Battery formation liquid supplementing tool and formation equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery formation liquid supplementing tool and formation device.The battery formation liquid supplementing tool comprises a weighing assembly, a liquid storage tank, a first pipeline, a three-way valve, a second pipeline and a third pipeline, and the weighing assembly is used for weighing before and after battery formation; the liquid storage tank is used for storing electrolyte; one end of the first pipeline is communicated with the liquid storage tank; the three-way valve is provided with a first runner port, a second runner port and a third runner port, and the first runner port is communicated with the other end of the first pipeline; one end of the second pipeline is communicated with the second runner opening, and the other end is communicated with a liquid injection opening of the battery; one end of the third pipeline is communicated with the third runner opening, and the other end is communicated with negative pressure equipment. By adding the weighing assembly at the pre-charging station, the liquid loss amount of the battery in the formation stage can be automatically metered, and by arranging the first pipeline, the second pipeline and the third pipeline, the battery can be supplemented with liquid at the pre-charging station, and the process of transferring the battery to a liquid supplementing station is omitted.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery formation replenishing liquid tooling and a formation device. Background Art

[0002] In the production process route of lithium-ion power batteries, generally, after pre-charging, secondary liquid injection is carried out. That is, after the electrode group is put into the shell and welded and assembled into a dry battery cell, primary liquid injection is carried out, then pre-charging is carried out, and after the pre-charging is completed, secondary liquid injection differential replenishing liquid is carried out until the final liquid retention amount designed for the battery cell. These electrolytes support the battery cell to perform cyclic charge and discharge.

[0003] To improve the cyclic performance of the battery cell, some battery cells use two kinds of electrolytes for liquid injection before and after pre-charging respectively, that is, the electrolyte models for primary liquid injection and secondary liquid injection are different. The main additive of the electrolyte for primary liquid injection is an SEI film forming additive, and an additive for improving cyclic performance is added to the electrolyte for secondary liquid injection. The two additives may affect each other, so two kinds of electrolytes are used for liquid injection before and after pre-charging respectively; in addition, when the electrolyte for primary liquid injection is fully injected as designed for the battery cell, the equipment capacity and the battery cell wetting capacity cannot be fully matched. When the primary liquid injection ratio is 100%, the battery cell will have a liquid overflow problem. Only relying on the positive and negative pressure circulation of the liquid injection equipment cannot make the battery cell fully wet in a short time. Based on the problem that the electrolyte is lost during the pre-charging process of the current battery cell, if a large amount of the electrolyte for primary liquid injection is lost during the pre-charging process (the liquid loss amount > 1% of the liquid injection amount), the battery cell needs to be transferred to the primary liquid injection process for replenishing liquid operation, and after the replenishing liquid is completed, secondary liquid injection is carried out.

[0004] Since the liquid injection equipment only supports single liquid injection with one kind of electrolyte and cannot simultaneously meet the composite liquid injection of two kinds of electrolytes with one device, the battery cell needs to be transferred to the primary liquid injection process for replenishing liquid operation, and after the replenishing liquid is completed, secondary liquid injection is carried out. This increases the risk caused by uncontrollable factors during the transfer process, resulting in abnormal battery cell quality, low yield or customer complaint problems. At the same time, it also affects the efficiency in the battery cell production process, and increases the equipment cost, the factory building site, and the labor and time costs for transfer. Utility Model Content

[0005] The present application provides a battery formation replenishing liquid tooling and a formation device to solve the problem that in the prior art, after the battery formation is completed, the battery needs to be transferred to the replenishing liquid station for replenishing liquid, resulting in abnormal battery cell quality and low yield.

[0006] On the one hand, the present application provides a battery formation replenishing liquid tooling, including:

[0007] A weighing assembly for weighing the battery before and after formation respectively;

[0008] A liquid storage tank for storing electrolyte;

[0009] The first pipeline, one end of the first pipeline is communicated with the liquid storage tank;

[0010] The three-way valve has a first flow port, a second flow port and a third flow port. The first flow port is communicated with the other end of the first pipeline;

[0011] The second pipeline, one end of the second pipeline is communicated with the second flow port, and the other end is communicated with the liquid injection port of the battery;

[0012] The third pipeline, one end of the third pipeline is communicated with the third flow port, and the other end is communicated with the negative pressure device.

[0013] In a possible design, the tooling further includes a buffer cup which has an air inlet and an air outlet. The air inlet is communicated with the other end of the third pipeline, and the air outlet is communicated with the negative pressure device.

[0014] In a possible design, the buffer cup further has a reflux port. The reflux port is communicated with the second pipeline through a reflux pipeline, and a reflux valve is arranged on the reflux pipeline.

[0015] In a possible design, the tooling further includes a plug which is installed at the other end of the second pipeline. A flow channel is arranged inside the plug and is communicated with the other end of the second pipeline.

[0016] In a possible design, the tooling further includes a moving seat which is used for installing the second pipeline. The moving seat can make the plug block / avoid the liquid injection port of the battery by approaching / leaving the battery.

[0017] In a possible design, the tooling further includes:

[0018] The positive probe is installed on the moving seat. The positive probe can be connected / disconnected from the positive electrode post of the battery under the drive of the moving seat;

[0019] The negative probe is installed on the moving seat. The negative probe can be connected / disconnected from the negative electrode post of the battery under the drive of the moving seat.

[0020] In a possible design, the weighing assembly includes:

[0021] The forming platform is used for placing the battery;

[0022] The weight sensor is arranged on the forming platform and is used for weighing the battery before and after formation respectively.

[0023] In a possible design, the tooling further includes a liquid preparation tank. The liquid inlet of the liquid preparation tank is communicated with the liquid outlet of the liquid storage tank through a liquid preparation pipeline. A liquid preparation valve is arranged on the liquid preparation pipeline. The liquid outlet of the liquid preparation tank is communicated with one end of the first pipeline.

[0024] In a possible design, the negative pressure device is a vacuum pump.

[0025] On the other hand, the present application also provides a formation device, including the battery formation liquid replenishment tooling as described above.

[0026] The beneficial effects of the present application are as follows:

[0027] The battery formation liquid replenishment tooling of the present application can automatically measure the liquid loss of the battery during the formation stage by adding a weighing component at the pre-charging station. By setting the first pipeline, the second pipeline and the third pipeline, it is possible to replenish the battery at the pre-charging station, eliminating the process of transferring the battery to the liquid replenishment station, thereby reducing equipment costs, factory floor space and transfer costs, and reducing the probability of abnormal electrochemical cycling performance and rate performance caused by excessive moisture during the transfer of the battery cores, etc., further improving and ensuring product quality.

[0028] Specifically, by setting the second pipeline, the second pipeline is connected to the liquid injection port of the battery. When the second pipeline is connected to the third pipeline, the battery is formed, and the gas generated during the battery formation process can be exported through the second pipeline and the third pipeline in sequence; when the first pipeline is connected to the second pipeline, the electrolyte in the liquid storage tank can be supplemented into the battery through the first pipeline and the second pipeline in sequence. Thus, the automatic measurement of the liquid loss at the pre-charging station and the replenishment of the primary injection electrolyte are realized by using this tooling.

[0029] The formation device provided by the present application includes all the above advantages of the battery formation liquid replenishment tooling of the present application because it includes the battery formation liquid replenishment tooling of the present application. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of the battery formation liquid replenishment tooling provided by the embodiment of the present application;

[0032] Reference Signs:

[0033] 100. Weighing component; 110. Formation platform; 120. Weight sensor; 200. Liquid storage tank; 310. Reserve liquid tank; 320. Reserve liquid pipeline; 330. Reserve liquid valve; 410. First pipeline; 420. Second pipeline; 430. Third pipeline; 500. Three-way valve; 610. Buffer cup; 611. Air inlet; 612. Air outlet; 613. Return port; 620. Return pipeline; 630. Return valve; 700. Plug; 810. Moving seat; 820. Positive probe; 830. Negative probe; 900. Negative pressure device. Detailed implementation manners

[0034] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0035] The following combines Figure 1 , to describe the battery formation liquid replenishment tooling provided in the embodiments of the present application. The battery formation liquid replenishment tooling includes a weighing component 100, a liquid storage tank 200, a first pipeline 410, a three-way valve 500, a second pipeline 420 and a third pipeline 430. The weighing component 100 is used to weigh the battery before and after formation respectively; the liquid storage tank 200 is used to store electrolyte; one end of the first pipeline 410 is communicated with the liquid storage tank 200; the three-way valve 500 has a first flow port, a second flow port and a third flow port, and the first flow port is communicated with the other end of the first pipeline 410; one end of the second pipeline 420 is communicated with the second flow port, and the other end is communicated with the liquid injection port of the battery; one end of the third pipeline 430 is communicated with the third flow port, and the other end is communicated with the negative pressure device 900. In some specific embodiments, the weighing component 100 includes a formation platform 110 and a weight sensor 120. The formation platform 110 is used to place the battery; the weight sensor 120 is arranged on the formation platform 110. The weight of the battery on the formation platform 110 can be obtained through the weight sensor 120, so that by weighing the battery before and after formation respectively, the liquid loss amount during the battery formation can be obtained, providing a data basis for liquid replenishment. In some specific embodiments, the negative pressure device 900 is a vacuum pump. By connecting the third pipeline 430 with the negative pressure device 900, a negative pressure environment can be formed in the second pipeline 420 and the third pipeline 430, which is beneficial to the discharge of the gas inside the battery. In some specific embodiments, an injection pump is installed on the first pipeline 410, and the injection pump can pump the electrolyte in the liquid storage tank 200 into the first pipeline 410.

[0036] By using the technical solution provided in the above embodiments, by adding a weighing component 100 at the pre-charging station, the liquid loss of the battery during the formation stage can be automatically measured; by setting the first pipeline 410, the second pipeline 420 and the third pipeline 430, the second pipeline 420 is communicated with the liquid injection port of the battery, and at the pre-charging station, not only can the battery be formed, but also the formed battery can be replenished with liquid at the pre-charging station; thus, the process of transferring the battery to the replenishing station is omitted, the equipment cost, the factory site and the transfer cost can be reduced, and the probability problems such as abnormal electrochemical cycling performance and rate performance caused by excessive moisture during the transfer process of the battery core can be reduced, and the product quality can be further improved and guaranteed.

[0037] When pre-charging the battery, adjust the three-way valve 500 to connect the second pipeline 420 with the third pipeline 430, and then start the formation equipment, such as a dense multi-point constant current charging cabinet, to pre-charge the battery. During the pre-charging, start the negative pressure equipment 900. Under the negative pressure environment, the gas generated during the pre-charging process of the battery is sequentially discharged through the second pipeline 420 and the third pipeline 430;

[0038] When the pre-charging of the battery is completed, adjust the three-way valve 500 to connect the first pipeline 410 with the second pipeline 420. Under the action of the liquid injection pump, the electrolyte in the liquid storage tank 200 is sequentially supplemented into the battery through the first pipeline 410, the second pipeline 420 and the liquid injection port of the battery, so as to realize automatic measurement of the liquid loss and automatic replenishment of the injection electrolyte at the pre-charging station.

[0039] Refer to Figure 1 As shown, in some embodiments provided in the present application, the tooling further includes a buffer cup 610. The buffer cup 610 has an air inlet 611 and an air outlet 612. The air inlet 611 is communicated with the other end of the third pipeline 430, and the air outlet 612 is communicated with the negative pressure equipment 900. It should be noted that during the pre-charging stage of the battery, while the gas in the battery is extracted through the second pipeline 420 and the third pipeline 430, there will also be some electrolyte emerging from the liquid injection port in the battery, which will also be extracted along with the gas under the action of negative pressure through the second pipeline 420 and the third pipeline 430. By adding a buffer cup 610 between the end of the third pipeline 430 and the negative pressure equipment 900, the electrolyte emerging from the liquid injection port of the battery can be recovered into the buffer cup 610. After the pre-charging of the battery is completed, the electrolyte in the buffer cup 610 can be sent into the battery again, without wasting the electrolyte.

[0040] Refer to Figure 1As shown, in some embodiments provided by the present application, the buffer cup 610 further has a reflux port 613. The reflux port 613 is communicated with the second pipeline 420 through a reflux pipeline 620, and a reflux valve 630 is arranged on the reflux pipeline 620. Specifically, the reflux port 613 is opened below the buffer cup 610, and the air inlet 611 and the air outlet 612 are respectively oppositely opened on the side wall of the buffer cup 610, so that while the gas flows through the buffer cup 610, the electrolyte in the gas can be collected in the buffer cup 610. In some specific embodiments, the position of the buffer cup 610 is higher than the part of the third pipeline 430 close to the second pipeline 420, so that the electrolyte in the buffer cup 610 can flow back to the battery finally through the reflux pipeline 620, the third pipeline 430, and the second pipeline 420 under the action of gravity. Specifically, when the battery is pre-charged, the reflux valve 630 is closed, and the gas is discharged through the second pipeline 420, the third pipeline 430, the air inlet 611 of the buffer cup 610, and the air outlet 612 of the buffer cup 610, and the electrolyte in the gas stays at the bottom of the buffer cup 610; when the battery pre-charging is completed, the negative pressure device 900 is closed, the reflux valve 630 is opened, and the electrolyte at the bottom of the buffer cup 610 automatically flows back to the battery through the reflux pipeline 620, the third pipeline 430, and the second pipeline.

[0041] Referring to Figure 1 As shown, in some embodiments provided by the present application, the tooling further includes a plug 700. The plug 700 is installed at the other end of the second pipeline 420, and a flow channel is arranged inside the plug 700. The flow channel is communicated with the other end of the second pipeline 420. By installing the plug 700 at the end of the third pipeline 430, while blocking the liquid injection port of the battery to prevent electrolyte leakage, the communication between the second pipeline 420 and the liquid injection port of the battery can be always maintained.

[0042] Referring to Figure 1 As shown, in some embodiments provided by the present application, the tooling further includes a moving seat 810. The moving seat 810 is used to install the second pipeline 420, and the moving seat 810 can block / avoid the liquid injection port of the battery by approaching / leaving the battery. In some specific embodiments, guide rails are respectively arranged on the left and right sides of the moving seat 810. The length direction of the guide rails is consistent with the height direction of the battery. The moving seat 810 can move along the guide rails under the action of a driving motor. Specifically, the moving seat 810 moves downward to approach the battery until the plug 700 abuts against the liquid injection port of the battery, so as to block the liquid injection port of the battery; the moving seat 810 moves upward to leave the battery, so that the plug 700 is separated from the liquid injection port of the battery, so that the battery can be removed from the forming platform 110.

[0043] In some of these specific embodiments, the tooling further includes a positive probe 820 and a negative probe 830. The positive probe 820 is installed on the moving seat 810, and the positive probe 820 can be connected to / disconnected from the positive electrode post of the battery under the drive of the moving seat 810; the negative probe 830 is installed on the moving seat 810, and the negative probe 830 can be connected to / disconnected from the negative electrode post of the battery under the drive of the moving seat 810. Specifically, the positive probe 820 and the negative probe 830 are respectively connected to the positive terminal and the negative terminal of the formation equipment. When the moving seat 810 moves downward and approaches the battery until the plug 700 abuts against the liquid injection port of the battery, the positive probe 820 and the negative probe 830 respectively contact the positive electrode post and the negative electrode post of the battery to achieve electrical connection; when the moving seat 810 moves upward and away from the battery, the positive probe 820 and the negative probe 830 do not contact the positive electrode post and the negative electrode post of the battery respectively.

[0044] Referring to Figure 1 As shown, in some embodiments provided by the present application, the tooling further includes a liquid preparation tank 310. The liquid inlet of the liquid preparation tank 310 is communicated with the liquid outlet of the liquid storage tank 200 through a liquid preparation pipeline 320. A liquid preparation valve 330 is provided on the liquid preparation pipeline 320, and the liquid outlet of the liquid preparation tank is communicated with one end of the first pipeline 410. By adding a liquid preparation tank between the liquid storage tank 200 and the first pipeline 410, after the battery formation is completed, according to the mass difference of the battery measured by the weight sensor 120 before and after formation, the injection pump and the liquid preparation valve 330 are opened, and the corresponding mass of electrolyte is stored in the liquid preparation tank 310 through the liquid preparation pipeline 320.

[0045] The working process of the battery formation and liquid replenishment tooling provided in the embodiments of the present application:

[0046] Record the weight of the battery measured by the weight sensor 120 before formation;

[0047] Adjust the three-way valve 500 to connect the second pipeline 420 and the third pipeline 430, turn on the negative pressure device 900, and start the formation equipment to pre-charge the battery. The gas generated during the battery pre-charging process is discharged through the second pipeline 420, the third pipeline 430, the air inlet 611 of the buffer cup 610, and the air outlet 612 of the buffer cup 610 in sequence, and the electrolyte in the gas stays at the bottom of the buffer cup 610;

[0048] Turn off the negative pressure device 900, open the reflux valve 630, and the electrolyte in the buffer cup 610 flows back into the battery through the reflux pipeline 620, the third pipeline 430, and the second pipeline 420;

[0049] Record the weight of the battery measured by the weight sensor 120 after formation, and calculate the liquid loss of the battery during the formation stage;

[0050] Turn on the liquid injection pump and the liquid injection valve. According to the calculated liquid loss, pump a part of the electrolyte in the liquid storage tank 200 into the liquid preparation tank 310. After supplementing the corresponding volume of electrolyte to the liquid preparation tank 310, turn off the liquid injection pump and the liquid injection valve;

[0051] Adjust the three-way valve 500 to connect the first pipeline 410 with the second pipeline 420. The electrolyte in the liquid preparation tank is sequentially supplemented into the battery through the first pipeline 410, the second pipeline 420, and the liquid injection port of the battery, so as to realize the pre-charging of the battery, the automatic measurement of the liquid loss, and the automatic supplementary injection of electrolyte at the pre-charging station.

[0052] In the embodiment of the present application, a formation device is further provided, including the battery formation liquid supplementing tooling in the above embodiment.

[0053] It should be noted that the formation device includes the battery formation liquid supplementing tooling, and thus includes all the above advantages of the battery formation liquid supplementing tooling, which will not be elaborated here.

[0054] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and 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 thus should not be construed as a limitation to the present application.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean 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 this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A battery formation replenishing liquid tooling, characterized in that, Comprising: A weighing assembly for weighing the battery before and after formation respectively; A liquid storage tank for storing electrolyte; A first pipeline, one end of the first pipeline is communicated with the liquid storage tank; A three-way valve having a first flow port, a second flow port and a third flow port, the first flow port is communicated with the other end of the first pipeline; A second pipeline, one end of the second pipeline is communicated with the second flow port, and the other end is communicated with the liquid injection port of the battery; A third pipeline, one end of the third pipeline is communicated with the third flow port, and the other end is communicated with a negative pressure device; 2. The battery formation liquid replenishment tooling according to claim 1, wherein: Further comprising a buffer cup having an air inlet and an air outlet, the air inlet is communicated with the other end of the third pipeline, and the air outlet is communicated with the negative pressure device; 3. The battery formation replenishing liquid tooling according to claim 2, characterized in that: The buffer cup further has a reflux port, the reflux port is communicated with the second pipeline through a reflux pipeline, and a reflux valve is arranged on the reflux pipeline; 4. The battery formation liquid supplementing tooling according to any one of claims 1-3, characterized in that: Further comprising a plug installed at one end of the second pipeline close to the battery, and a flow channel is arranged inside the plug, and the flow channel is communicated with the second pipeline; 5. The battery formation liquid supplementing tooling according to claim 4, characterized in that: Further comprising a moving seat for installing the second pipeline, and the moving seat can block / avoid the liquid injection port of the battery by approaching / leaving the battery; 6. The battery formation liquid supplementing tooling according to claim 5, wherein, Further comprising: A positive electrode probe installed on the moving seat, and the positive electrode probe can be connected / disconnected from the positive electrode column of the battery driven by the moving seat; A negative electrode probe installed on the moving seat, and the negative electrode probe can be connected / disconnected from the negative electrode column of the battery driven by the moving seat; 7. The battery formation liquid replenishment tooling according to claim 1, wherein, The weighing assembly includes: A formation platform for placing the battery; A weight sensor arranged on the formation platform for weighing the battery before and after formation respectively; 8. The battery formation liquid replenishment tooling according to claim 1, characterized in that: Further comprising a prepared liquid tank, the liquid inlet of the prepared liquid tank is communicated with the liquid outlet of the liquid storage tank through a prepared liquid pipeline, a prepared liquid valve is arranged on the prepared liquid pipeline, and the liquid outlet of the prepared liquid tank is communicated with one end of the first pipeline; 9. The battery formation replenishing liquid tooling according to claim 1, wherein The negative pressure device is a vacuum pump; 10. A forming device, characterized in that: Including the battery formation liquid supplement tooling according to any one of claims 1-9.

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