Battery liquid supplementing system, control method and control device

Abstract

The invention discloses a battery liquid supplementing system, a control method and a control device, and relates to the technical field of battery liquid supplementing, the battery liquid supplementing system is used for supplementing liquid to a battery cell with a liquid supplementing hole, the battery liquid supplementing system comprises a gas detection device and a liquid supplementing device, the gas detection device is provided with a gas flow path, and the liquid supplementing device is arranged in the gas flow path. The gas flow path is used for being communicated with the liquid supplementing hole, and a gas detection analyzer is arranged on the gas flow path and used for detecting and analyzing gas penetrating out of the liquid supplementing hole. The technical scheme provided by the invention has the technical effects that the gas detection device is matched with the liquid supplementing device, so that the purpose of detecting and analyzing the gas generated in the battery cell is achieved, the use amount of the liquid supplementing required by the battery cell is further judged, quantitative liquid supplementing operation is performed, and the efficiency of the battery cell is improved. Quantitative electrolyte is supplemented after gas generated by side reaction in the battery is discharged regularly, so that the service life of the battery is prolonged, and the safety risk of the battery is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery refilling, and in particular to a battery refilling system, a control method and a control device. Background Art

[0002] At present, during the use of lithium-ion batteries, due to electrochemical reactions and other side reactions, the electrolyte in the battery undergoes irreversible loss, and harmful gases are generated inside the battery, causing the battery shell to swell, and in severe cases even cause the battery shell to rupture; the lack of electrolyte and the generation of harmful gases affect the battery life and even cause safety hazards to the battery. Summary of the invention

[0003] The main purpose of the present invention is to propose a battery replenishing system, control method and control device, aiming to solve the problem that the electrolyte cannot be replenished after the battery cell is manufactured, resulting in a decrease in electrolyte after battery circulation, an increase in the internal resistance of the battery cell, and a shortening of the battery life.

[0004] To achieve the above-mentioned purpose, the present invention provides a battery refilling system for refilling a battery cell provided with a refilling hole, the battery refilling system comprising:

[0005] A gas detection device is formed with a gas flow path, the gas flow path is used to communicate with the liquid infusion hole, and a gas detection analyzer is provided on the gas flow path to detect and analyze the gas leaking from the liquid infusion hole; and

[0006] The liquid replenishing device is formed with a liquid replenishing flow path, the liquid replenishing flow path is used to communicate with the liquid replenishing hole, and a liquid injector is arranged on the gas flow path to replenish liquid into the battery cell through the liquid replenishing hole.

[0007] In one embodiment, a common flow path section is formed on the battery liquid replenishing system, and the common flow path section is used to communicate with the liquid replenishing hole;

[0008] The gas flow path includes the common flow path section and a gas branch path section connected to the common flow path section, and the gas detection analyzer is arranged on the gas branch path section;

[0009] The infusion flow path includes the common flow path section and a infusion branch path section connected to the common flow path section, and the injection machine is arranged on the infusion branch path section.

[0010] In one embodiment, at least one of a first pressure gauge, a first valve, a gas storage tank, and a vacuum pumping device is also provided on the gas branch section.

[0011] In one embodiment, at least one of a second pressure gauge and a solenoid valve is further provided on the fluid infusion branch section.

[0012] In one embodiment, the common flow path section includes a current collecting section and a plurality of branch sections all connected to the current collecting section, and the plurality of branch sections are respectively arranged to correspond to a plurality of battery cells;

[0013] The gas branch and the liquid replenishment branch are both connected to the collecting section.

[0014] The present invention also proposes a battery refilling control method, based on the battery refilling system described above, a vacuum pump is provided on the gas flow path, and a liquid injection machine is provided on the refilling flow path;

[0015] The battery refilling control method comprises the following steps:

[0016] Get the health status parameters of the battery cell;

[0017] When the health condition parameter meets the abnormal condition condition, obtaining the concentration parameter of the gas in the battery cell;

[0018] When the concentration parameter of the gas meets the abnormal concentration condition, controlling the vacuum pumping device to vacuum the inside of the battery cell until the vacuum qualified condition is met;

[0019] The required amount of liquid replenishment for the battery cell is calculated according to the concentration parameter of the gas, and the liquid injection machine is controlled to replenish the liquid to the battery cell according to the required amount of liquid replenishment for the battery cell.

[0020] In one embodiment, the following steps are also included:

[0021] Obtaining a battery cell cycle life parameter of a battery pack assembled from a plurality of the battery cells;

[0022] When the battery cell cycle life parameter meets a preset condition, the step of obtaining the health status parameter of the battery cell is performed at intervals of a first preset time.

[0023] In one embodiment, a first valve and a gas storage tank are provided on the gas flow path;

[0024] The obtaining of the concentration parameter of the gas in the battery cell comprises:

[0025] Controlling the first valve and the valve of the gas storage tank to open and maintain a second preset time length, so that the gas in the battery cell enters the gas storage tank;

[0026] Obtain the concentration parameters on the gas detection analyzer.

[0027] In one embodiment, controlling the vacuum pumping device to vacuum the interior of the battery cell until a vacuum qualification condition is met includes:

[0028] Controlling the first valve to open and the valve of the gas storage tank to close;

[0029] The vacuuming device is controlled to operate to vacuumize, and the vacuuming is maintained for a third preset time period until a vacuum qualification condition is met.

[0030] The present invention also proposes a battery refilling control device, which includes: a memory, a processor, and a battery refilling control program stored in the memory and executable on the processor, wherein the battery refilling control program implements the steps of the battery refilling control method described above when executed by the processor.

[0031] The technical solution of the present invention achieves the purpose of detecting and analyzing the gas generated inside the battery cell by arranging the gas detection device and the fluid replenishing device to cooperate with each other, thereby determining the amount of fluid replenishment required for the battery cell and performing a quantitative fluid replenishment operation. By regularly discharging the gas generated by side reactions in the battery and then replenishing a quantitative electrolyte, the battery service life is extended and the battery safety risk is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 A schematic structural diagram of an embodiment of a battery liquid replenishing system provided by the present invention;

[0034] Figure 2 A schematic diagram of a battery cell with a liquid replenishing hole in the battery liquid replenishing system provided by the present invention;

[0035] Figure 3 for Figure 1 A schematic diagram of the structure of a control device for a hardware operating environment involved in the embodiment scheme;

[0036] Figure 4 A schematic flow chart of an embodiment of a battery liquid replenishment control method provided by the present invention.

[0037] Description of Figure Numbers:

[0038] 100. Battery refilling system; 1. Battery cell; 11. Refilling hole; 2. Gas detection device; 21. Gas flow path; 22. Gas detection analyzer; 23. Injection machine; 3. Refilling device; 31. Refilling flow path; 4. Common flow section; 41. Gas branch section; 42. Refilling branch section; 5. First pressure gauge; 6. First valve; 7. Gas storage tank; 8. Vacuum pumping device; 9. Second pressure gauge; 10. Solenoid valve.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] At present, during the use of lithium-ion batteries, due to electrochemical reactions and other side reactions, the electrolyte in the battery undergoes irreversible loss, and harmful gases are generated inside the battery, causing the battery shell to swell, and in severe cases even cause the battery shell to rupture; the lack of electrolyte and the generation of harmful gases affect the battery life and even cause safety hazards to the battery.

[0044] To solve the above problems, the present invention proposes a battery refilling system, a control method and a control device, which aims to solve the problem that the electrolyte cannot be replenished after the battery cell is manufactured, resulting in a decrease in electrolyte after battery circulation, an increase in the internal resistance of the battery cell, and a shortening of the battery life.

[0045] The invention provides a battery liquid replenishing system.

[0046] See also Figure 1 and Figure 2 In one embodiment of the present invention, the battery refilling system is used to refill the battery cell 1 provided with a refilling hole 11. The battery refilling system 100 includes a gas detection device 2 and a refilling device 3. The gas detection device 2 is formed with a gas flow path 21, and the gas flow path 21 is connected to the refilling hole 11. A gas detection analyzer 22 is provided on the gas flow path 21 to detect and analyze the gas transmitted from the refilling hole 11; and the refilling device 3 is formed with a refilling flow path 31, and the refilling flow path 31 is connected to the refilling hole 11. A liquid injector 23 is provided on the gas flow path 21 to refill the battery cell 1 through the refilling hole 11.

[0047] In the technical solution of the present invention, a refilling hole 11 is provided on the battery cell 1 for refilling operation. By connecting the gas flow path 21 with the refilling hole 11, the gas detection device 2 can be used to extract, detect and analyze the side reaction gas generated in the battery cell 1, and the amount of refilling required for the battery cell 1 can be judged according to the extracted gas volume, so that the electrolyte is transferred to the battery cell 1 through the refilling flow path 31 by the injection machine 23 for quantitative refilling. In addition, through the setting of the refilling hole 11, that is, the manufacturing of the battery cell 1 is not a one-time seal, the injection amount of the battery cell 1 can be flexibly controlled, and the residual liquid amount of the fresh battery cell can be further reduced.

[0048] In some embodiments of the present invention, the gas detection device 2 and the liquid replenishing device 3 can be integrated in the battery cell 1, or can be separately placed externally to achieve two usage forms of online detection, real-time replenishment, or liquid replenishment during maintenance.

[0049] It should be noted that in order to achieve normal use of the battery cell 1 after the refilling hole 11 is refilled, a valve is installed in the refilling hole 11 to control the opening and closing of the refilling hole 11, thereby controlling the opening and closing of the gas flow path 21 and the refilling flow path 31.

[0050] In order to integrate the flow paths for use, a common flow path section 4 is formed on the battery refilling system 100, and the common flow path section 4 is used to connect the refilling hole 11; the gas flow path 21 includes the common flow path section 4 and a gas branch path section 41 connected to the common flow path section 4, and the gas detection analyzer 22 is arranged on the gas branch path section 41; the refilling flow path 31 includes the common flow path section 4 and a refilling branch path section 42 connected to the common flow path section 4, and the injection machine 23 is arranged on the refilling branch path section 42. In this arrangement, the gas flow path 21 and the refilling flow path 31 are merged and connected to the common flow path section 4, avoiding the need to open multiple refilling holes 11 on the battery cell for use, which is convenient and safe to use.

[0051] Furthermore, at least one of a first pressure gauge 5, a first valve 6, a gas storage tank 7, and a vacuum pumping device 8 is also provided on the gas branch section 41. In this way, when the gas branch section 41 is used for gas extraction detection and analysis, the gas pressure can be timely monitored by the electric first pressure gauge 5 to perform exhaust operations, and the first valve 6 is used to control the opening and closing of the gas branch section 41 to ensure the safety of the exhaust operation. At the same time, the extracted gas can be detected and analyzed by the gas detection analyzer 22 through the gas storage tank 7. After the detection and analysis is completed, a vacuum is established in the gas branch section 41 through the vacuum pumping device 8, and the gas is discharged through the gas branch section 41.

[0052] It should be noted that, in the present invention, preferably, a first pressure gauge 5 , a first valve 6 , a gas storage tank 7 and a vacuum pumping device 8 are provided on the gas branch section 41 .

[0053] In the embodiment of the present invention, there is no limitation on the specific configuration of the vacuum device 8, which may be, for example, a vacuum pump.

[0054] Furthermore, at least one of a second pressure gauge 9 and a solenoid valve 10 is provided on the fluid replenishment branch section 42; thus, the vacuum degree in the battery cell can be read by the second pressure gauge 9 for judgment, and the solenoid valve 10 can control the switch of the fluid injection machine 23 for fluid replenishment.

[0055] It should be noted that, in the present invention, preferably, a second pressure gauge 9 and a solenoid valve 10 are provided on the fluid infusion branch section 42 .

[0056] Furthermore, the common flow path section 4 includes a collecting section and a plurality of branch sections connected to the collecting section, and the plurality of branch sections are respectively arranged to correspond to a plurality of battery cells 1; the gas branch and the fluid replenishment branch are both connected to the collecting section; in this way, by setting a plurality of branch sections, a plurality of battery cells 1 can be connected, so as to achieve the operation of replenishing the plurality of battery cells 1, thereby improving practicality.

[0057] It should be noted that, in the present invention, the number of the battery cells 1 can be one or more. Preferably, in an embodiment of the present invention, a plurality of battery cells 1 are selected to form a battery cell module for use.

[0058] It should be explained that the gas flow path 21, the fluid infusion flow path 31, the common flow path section 4, the gas branch section 41, the branch section, the fluid infusion branch and the collecting section in the present invention can all be replaced by pipelines.

[0059] In some embodiments of the present invention, there is no specific limitation on the method of determining the generation of side reaction gas. It can also be that a strain gauge is preset on the battery cell 1 to monitor the internal stress of the battery cell 1. When the stress exceeds a preset threshold, it can be determined that a large amount of gas is generated inside the battery cell 1, affecting the life and safety of the battery cell.

[0060] See also Figure 3 The present invention also proposes a battery refilling control device, which is electrically connected to the gas detection device and the refilling device 3 to control the battery refilling system.

[0061] The control device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005; wherein the communication bus 1002 is used to realize the connection and communication between these devices; the user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface; the network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface); the memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory; the memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0062] Those skilled in the art will understand that Figure 3 The structure shown in the figure does not constitute a limitation on the battery replenishment control device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0063] like Figure 3 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a battery refilling control program.

[0064] exist Figure 3 In the battery refilling control device shown, the processor 1001 calls the battery refilling control program stored in the memory 1005 and performs the following operations:

[0065] Get the health status parameters of the battery cell;

[0066] When the health condition parameter meets the abnormal condition condition, obtaining the concentration parameter of the gas in the battery cell 1;

[0067] When the concentration parameter of the gas meets the abnormal concentration condition, the vacuum pumping device 8 is controlled to vacuum the inside of the battery cell until the vacuum qualified condition is met;

[0068] The required amount of liquid replenishment for the battery cell is calculated according to the concentration parameter of the gas, and the liquid injection machine 23 is controlled to replenish the liquid to the battery cell according to the required amount of liquid replenishment for the battery cell 1 .

[0069] Furthermore, the processor 1001 calls the battery refilling program stored in the memory 1005, and also performs the following operations:

[0070] Obtaining a cell cycle life parameter of a battery pack assembled from a plurality of the cell 1;

[0071] When the cycle life parameter of the battery cell 1 meets a preset condition, the step of obtaining the health status parameter of the battery cell is performed at intervals of a first preset time.

[0072] Furthermore, the processor 1001 calls the battery refilling program stored in the memory 1005, and also performs the following operations:

[0073] Controlling the first valve 6 and the valve of the gas storage tank 7 to open and maintain a second preset time length, so that the gas in the battery cell 1 enters the gas storage tank 7;

[0074] Acquire the concentration parameters on the gas detection analyzer 22.

[0075] Furthermore, the processor 1001 calls the battery refilling program stored in the memory 1005, and also performs the following operations:

[0076] The step of controlling the vacuum pumping device 8 to vacuum the interior of the battery cell 1 until a vacuum qualification condition is met includes:

[0077] Control the first valve 6 to open and the valve of the gas storage tank 7 to close;

[0078] The vacuuming device 8 is controlled to operate to vacuum and maintain the vacuum for a third preset time until a vacuum qualification condition is met.

[0079] In the technical solution provided by the present invention, by obtaining the health status parameters of the battery cell and judging whether side reaction gases are generated, the side reaction gases generated are detected and analyzed according to the gas detection device, and vacuum treatment is performed after the gas concentration parameters are determined. The replenishment amount is calculated according to the gas concentration parameters to replenish the battery cell 1, thereby achieving the effects of quantitative exhaust and quantitative replenishment, thereby increasing the service life of the battery cell 1.

[0080] Based on the above hardware structure, the present invention proposes a battery refilling control method, wherein the battery refilling control method obtains the health status of the battery cell 1, and the gas detection device 2 quantitatively exhausts the battery cell 1 after detection and analysis, and calculates the refilling amount according to the gas production concentration, and uses the refilling device 3 to quantitatively refill the battery cell 1 after exhaust.

[0081] Please refer to Figure 4 , Figure 4 A schematic flow chart of an embodiment of a battery liquid replenishment control method provided by the present invention.

[0082] S10: Obtain health status parameters of the battery cell;

[0083] It should be noted that the battery cell 1 also includes a battery management system (BMS), and the battery health life (SOH) status can be determined through the BMS data.

[0084] S20: When the health condition parameter meets the abnormal condition condition, obtaining the concentration parameter of the gas in the battery cell 1;

[0085] Specifically, when the SOH is lower than 90%, it can be determined that a large amount of side reaction gas may be generated inside the battery cell 1 , that is, the gas flow path 21 is inserted into the liquid replenishing hole 11 to collect the gas, so as to obtain the gas concentration parameter.

[0086] S30: When the concentration parameter of the gas meets the abnormal concentration condition, the vacuum pumping device 8 is controlled to vacuum the inside of the battery cell 1 until the vacuum qualified condition is met;

[0087] S40: calculating the required amount of liquid replenishment for the battery cell according to the concentration parameter of the gas, and controlling the liquid injection machine 23 to replenish liquid to the battery cell 1 according to the required amount of liquid replenishment for the battery cell 1 .

[0088] Specifically, the liquid replenishment amount of the battery cell is calculated according to the gas production concentration, and the corresponding amount of electrolyte is weighed and put into the liquid injection machine 23 for liquid replenishment operation, and the liquid injection machine 23 is closed, and the battery cell is left to stand to achieve component infiltration. After the end, the liquid replenishment hole 11 is closed.

[0089] It should be noted that the cell resting time is set to 1-3 hours. In this embodiment, preferably, the resting time is set to 2 hours.

[0090] In this embodiment, the gas detection device can detect and analyze the gas inside the battery cell 1, and the gas parameters can be determined based on the gas composition, thereby achieving the purpose of quantitatively discharging harmful gases in the battery cell 1. The vacuum pumping device 8 can establish a vacuum in the pipeline, and at the same time, the amount of fluid replenishment is calculated based on the extracted gas concentration. The calculated amount of fluid replenishment is replenished through the injection machine 23, thereby achieving the purpose of quantitative fluid replenishment of the battery cell 1.

[0091] It should be noted that, in this embodiment, the gas detection device is a harmful gas detection device.

[0092] Furthermore, in order to achieve the purpose of detecting and replenishing the battery pack during its life cycle after installation, in this embodiment, before step S10, the following is further included:

[0093] S01: Obtaining a battery cell cycle life parameter of a battery pack assembled from a plurality of the battery cells 1;

[0094] S02: When the cycle life parameter of the battery cell 1 meets a preset condition, the step of obtaining the health status parameter of the battery cell is performed at intervals of a first preset time.

[0095] In this embodiment, by acquiring the cycle life parameters of the battery cells of the battery pack, the electrolyte content of the battery pack during its life cycle can be monitored, and the electrolyte replenishment operation can be performed in a timely manner.

[0096] It should be explained that the preset condition may be that when the cycle life of the battery cell is greater than 1000cls (passenger cars usually require the battery cell life to be greater than 1500cls@80% SOH), the step of obtaining the health status parameters of the battery cell is performed every 100cls.

[0097] Furthermore, in this embodiment, in order to facilitate exhaust, after step S20, the following steps are further included:

[0098] S21: Controlling the first valve 6 and the valve of the gas storage tank 7 to open and maintain a second preset time, so that the gas in the battery cell 1 enters the gas storage tank 7;

[0099] S22: Obtain concentration parameters on the gas detection analyzer 22.

[0100] In this embodiment, the gas storage tank 7 is collected by opening the valve of the gas storage tank 7 and letting it stand, and the volatilized gas in the battery cell 1 is collected. The concentration of the collected gas components is analyzed by the gas detection analyzer 22, so that the gas storage tank 7 can collect the gas. The preset time length is set to let the gas stand to obtain the gas concentration parameters, and then realize the subsequent quantitative exhaust operation.

[0101] It should be noted that the standing time is 2-10 minutes. In this embodiment, preferably, the standing time is set to 5 minutes.

[0102] Furthermore, in this embodiment, in order to facilitate calculation of the required amount of fluid replacement, after step S30, the following steps are further included:

[0103] S31: Control the first valve 6 to open and the valve of the gas storage tank 7 to close;

[0104] S32: Control the vacuum pumping device 8 to operate for vacuum pumping and maintain the vacuum pumping for a third preset time until a vacuum qualification condition is met.

[0105] In this embodiment, the remaining gas in the pipeline can be extracted by operating the vacuum pumping device 8, thereby facilitating the calculation of gas concentration parameters.

[0106] Specifically, by closing the valve of the gas storage tank 7 and opening the vacuum pumping device 8, a vacuum is established in the gas flow path 21 and the liquid replenishing flow path 31, and the vacuum degree in the battery cell 1 and the gas flow path 21 and the liquid replenishing flow path 31 is read by the first pressure gauge 5 and the second pressure gauge 9. After the vacuum qualified condition is met, the vacuum pumping device 8 is closed, and the liquid replenishing is performed after the required liquid replenishing amount is calculated.

[0107] The preset duration is set to 5-15 minutes. In this embodiment, preferably, the preset duration is set to 10 minutes.

[0108] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery refilling system for refilling a battery cell provided with a refilling hole, characterized in that: The battery refilling system comprises: A gas detection device is formed with a gas flow path, the gas flow path is used to communicate with the liquid infusion hole, and a gas detection analyzer is provided on the gas flow path to detect and analyze the gas leaking from the liquid infusion hole; and The liquid replenishing device is formed with a liquid replenishing flow path, the liquid replenishing flow path is used to communicate with the liquid replenishing hole, and a liquid injector is arranged on the gas flow path to replenish liquid into the battery cell through the liquid replenishing hole.

2. The battery refilling system according to claim 1, characterized in that: A common flow section is formed on the battery liquid replenishing system, and the common flow section is used to communicate with the liquid replenishing hole; The gas flow path includes the common flow path section and a gas branch path section connected to the common flow path section, and the gas detection analyzer is arranged on the gas branch path section; The infusion flow path includes the common flow path section and a infusion branch path section connected to the common flow path section, and the injection machine is arranged on the infusion branch path section.

3. The battery refilling system according to claim 2, characterized in that: At least one of a first pressure gauge, a gas storage tank and a vacuum pumping device is also provided on the gas branch section.

4. The battery refilling system according to claim 2, characterized in that: At least one of a second pressure gauge and a solenoid valve is also provided on the fluid infusion branch section.

5. The battery refilling system according to claim 2, characterized in that: The common flow path section includes a current collecting section and a plurality of branch sections all connected to the current collecting section, and the plurality of branch sections are used to correspond to a plurality of battery cells respectively; The gas branch and the liquid replenishment branch are both connected to the collecting section.

6. A battery refilling control method, based on the battery refilling system according to any one of claims 1 to 5, characterized in that: A vacuum pump is provided on the gas flow path, and a liquid injection machine is provided on the liquid infusion flow path; The battery refilling control method comprises the following steps: Get the health status parameters of the battery cell; When the health condition parameter meets the abnormal condition condition, obtaining the concentration parameter of the gas in the battery cell; When the concentration parameter of the gas meets the abnormal concentration condition, controlling the vacuum pumping device to vacuum the inside of the battery cell until the vacuum qualified condition is met; The required amount of liquid replenishment for the battery cell is calculated according to the concentration parameter of the gas, and the liquid injection machine is controlled to replenish the liquid to the battery cell according to the required amount of liquid replenishment for the battery cell.

7. The battery refilling control method according to claim 6, characterized in that: The following steps are also included: Obtaining a battery cell cycle life parameter of a battery pack assembled from a plurality of the battery cells; When the battery cell cycle life parameter meets a preset condition, the step of obtaining the health status parameter of the battery cell is performed at intervals of a first preset time.

8. The battery refilling control method according to claim 6, characterized in that: A first valve and a gas storage tank are provided on the gas flow path; The obtaining of the concentration parameter of the gas in the battery cell comprises: Controlling the first valve and the valve of the gas storage tank to open and maintain a second preset time length, so that the gas in the battery cell enters the gas storage tank; Obtain the concentration parameters on the gas detection analyzer.

9. The battery refilling control method according to claim 7, characterized in that: The step of controlling the vacuum pumping device to vacuum the interior of the battery cell until a vacuum qualification condition is met includes: Controlling the first valve to open and the valve of the gas storage tank to close; The vacuuming device is controlled to operate to vacuumize, and the vacuuming is maintained for a third preset time period until a vacuum qualification condition is met.

10. A battery refilling control device, characterized in that: The battery refilling control device includes: a memory, a processor, and a battery refilling control program stored in the memory and executable on the processor. When the battery refilling control program is executed by the processor, the steps of the battery refilling control method according to any one of claims 6 to 9 are implemented.

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