Energy storage device and electric equipment

Abstract

According to the energy storage device and the electric equipment provided by the invention, the electrode assembly of the energy storage device can be ensured to be soaked in the electrolyte, so that the performance of the electrode assembly can be prevented from being influenced, and the service life of the energy storage device can be prolonged. The energy storage device comprises an electrode assembly and a shell assembly, the shell assembly comprises a shell and a backflow liquid supplementing pipeline, the backflow liquid supplementing pipeline and the electrode assembly are both installed in the shell, the backflow liquid supplementing pipeline is located between the electrode assembly and the shell and comprises a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is located on one side of the electrode assembly, and the liquid outlet pipe is located on the other side of the electrode assembly. The liquid inlet pipe is fixedly installed in the shell and communicates with the interior of the shell, the liquid outlet pipe is fixedly installed on the liquid inlet pipe and communicates with the liquid inlet pipe, the liquid outlet pipe is provided with a plurality of liquid outlet holes, the liquid outlet holes are sequentially arranged at intervals, each liquid outlet hole penetrates through the pipe wall of one side of the liquid outlet pipe in the thickness direction of the liquid outlet pipe, and an opening of each liquid outlet hole faces an electrode assembly of the energy storage device.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device and an electrical equipment. Background Art

[0002] In existing energy storage devices (such as single cells), the electrode assembly is usually immersed in electrolyte to ensure the normal use of the energy storage device. However, when the energy storage device is placed flat, as the electrolyte decreases during the charge and discharge process, the electrolyte level drops, which may cause part of the electrode assembly in the energy storage device to be unable to be immersed in the electrolyte, affecting the performance of the electrode assembly, thereby shortening the service life of the energy storage device. Summary of the invention

[0003] The present application provides an energy storage device and electrical equipment, which can ensure that the electrode components of the energy storage device are all immersed in the electrolyte, thereby avoiding the performance of the electrode components from being affected, and helping to extend the service life of the energy storage device.

[0004] In a first aspect, the present application provides an energy storage device. The energy storage device includes an electrode assembly and a shell assembly, the shell assembly includes a shell and a reflux rehydration pipeline, the reflux rehydration pipeline and the electrode assembly are both installed inside the shell, the reflux rehydration pipeline is located between the electrode assembly and the shell, the reflux rehydration pipeline includes an inlet pipe and an outlet pipe, the inlet pipe is located on one side of the electrode assembly, and the inlet pipe is connected to the inside of the shell, the outlet pipe is fixedly installed on the inlet pipe and is connected to the inlet pipe, the outlet pipe is provided with a plurality of outlet holes, the plurality of outlet holes are arranged in sequence, each outlet hole penetrates a tube wall on one side of the outlet pipe along the thickness direction of the outlet pipe, and the opening of each outlet hole faces the electrode assembly of the energy storage device.

[0005] Among them, there are two liquid inlet pipes, the two liquid inlet pipes are arranged at intervals, and are respectively located on the opposite sides of the electrode assembly of the energy storage device; there are multiple liquid outlet pipes, the multiple liquid outlet pipes are arranged at intervals in sequence, the multiple liquid outlet pipes are all located on the same side of the two liquid inlet pipes, and each of the liquid outlet pipes is connected to the two liquid inlet pipes.

[0006] Wherein, the number of the liquid outlet pipes is between 6 and 10.

[0007] Wherein, each of the liquid inlet pipes is provided with a plurality of mounting holes, and along the length direction of the liquid inlet pipe, the plurality of mounting holes are arranged at intervals, and each of the mounting holes penetrates a tube wall on one side of the liquid inlet pipe along the thickness direction of the liquid inlet pipe; each of the liquid outlet pipes includes a first part and two second parts, and along the thickness direction of the energy storage device, the first part is arranged opposite to the electrode assembly of the energy storage device, the first part is provided with the plurality of liquid outlet holes, and two second parts are respectively fixedly connected to the two ends of the first part, and are both communicated with the first part, and along the width direction of the energy storage device, the two second parts are respectively located on the opposite sides of the electrode assembly of the energy storage device, and each of the second parts extends in a direction away from the first part, and one end of each of the second parts away from the first part is fixedly installed on one of the mounting holes, and are both communicated with the liquid inlet pipe.

[0008] Wherein, the diameter of each of the liquid outlet holes is between 0.5 mm and 1 mm.

[0009] The shell is provided with a receiving cavity, the electrode assembly and the reflux refilling pipe are both received in the receiving cavity, the receiving cavity is also used to receive electrolyte, at least part of the electrode assembly is immersed in the electrolyte, and at least part of the liquid inlet pipe is immersed in the electrolyte.

[0010] When the electrolyte is consumed, the external pressure of the liquid inlet pipe is greater than the internal pressure of the liquid inlet pipe.

[0011] Wherein, the difference between the external pressure of the liquid inlet pipe and the internal pressure of the liquid inlet pipe is between 0.2 MPa and 0.3 MPa.

[0012] Wherein, along the thickness direction of the energy storage device, the ratio of the height of the liquid inlet pipe to the height of the electrode assembly is between 1 / 6 and 1 / 3.

[0013] Among them, the energy storage device also includes an end cover assembly, which is installed on one side of the shell in the length direction; the shell assembly also includes an insulating film, which is arranged on the inner side of the shell, and the insulating film has an opening on the side facing the end cover assembly, the electrode assembly and the reflux rehydration pipeline are both arranged inside the insulating film, and the reflux rehydration pipeline is located between the electrode assembly and the insulating film.

[0014] Wherein, the shell includes a placement surface and an appearance surface, and along the thickness direction of the energy storage device, the appearance surface and the placement surface are arranged opposite to each other; the end cover assembly is provided with a placement mark, and the placement mark is arranged on a side of the end cover assembly close to the placement surface.

[0015] In a second aspect, the present application further provides an electrical device, comprising an energy storage device as described in any one of the above items, wherein the energy storage device supplies power to the electrical device.

[0016] In the energy storage device provided in the present application, a reflux replenishment pipe is provided and the pressure difference between the inside and outside of the liquid inlet pipe of the reflux replenishment pipe is utilized so that the electrolyte can flow from the liquid inlet pipe into the liquid outlet pipe and flow out through the multiple liquid outlet holes of the liquid outlet pipe, thereby making it possible to drip the electrolyte onto the surface of the electrode assembly so that the electrode assembly can be soaked in the electrolyte, thereby ensuring that the electrode assembly can be soaked in the electrolyte all the time, avoiding affecting the performance of the electrode assembly and extending the service life of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0018] Figure 1 is an application scenario diagram of the energy storage system provided in the embodiment of the present application;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of the energy storage device in the energy storage system shown;

[0020] Figure 3 yes Figure 2 A schematic diagram of the exploded structure of the energy storage device shown;

[0021] Figure 4 yes Figure 2 A schematic diagram of the structure of the reflux refilling pipeline and the insulating film of the shell assembly in the energy storage device after being assembled;

[0022] Figure 5 yes Figure 4 A perspective view of the assembly of the return fluid supply pipe and the insulating film in the housing assembly shown;

[0023] Figure 6 yes Figure 4 The structural schematic diagram of the liquid inlet pipe in the reflux liquid replenishment pipeline is shown;

[0024] Figure 7 yes Figure 4 Schematic diagram of the structure of the liquid outlet pipe in the reflux fluid replenishment pipeline.

[0025] The names corresponding to the reference numerals in the figures are:

[0026] User load 300, electric energy conversion device 200, energy storage device 100, shell assembly 110, electrode assembly 120, end cover assembly 130, shell 110a, reflux rehydration pipeline 110b, insulating film 110c, opening 111, accommodating cavity 112, first electrode assembly 120a, second electrode assembly 120b, placement surface 114, appearance surface 115, liquid inlet pipe 11, liquid outlet pipe 12, liquid outlet hole 123, first part 121, second part 122, installation hole 113. DETAILED DESCRIPTION

[0027] Since the energy people need is highly temporal and spatial, in order to rationally use energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, to achieve the goal of carbon neutrality, green energy is currently mainly used to replace fossil energy to achieve the purpose of generating green electricity.

[0028] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0029] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0030] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0031] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0032] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0033] See also Figure 1 , Figure 1 This is an application scenario diagram of an energy storage system provided in an embodiment of the present application.

[0034] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1 A household energy storage system is shown, which includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, household appliances, etc.). The energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 100, and then supply the user load 300 for use during the peak electricity price, or supply the user load 300 for use when the power grid is off / power outage.

[0035] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 100 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where the electric energy is scarce for use.

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0037] The embodiment of the present application provides an energy storage device 100, which may be, but is not limited to, a single cell (secondary battery), and a battery module, a battery pack, a battery system, etc. composed of single cells. For a single cell, it may be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The single cell may be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this.

[0038] Next, the energy storage device 100 is explained in detail by taking the energy storage device 100 as a square single battery as an example.

[0039] Please refer to Figure 2 and Figure 3 , Figure 2 yes Figure 1 The schematic diagram of the structure of the energy storage device 100 in the energy storage system shown in FIG. Figure 3 yes Figure 2 The schematic diagram of the exploded structure of the energy storage device 100 is shown. For the convenience of description, the length direction of the energy storage device 100 is defined as the X-axis direction, the width direction of the energy storage device 100 is defined as the Y-axis direction, and the thickness direction of the energy storage device 100 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

[0040] The energy storage device 100 includes a shell assembly 110, an electrode assembly 120 and an end cap assembly 130, and the electrode assembly 120 and the end cap assembly 130 are both installed in the shell assembly 110. Among them, the shell assembly 110 includes a shell 110a, a reflux rehydration pipeline 110b and an insulating film 110c, and the reflux rehydration pipeline 110b and the insulating film 110c are both installed inside the shell 110a. Specifically, the shell 110a includes a placement surface 114 and an appearance surface 115. Along the thickness direction of the energy storage device 100 (Z-axis direction shown in the figure), the appearance surface 115 is arranged opposite to the placement surface 114. The shell 110a also has an opening 111 and a receiving cavity 112, and the receiving cavity 112 is connected to the opening 111. Specifically, the reflux rehydration pipeline 110b and the insulating film 110c are both received in the receiving cavity 112. In addition, the receiving cavity 112 is also used to receive electrolyte.

[0041] The electrode assembly 120 is accommodated in the accommodating cavity 112, and at least part of the electrode assembly 120 is immersed in the electrolyte. It is understandable that the electrode assembly 120 has a diaphragm (not shown), and the diaphragm can absorb the electrolyte by capillary action so that the electrolyte can infiltrate the electrode assembly 120. Exemplarily, the electrode assembly 120 is a wound electrode assembly. Specifically, the electrode assembly 120 is installed on the inner side of the reflux rehydration pipeline 110b and the insulating film 110c. In other words, the reflux rehydration pipeline 110b and the insulating film 110c are located between the electrode assembly 120 and the shell 110a. In this embodiment, there are two electrode assemblies 120. The two electrode assemblies 120 are respectively a first electrode assembly 120a and a second electrode assembly 120b. The first electrode assembly 120a is electrically connected to the second electrode assembly 120b, and the first electrode assembly 120a is arranged on the top side of the second electrode assembly 120b. In some other embodiments, the number of the electrode assembly 120 may also be one, and the present application does not impose a strict limitation on this.

[0042] In this embodiment, the end cap assembly 130 is installed on one side of the shell 110a in the length direction (the Y-axis direction shown in the figure), and closes the opening 111. The end cap assembly 130 is electrically connected to the electrode assembly 120. The end cap assembly 130 is provided with a placement mark 130a. The placement mark 130a is arranged on one side of the end cap assembly 130 close to the placement surface 114. The placement mark 130a can be used to identify the placement surface 114 of the energy storage device 100. When the energy storage device 100 is placed flat, it can ensure that the liquid inlet pipe 11 of the reflux replenishment pipe 110b is immersed in the electrolyte.

[0043] It should be noted that the directional terms such as "top" and "bottom" involved in this application are referenced to the attached Figure 1 The description of the orientation shown, with the positive direction of the Z-axis as the "top" and the negative direction of the Z-axis as the "bottom", does not indicate or imply 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 understood as a limitation on the present application.

[0044] See also Figures 4 to 6 , Figure 4 yes Figure 2 The schematic diagram of the structure of the energy storage device 100 after the reflux refilling pipe 110b and the insulating film 110c of the shell assembly 110 are assembled, Figure 5 yes Figure 4 A perspective view of the assembly of the return fluid supply pipe 110b and the insulating film 110c in the housing assembly 110 is shown. Figure 6 yes Figure 4 The schematic diagram of the structure of the liquid inlet pipe 11 in the reflux liquid replenishment pipeline 110b is shown.

[0045] In this embodiment, the insulating film 110c is arranged on the inner side of the shell 110a. Among them, the insulating film 110c is provided with an opening (not marked in the figure) on the side facing the end cap assembly 130, and the electrode assembly 120 and the reflux rehydration pipeline 110b are both arranged inside the insulating film 110c, and the reflux rehydration pipeline 110b is located between the electrode assembly 120 and the insulating film 110c. In this embodiment, the insulating film 110c is a mylar film. Exemplarily, ultrasonic hot melting can be used to fix the insulating film 110c and the reflux rehydration pipeline 110b. The insulating film 110c can be used to prevent the electrode assembly 120 from directly contacting the shell 110a and causing a short circuit in the electrode assembly 120, and can also prevent the reflux rehydration pipeline 110b and the electrode assembly 120 from being scratched during the installation process to the shell 110a.

[0046] In this embodiment, the reflux rehydration pipe 110b is used to absorb the electrolyte and return the electrolyte to the surface of the electrode assembly 120 to infiltrate the electrode assembly 120. The reflux rehydration pipe 110b includes an inlet pipe 11 and an outlet pipe 12, and the outlet pipe 12 is fixedly installed on the inlet pipe 11. Exemplarily, the inlet pipe 11 and the outlet pipe 12 are interference fit to ensure the assembly stability between the inlet pipe 11 and the outlet pipe 12. In some other embodiments, the inlet pipe 11 and the outlet pipe 12 can also be fixedly installed by gluing.

[0047] In this embodiment, the liquid inlet pipe 11 is located on one side of the electrode assembly 120, and the liquid inlet pipe 11 is connected to the interior of the shell 110a. At least part of the liquid inlet pipe 11 is immersed in the electrolyte to ensure that the electrolyte can smoothly enter the liquid inlet pipe 11 and flow to the entire reflux refill pipe 110b, so that the electrode assembly 120 can be infiltrated. In addition, when the electrolyte is consumed, the external pressure of the liquid inlet pipe 11 is greater than the internal pressure of the liquid inlet pipe 11. Specifically, the difference between the external pressure of the liquid inlet pipe 11 and the internal pressure of the liquid inlet pipe 11 is between 0.2MPa and 0.3MPa.

[0048] It is understandable that when the energy storage device 100 is working, the consumption of electrolyte will produce a large amount of gas, which increases the external pressure of the liquid inlet pipe 11, thereby causing a pressure difference between the outside and inside of the liquid inlet pipe 11, and then the electrolyte can enter the liquid inlet pipe 11 and flow to the entire reflux replenishment pipeline 110b to realize the reflux replenishment function.

[0049] In this embodiment, there are two liquid inlet pipes 11. Along the width direction of the energy storage device 100 (the Y-axis direction shown in the figure), the two liquid inlet pipes 11 are arranged at intervals and are respectively located on opposite sides of the electrode assembly 120. Both liquid inlet pipes 11 are connected to the interior of the shell 110a. The electrolyte in the shell 110a can flow into the reflux rehydration pipe 110b through the liquid inlet pipe 11. Exemplarily, the pipes of the two liquid inlet pipes 11 are both circular pipes. Among them, along the height direction of the energy storage device 100 (the Z-axis direction shown in the figure), the ratio of the height of the pipe of the liquid inlet pipe 11 to the height of the electrode assembly 120 is between 1 / 6 and 1 / 3. Exemplarily, the diameter of the pipe of the liquid inlet pipe 11 is between 5 mm and 10 mm, so as to facilitate the subsequent processing of the liquid inlet pipe 11.

[0050] Each liquid inlet pipe 11 is provided with a plurality of mounting holes 113, and the plurality of mounting holes 113 are arranged at intervals along the length direction of the liquid inlet pipe 11. Each mounting hole 113 penetrates a tube wall of one side of the liquid inlet pipe 11 along the thickness direction of the liquid inlet pipe 11. Exemplarily, the plurality of mounting holes 113 are all circular holes. In some other embodiments, the plurality of mounting holes 113 may also be square holes or other special-shaped holes.

[0051] Please refer to Figure 4 , Figure 5 and Figure 7 , Figure 7 yes Figure 4 The schematic diagram of the structure of the liquid outlet pipe 12 in the reflux liquid replenishment pipeline 110b is shown.

[0052] In this embodiment, the liquid outlet pipe 12 is provided with a plurality of liquid outlet holes 123. The plurality of liquid outlet holes 123 are arranged in sequence and spaced apart. Each liquid outlet hole 123 penetrates a side wall of the liquid outlet pipe 12 along the thickness direction of the liquid outlet pipe 12, and the opening of each liquid outlet hole 123 faces the electrode assembly 120. Among them, the diameter of each liquid outlet hole 123 is between 0.5 mm and 1 mm. This setting can prevent the electrolyte from flowing out of the liquid outlet hole 123 from being too large, and ensure that the electrolyte can flow to the entire pipeline of the first part 121 of the liquid outlet pipe 12, so that the surface of the first electrode assembly 120a can be covered by the electrolyte, thereby ensuring that the electrolyte can infiltrate the two electrode assemblies 120.

[0053] In this embodiment, there are multiple liquid outlet pipes 12. The multiple liquid outlet pipes 12 are arranged in sequence at intervals. The multiple liquid outlet pipes 12 are all located on the same side of the two liquid inlet pipes 11, and are all fixedly installed between the two liquid inlet pipes 11. Each liquid outlet pipe 12 is connected to the two liquid inlet pipes 11. Exemplarily, the number of liquid outlet pipes 12 is between 6 and 10, which can not only make the electrolyte flowing out of the reflux replenishment pipe 110b evenly infiltrate the electrode assembly 120, ensuring that the electrolyte has a better infiltration effect on the electrode assembly 120, but also help save production costs.

[0054] Each liquid outlet pipe 12 includes a first part 121 and two second parts 122. Among them, along the thickness direction of the energy storage device 100 (Z-axis direction in the figure), the first part 121 is arranged opposite to the electrode assembly 120 of the energy storage device 100. Specifically, the first part 121 is provided with a plurality of liquid outlet holes 123. The two second parts 122 are respectively fixedly connected to the two ends of the first part 121, and are both connected to the first part 121. Along the width direction of the energy storage device 100 (Y-axis direction in the figure), the two second parts 122 are respectively located on the opposite sides of the electrode assembly 120 of the energy storage device 100. Each second part 122 extends in a direction away from the first part 121. Specifically, one end of each second part 122 away from the first part 121 is installed in a mounting hole 113 of a liquid inlet pipe 11, and is connected to the liquid inlet pipe 11.

[0055] Specifically, when the energy storage device 100 is working, the electrolyte enters the two liquid inlet pipes 11 under the effect of the pressure difference between the inside and outside of the liquid inlet pipes 11, and fills the entire pipes of the two liquid inlet pipes 11. Then, the electrolyte flows from the two liquid inlet pipes 11 into the second part 122 of the plurality of liquid outlet pipes 12, and from the second part 122 into the first part 121, and flows out through the plurality of liquid outlet holes 123, so that the electrolyte is evenly dripped onto the surface of the first electrode assembly 120a.

[0056] It is understandable that the energy storage device 100 consumes electrolyte when working, causing the electrolyte level to drop, which may affect the performance of the first electrode assembly 120a due to the inability to be soaked in the electrolyte. By providing a reflux refilling pipe 110b, the electrolyte in the housing 110a can enter the reflux refilling pipe 110b under the squeezing action of the air pressure, and reflux to the surface of the first electrode assembly 120a through the liquid outlet 123, so that the first electrode assembly 120a can be soaked in the electrolyte, thereby ensuring that the two electrode assemblies 120 of the energy storage device 100 are soaked in the electrolyte for a long time, thereby avoiding the performance of the electrode assembly 120 from being affected, which helps to extend the service life of the energy storage device 100.

[0057] The present application also provides an electric device, which includes the energy storage device 100, and the energy storage device 100 supplies power to the electric device. The electric device may be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

[0058] The above description is only a specific implementation 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; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An energy storage device, characterized in that: It includes an electrode assembly and a shell assembly, the shell assembly includes a shell and a reflux rehydration pipe, the reflux rehydration pipe and the electrode assembly are both installed inside the shell, the reflux rehydration pipe is located between the electrode assembly and the shell, the reflux rehydration pipe includes an inlet pipe and an outlet pipe, the inlet pipe is located on one side of the electrode assembly, and the inlet pipe is connected to the inside of the shell, the outlet pipe is fixedly installed on the inlet pipe and is connected to the inlet pipe, the outlet pipe is provided with a plurality of outlet holes, the plurality of outlet holes are arranged in sequence at intervals, each of the outlet holes penetrates a tube wall on one side of the outlet pipe along the thickness direction of the outlet pipe, and the opening of each outlet hole faces the electrode assembly of the energy storage device.

2. The energy storage device according to claim 1, characterized in that: There are two liquid inlet pipes, which are arranged at intervals and are respectively located on two opposite sides of the electrode assembly of the energy storage device; There are multiple liquid outlet pipes, and the multiple liquid outlet pipes are arranged in sequence at intervals. The multiple liquid outlet pipes are all located on the same side of the two liquid inlet pipes, and each of the liquid outlet pipes is connected to the two liquid inlet pipes.

3. The energy storage device according to claim 2, characterized in that: The number of the liquid outlet pipes is between 6 and 10.

4. The energy storage device according to claim 2 or 3, characterized in that: Each of the liquid inlet pipes is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged at intervals along the length direction of the liquid inlet pipe, and each of the mounting holes penetrates a tube wall of one side of the liquid inlet pipe along the thickness direction of the liquid inlet pipe; Each of the liquid outlet pipes includes a first part and two second parts. Along the thickness direction of the energy storage device, the first part is arranged opposite to the electrode assembly of the energy storage device. The first part is provided with the multiple liquid outlet holes. The two second parts are respectively fixedly connected to the two ends of the first part and are both communicated with the first part. Along the width direction of the energy storage device, the two second parts are respectively located on the opposite sides of the electrode assembly of the energy storage device. Each of the second parts extends in a direction away from the first part. One end of each of the second parts away from the first part is fixedly installed in one of the installation holes and is communicated with the liquid inlet pipe.

5. The energy storage device according to claim 1, characterized in that: The diameter of each of the liquid outlet holes is between 0.5 mm and 1 mm.

6. The energy storage device according to claim 1, characterized in that: The shell is provided with a receiving cavity, the electrode assembly and the reflux refilling pipe are both received in the receiving cavity, the receiving cavity is also used to receive electrolyte, at least part of the electrode assembly is immersed in the electrolyte, and at least part of the liquid inlet pipe is immersed in the electrolyte.

7. The energy storage device according to claim 6, characterized in that: When the electrolyte is consumed, the external pressure of the liquid inlet pipe is greater than the internal pressure of the liquid inlet pipe.

8. The energy storage device according to claim 7, characterized in that: The difference between the external pressure of the liquid inlet pipe and the internal pressure of the liquid inlet pipe is between 0.2 MPa and 0.3 MPa.

9. The energy storage device according to claim 1, characterized in that: Along the thickness direction of the energy storage device, the ratio of the height of the liquid inlet pipe to the height of the electrode assembly is between 1 / 6 and 1 / 3.

10. The energy storage device according to claim 1, characterized in that: The energy storage device further comprises an end cap assembly, wherein the end cap assembly is mounted on one side of the shell in the length direction; The shell assembly also includes an insulating film, which is arranged on the inner side of the shell, and an opening is provided on the side of the insulating film facing the end cover assembly. The electrode assembly and the reflux rehydration pipeline are both arranged inside the insulating film, and the reflux rehydration pipeline is located between the electrode assembly and the insulating film.

11. The energy storage device according to claim 10, characterized in that: The shell comprises a placement surface and an appearance surface, and along the thickness direction of the energy storage device, the appearance surface and the placement surface are arranged opposite to each other; The end cover assembly is provided with a placement mark, and the placement mark is arranged on a side of the end cover assembly close to the placement surface.

12. An electrical device, characterized in that: It comprises an energy storage device as described in any one of claims 1 to 11, and the energy storage device supplies power to the electrical equipment.

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