Detection device and detection method
By combining the cooled agglomerate, negative pressure and weighing structure in the battery detection device, the accuracy of the electrolyte loss detection after the negative pressure of the battery is reduced, and the precise fluid replenishment of each cavity of the battery is achieved to ensure the stability of the battery performance.
Patent Information
- Application Number
- CN202311597105.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-27
- Publication Date
- 2025-05-27
AI Technical Summary
The prior art cannot accurately detect the liquid loss of the electrolyte in each cavity after the negative pressure of the battery is transformed, resulting in the inability to achieve accurate liquid replenishment during secondary injection, which affects the performance of the battery performance.
A detection device is provided, including a cooled agglomerate structure, a negative pressure structure and a weighing structure. The electrolyte is condensed into liquid state and collected through the cooled agglomerate structure. The negative pressure structure extracts gas and liquid in the cavity, and the weighing structure measures the mass of the liquid collecting cup, and then calculates the liquid loss of the electrolyte.
It realizes accurate detection of the liquid loss of electrolyte in each cavity of the battery, ensuring accurate rehydration during secondary injection, and ensuring that the battery performance meets the design requirements.
Smart Images
Figure CN120043898A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of battery manufacturing, and particularly relates to a detection device and an operation method thereof. Background Art
[0002] Formation is to charge and discharge the injected battery for activation, which is a process in which the electrolyte and additives undergo chemical reactions on the surface of the electrode active material under certain temperature and voltage conditions. Formation generates a passivation film on the electrode surface, which can prevent the oxidation-reduction reaction between the electrolyte and the electrode active material and ensure the electrochemical stability of the battery.
[0003] In recent years, blade batteries (cells) have received increasing attention in the market due to their high safety and low cost. Among them, double-chamber blade batteries have greater market prospects due to their high voltage. The traditional single-chamber battery negative pressure formation adopts a way of collecting liquid under negative pressure through a bus bar, which cannot meet the requirement of detecting the liquid loss of the electrolyte in each chamber of the double-chamber blade battery. Therefore, it is impossible to accurately replenish the liquid during secondary injection, and it cannot ensure that the liquid retention of the battery meets the design requirements, thus affecting the performance of the battery during use. Therefore, how to accurately detect the liquid loss during the negative pressure formation of the battery is an urgent problem to be solved. Summary of the Invention
[0004] The embodiments of the present application provide a battery formation liquid loss detection device and an operation method thereof to solve the problem that the prior art cannot accurately detect the liquid loss during the negative pressure formation of the battery.
[0005] On the one hand, the embodiments of the present application provide a detection device for detecting the liquid loss of the electrolyte of the battery after formation, including:
[0006] A condensation liquid collection structure, which includes a condenser for communicating with the internal cavity of the battery and a liquid collection cup communicating with the condenser and used for collecting the condensed liquid of the condenser;
[0007] A negative pressure structure for pumping the gas and / or liquid in the cavity into the condenser; and
[0008] A weighing structure for measuring the mass of the liquid collection cup.
[0009] In some embodiments, the battery has at least two such cavities, and the number of the condensation liquid collection structures is the same as and corresponds one by one to the number of the cavities.
[0010] In some embodiments, a buffer cup is provided between the condenser and the cavity.
[0011] In some embodiments, the buffer cup is communicated with the liquid injection hole of the battery.
[0012] In some embodiments, the condenser is communicated with the liquid injection hole of the battery through a negative pressure pipe.
[0013] In some embodiments, the negative pressure structure includes a vacuum pump.
[0014] Another aspect of the embodiments of the present application provides a detection method, using the detection device described in any one of the above embodiments. The detection method includes the following steps:
[0015] Step 1: Determine the mass m1 of the liquid collecting cup before the battery formation.
[0016] Step 2: Determine the mass m2 of the liquid collecting cup after the battery formation.
[0017] Step 3: Determine the electrolyte loss amount in the cavity according to the mass m1 and the mass m2.
[0018] In some embodiments, Step 1 is specifically: determining the mass m1 of the liquid collecting cup before the battery formation through a weighing structure.
[0019] In some embodiments, Step 2 is specifically: determining the mass m2 of the liquid collecting cup after the battery formation through a weighing structure.
[0020] In some embodiments, Step 3 is specifically: the electrolyte loss amount is the difference between the mass m2 and the mass m1.
[0021] Compared with the prior art, the present application has the following advantages:
[0022] The detection device provided by the embodiments of the present application separately discharges the gas generated by the electrolyte in each cavity inside the battery and the electrolyte carried out during the negative pressure formation of the battery; then, the discharged electrolyte is sucked into the condenser corresponding to each cavity, and after being condensed into a liquid state, it enters the liquid collecting cup corresponding to each cavity; a separate weighing platform is arranged at the lower part of each liquid collecting cup, and the formation liquid loss amount of each cavity of the battery is calculated through the weighing reading increment before and after each battery formation.
[0023] Through the above solution, it can be ensured that for the battery, especially the double-cavity battery, after the negative pressure formation, the electrolyte loss amount of each cavity of the battery is separately detected and measured, and thus accurate liquid replenishment for each cavity of the battery can be realized during the secondary liquid injection. Description of the Drawings
[0024] Figure 1 is a schematic structural diagram of the detection device provided by an embodiment of the present application;
[0025] Explanation of the reference numerals in the drawings:
[0026] 1. Battery, 1-1 First cavity, 1-2 Second cavity; 2. Buffer cup; 3. Negative pressure tube; 4. Condensation liquid collection structure, 41. Condenser, 42. Liquid collection cup; 5. Weighing structure; 6. Negative pressure structure. Detailed implementation manner
[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementations disclosed below.
[0028] In the description of the present application, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.
[0029] If there is a description of the first, second, etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.
[0030] In the description of the present application, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.
[0031] In the description of the present application, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application.
[0032] See Figure 1 As shown, the embodiment of the present application discloses a detection device, which is applicable to the detection of the loss of electrolyte in the battery after negative pressure formation, and is particularly applicable to the detection of the loss of electrolyte in each cavity of a double-cavity blade battery after negative pressure formation. The detection device includes a condensation liquid collection structure 4, and the condensation liquid collection structure 4 includes a condenser 41 for communicating with the internal cavity of the battery, and a liquid collection cup 42 communicating with the condenser 41 and used for collecting the condensed liquid in the condenser 41.
[0033] In order to pump the gas and liquid in the cavity into the condenser 41, the detection device of this embodiment further includes a negative pressure structure 6.
[0034] To detect the loss of electrolyte caused by negative pressure formation, the detection device further includes a weighing structure 5 for measuring the weight of the liquid collection cup 42.
[0035] In summary, in this embodiment, by setting a weighing structure to detect the change in the weight of the liquid collection cup before and after battery formation, the change in the electrolyte volume in each cavity of the battery is obtained, and the accurate loss of liquid in each cavity of the battery is determined. Furthermore, accurate liquid replenishment for each cavity of the battery can be achieved during secondary liquid injection, thereby ensuring that the performance of the battery can meet the design requirements.
[0036] In one or some embodiments, the battery 1 has at least two cavities 1-1 and 1-2 inside, and the number of the condensation liquid collection structures is the same as and corresponds one-to-one to the number of each cavity.
[0037] Specifically, in some optional implementation examples, continue to refer to Figure 1 As shown, the battery 1 is a dual-cavity battery, especially a dual-cavity blade battery. The inside of each battery 1 includes two cavities, namely the first cavity 1-1 and the second cavity 1-2. To calculate the loss of electrolyte in each cavity, the number of the condensation liquid collection structures 4 is the same as the total number of the first cavity 1-1 and the second cavity 1-2, and each condensation liquid collection structure 4 corresponds one-to-one to each cavity.
[0038] Optionally, continue to refer to Figure 1 As shown, a weighing structure 5 is respectively arranged below each liquid collection cup 42. The weighing structure 5 includes a weighing platform, so as to weigh the liquid collection cup 42 individually.
[0039] By configuring a separate weighing platform at the lower part of the liquid collection cup 42, the loss of electrolyte in each cavity of the battery 1 is calculated through the incremental weighing readings before and after each battery formation. By weighing the loss of electrolyte in each cavity of each battery 1 in-situ online, the loss of electrolyte in each cavity of the battery 1 is calculated separately.
[0040] Through this embodiment, a set of liquid loss collection devices for separate drainage, condensation, and liquid collection is configured for each single cavity of the battery 1 with negative pressure formation, which can realize separate collection of the liquid loss of each cavity of the battery, without the risk of cross-contamination, and the liquid loss corresponds accurately to each cavity respectively, creating conditions for accurate liquid replenishment.
[0041] In one or some embodiments, a buffer cup 2 is provided between the condenser 41 and the cavity.
[0042] Among them, the buffer cup 2 is arranged above the battery 1, and the electrolyte carried out by the gas generated during the formation of the electrolyte in each cavity of the battery 1 is separately discharged through the buffer cup 2; the upper end of the buffer cup 2 is connected to one end of the negative pressure pipe 3; on the negative pressure pipe 3, a condenser 41 is optionally connected at the middle position of the negative pressure pipe 3, and a liquid collecting cup 42 is connected below the condenser 41, so that the discharged electrolyte is sucked into the condenser 4 through the negative pressure pipe 3 and then condensed into a liquid state and enters the liquid collecting cup 42; the other end of the negative pressure pipe 3 is connected to a negative pressure structure 6, and the negative pressure structure 6 is used to form a negative pressure in the negative pressure pipe 3 and drive the flow of the gas or gas-liquid mixture generated during the formation by means of suction.
[0043] In one or some embodiments, the buffer cup 2 communicates with the liquid injection hole of the battery 1.
[0044] Optionally, the buffer cup 2 is connected to the liquid injection hole on the battery 1 through a negative pressure nozzle. In the case where the battery 1 has a double cavity, a liquid injection hole is provided for each cavity, and a negative pressure nozzle and a buffer cup 2 are respectively provided on each liquid injection hole, so as to detect the liquid loss amount of each cavity respectively.
[0045] In one or some embodiments, see Figure 1 As shown, the condenser 41 communicates with the liquid injection holes of each cavity of the battery 1 through the negative pressure pipe 3.
[0046] Specifically, each condenser 41 is respectively connected to a certain cavity of a battery 1 through a single negative pressure pipe 3. Optionally, a buffer cup 2 is also communicated with the negative pressure pipe 3. Through the buffer cup 2, it is easier to centrally receive the electrolyte formed, and the operation time and cost of the negative pressure structure and the condensation system are reduced.
[0047] In one or some embodiments, the negative pressure structure 6 includes a vacuum pump, so that by using the suction effect of the vacuum pump and the negative pressure pipe 3, the fluid in the buffer cup 2 enters the condenser 41 and then converges into the liquid collecting cup 42.
[0048] In some optional implementation examples, a gas treatment unit is provided in the negative pressure structure 6 for decomposing and treating the electrolyte to reduce the erosion of the equipment and the pollution of the environment.
[0049] Optionally, in some implementation examples, the battery 1 and the buffer cup 2 are arranged on the storage side of the formation equipment, while the condenser 41, the liquid collecting cup 42 and the negative pressure structure 6 are arranged on the power supply side of the formation equipment. By arranging them on different sides, it is convenient for operation and improves the safety and maintainability of the formation equipment.
[0050] In some embodiments, the battery 1 is placed on the storage of the formation equipment through a tray, which further improves the operability and safety.
[0051] Another embodiment of the present application provides a detection method for detecting according to the detection device in any of the above embodiments, for detecting the liquid loss amount in each cavity of the battery. The detection method includes the following steps:
[0052] Step 1: Determine the mass m1 of the liquid collection cup 42 before formation.
[0053] Step 2: Determine the mass m2 of the liquid collection cup 42 after formation.
[0054] Step 3: Determine the electrolyte liquid loss amount in the cavity according to the mass m1 and the mass m2.
[0055] In one or some embodiments, Step 1 is specifically: determining the mass m1 of the liquid collection cup before formation through the weighing structure 5, where the weighing structure 5 includes a weighing platform.
[0056] In one or some specific embodiments, Step 2 is specifically: determining the mass m2 of the liquid collection cup after formation through the weighing structure 5.
[0057] In one or some embodiments, Step 3 is specifically: the electrolyte liquid loss amount is the difference between the mass m2 and the mass m1.
[0058] Specifically, before Step 1, the following steps are further included:
[0059] Step 110, obtain the battery 1 to be formed, place the battery 1 in the formation tray, and place it in the storage location of the formation device;
[0060] Step 120, connect the buffer cup 2 above the battery 1;
[0061] Step 130, use the negative pressure pipe 3 to connect the buffer cup 2 with the condenser 41, the liquid collection cup 42 and the negative pressure structure 6 on the power supply side of the formation device. A weighing structure 5 is further provided below each liquid collection cup 42.
[0062] In some embodiments, after the above Step 3, the detection method further includes:
[0063] Step 140, supplement the corresponding mass of electrolyte to the corresponding battery cavity (1-1, 1-2) according to the liquid loss amount.
[0064] In an optional specific embodiment, the steps of performing detection using the detection device disclosed in the embodiments of the present invention include: placing the to-be-formed dual-chamber battery 1 in a forming tray and placing it in a forming equipment storage location. Under negative pressure, the buffer cup 2 is pressed down, and the pressing and close connection with the liquid injection hole of the battery 1 is achieved through a negative pressure suction nozzle. Each chamber of the dual-chamber battery 1 is matched with a set of independent condensate collection structures 4, preferably including a buffer cup 2 directly connected to the liquid injection holes of each chamber of the battery. This buffer cup 2 is used to buffer the instantaneously extracted electrolyte, reduce the amount of extracted electrolyte, and extend the service life of the battery; a negative pressure tube 3 connects the buffer cup 2 on the storage location side with the condenser 41 and the negative pressure structure 6 on the power supply side. Mainly through the vacuum pump in the negative pressure structure 6, each chamber of the battery 1 is evacuated to discharge the gas generated during formation; the condenser 41 mainly condenses and retains the electrolyte carried out with the gas generated during formation.
[0065] Then, separate liquid collection and in-situ detection of the liquid loss amount are realized: the condensed electrolyte is separately collected through the liquid collection cup 42 below the condenser 41. At the same time, a corresponding weighing structure 5 is configured below the liquid collection cup 42 to perform on-line weighing of the liquid collection cup 42 in real time. Before the negative pressure formation of the battery 1, the mass m1 of the liquid collection cup 42 corresponding to each channel is weighed first. After the negative pressure formation of the battery 1, the mass m2 of each liquid collection cup 42 is weighed again. Then, the liquid loss amount Δm of the electrolyte in the chamber of the battery 1 corresponding to this channel is Δm = m2 - m1. Then, during the secondary liquid injection, the electrolyte with a mass of Δm is supplemented into the corresponding chamber of the battery 1, so as to achieve accurate liquid replenishment of the electrolyte in each chamber of the battery 1 during the secondary liquid injection.
[0066] It should be noted that although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the claims of the present invention.
Claims
1. A detection device for detecting the liquid loss of the battery electrolyte after formation, characterized in that, it includes: A condensation liquid collection structure, which includes a condenser for communicating with the internal cavity of the battery and a liquid collection cup communicating with the condenser and used for collecting the condensed liquid of the condenser; A negative pressure structure, which is used to pump the gas and / or liquid in the cavity into the condenser; and A weighing structure, which is used to measure the mass of the liquid collection cup.
2. The detection device according to claim 1, characterized in that, There are at least two such cavities inside the battery, and the number of the condensation liquid collection structures is the same as and corresponds one by one to the number of the cavities.
3. The detection device according to claim 1, characterized in that, A buffer cup is provided between the condenser and the cavity.
4. The detection device according to claim 3, characterized in that, The buffer cup is communicated with the liquid injection hole of the battery.
5. The detection device according to claim 1, characterized in that, The condenser is communicated with the liquid injection hole of the battery through a negative pressure pipe.
6. The detection device according to claim 1, characterized in that, The negative pressure structure includes a vacuum pump.
7. A detection method using the detection device according to any one of claims 1-6, characterized in that, The detection method includes the following steps: Step 1: Determine the mass m1 of the liquid collection cup before the battery formation; Step 2: Determine the mass m2 of the liquid collection cup after the battery formation; Step 3: Determine the liquid loss of the electrolyte in the cavity according to the mass m1 and the mass m2.
8. The detection method according to claim 7, characterized in that, Specifically, step 1 is: determining the mass m1 of the liquid collection cup before the battery formation through the weighing structure.
9. The detection method according to claim 7, characterized in that, Specifically, step 2 is: determining the mass m2 of the liquid collection cup after the battery formation through the weighing structure.
10. The detection method according to any one of claims 7-9, characterized in that, Specifically, step 3 is: the liquid loss of the electrolyte is the difference between the mass m2 and the mass m1.