4, characterized in that: A one-way valve (17) is provided on the battery cell inlet pipeline (141) and / or the battery cell outlet pipeline (142); the one-way valve (17) is provided at a position close to the battery cell (11) on the battery cell inlet pipeline (141), and / or the one-way valve (17) is provided at a position close to the battery cell (11) on the battery cell outlet pipeline (142).

6. The battery cell according to claim 4, characterized in that: A one-way valve (17) is provided on the battery cell inlet pipeline (141) and / or the battery cell outlet pipeline (142); the one-way valve (17) and the battery cell (11) are connected via a hose.

7. The battery cell according to claim 1, characterized in that: At least a portion of the battery cell inlet pipeline (141) is a hose, and / or at least a portion of the battery cell outlet pipeline (142) is a hose.

8. The battery cell according to claim 1, characterized in that: The connecting component further comprises an external pipeline (15), wherein the external pipeline (15) comprises an external inlet pipeline (151) and an external outlet pipeline (152), wherein the external inlet pipeline (151) is connected to the battery cell inlet pipeline (141), and the external outlet pipeline (152) is connected to the battery cell outlet pipeline (142).

9. The battery cell according to claim 8, characterized in that: The external discharge pipeline (152) is provided with a pressure sensor (157).

10. The battery cell according to claim 8, characterized in that: The external inlet pipeline (151) and the external outlet pipeline (152) are both provided with switches (153) that can be opened and closed.

11. The battery cell according to claim 8, characterized in that: The external inlet pipeline (151) is arranged at the bottom of the battery core (11), and the external outlet pipeline (152) is arranged at the top of the battery core (11).

12. A battery cell, characterized in that: The invention comprises at least one battery cell (11) according to claim 1, wherein the connecting component comprises an inlet component and an outlet component, wherein the inlet component comprises a battery cell inlet pipeline (141), wherein the outlet component comprises a battery cell outlet pipeline (142), wherein the battery cell inlet pipeline (141) and the battery cell outlet pipeline (142) are respectively connected to different positions on the battery cell (11); and the connecting component further comprises an external pipeline (15), wherein the external pipeline (15) comprises an external inlet pipeline (151) and an external outlet pipeline (152), wherein the external inlet pipeline (151) is connected to the battery cell inlet pipeline (141), and the external outlet pipeline (152) is connected to the battery cell outlet pipeline (142).

13. The battery cell according to claim 12, wherein: There are a plurality of battery cells (11); the connecting component comprises an inlet component and an outlet component; the inlet component comprises a battery cell inlet pipeline (141); the outlet component comprises a battery cell outlet pipeline (142); the battery cell inlet pipeline (141) and the battery cell outlet pipeline (142) are respectively connected to different positions on the battery cell (11); the connecting component further comprises an external pipeline (15); the external pipeline (15) comprises an external inlet pipeline (151) and an external outlet pipeline (152); the external inlet pipeline (151) and the battery cell inlet pipeline (141) are connected to each other. 1), the external discharge pipeline (152) is connected to the battery cell discharge pipeline (142); the battery unit (1) further comprises a battery cell entry main pipeline (143) and a battery cell discharge main pipeline (144); the battery cell entry pipelines (141) on the plurality of battery cells (11) are first collected into the battery cell entry main pipeline (143) and then connected to the external entry pipeline (151); the battery cell discharge pipelines (142) on the plurality of battery cells (11) are first collected into the battery cell discharge main pipeline (144) and then connected to the external discharge pipeline (152).

14. The battery cell according to claim 12 or 13, characterized in that: The battery unit (1) further comprises a protective frame (12) and a bracket (13), wherein the protective frame (12) and the bracket (13) are respectively arranged at opposite ends of the battery cell (11), the battery cell discharge pipeline (142) is fixed on the protective frame (12), and the battery cell inlet pipeline (141) is fixed on the bracket (13).

15. The battery cell according to claim 14, wherein: The protection frame (12) is provided with at least one first accommodating groove (121), the bracket (13) is provided with at least one second accommodating groove (131), and the opposite ends of each battery cell (11) are respectively located in a corresponding first accommodating groove (121) and a corresponding second accommodating groove (131).

16. The battery cell according to claim 15, characterized in that The protection frame (12) comprises a protection plate (122) and a protection cover (123); the protection plate (122) is connected to the battery cell (11); the protection cover (123) is connected to the protection plate (122) and is located on a side of the protection plate (122) away from the battery cell (11); the first accommodating groove (121) is arranged in the protection plate (122); and the battery cell discharge pipeline (142) is fixed on the protection cover (123).

17. The battery cell according to claim 15, wherein: The bracket (13) comprises a tray (132) and a fixing bracket (133); the tray (132) is connected to the battery cell (11); the fixing bracket (133) is connected to the tray (132) and is located on a side of the tray (132) away from the battery cell (11); the second containing groove (131) is arranged in the tray (132); and the battery cell inlet pipeline (141) is fixed on the fixing bracket (133).

18. A battery cluster, characterized in that: Comprising at least one battery cell (1) according to any one of claims 12 to 17.

19. The battery cluster according to claim 18, characterized in that: The battery cluster further comprises a battery cluster support (2), and the battery unit (1) is arranged on the battery cluster support (2).

20. The battery cluster according to claim 19, characterized in that: The battery cluster support (2) comprises a bottom support frame (21) and a side connection frame (22), wherein the side connection frame (22) is connected to the bottom support frame (21) and is arranged on at least one side of the battery cluster, the bracket (13) of the battery unit (1) is connected to the bottom support frame (21), and the protection frame (12) of the battery unit (1) is connected to the side connection frame (22).

21. The battery cluster according to claim 20, characterized in that: The number of the side connecting frames (22) is two, and the two side connecting frames (22) are respectively arranged on two opposite sides of the battery cluster; the battery cluster bracket (2) also includes two side connecting beams (23) arranged on the other two opposite sides of the battery cluster, and the two ends of each side connecting beam (23) are respectively connected to the two side connecting frames (22).

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