CN106159188A - Through type liquid injection method and device for lithium ion battery - Google Patents

Through type liquid injection method and device for lithium ion battery Download PDF

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CN106159188A
CN106159188A CN201610798929.2A CN201610798929A CN106159188A CN 106159188 A CN106159188 A CN 106159188A CN 201610798929 A CN201610798929 A CN 201610798929A CN 106159188 A CN106159188 A CN 106159188A
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liquid injection
ion battery
lithium ion
liquid
injection hole
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CN106159188B (en
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倪世杰
郑浩
张宏立
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Gotion High Tech Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

本发明提供一种锂离子电池贯通式注液方法及装置，其包括在锂离子电池的盖板上开设两个注液孔；将锂离子电池上的两个注液孔分别与电解液罐连接、真空泵连接进行抽真空和注液；使锂离子电池的抽真空操作和注液操作同时进行，当注液量满足要求时，关闭电解液罐，并对电池继续抽真空10‑60s，以排出锂离子电池内部的微气泡，从而能够提高电池的注液效率和保证电池的注液质量。

The invention provides a through-type liquid injection method and device for a lithium ion battery, which comprises opening two liquid injection holes on the cover plate of the lithium ion battery; connecting the two liquid injection holes on the lithium ion battery with the electrolyte tank respectively , the vacuum pump is connected for vacuuming and liquid injection; the vacuuming operation and liquid injection operation of the lithium-ion battery are carried out at the same time. The microbubbles inside the lithium-ion battery can improve the liquid injection efficiency of the battery and ensure the liquid injection quality of the battery.

Description

一种锂离子电池贯通式注液方法及装置Lithium-ion battery penetrating liquid injection method and device

技术领域technical field

本发明涉及一种锂离子电池注液技术，具体涉及一种锂离子电池贯通式注液方法及装置。The invention relates to a lithium-ion battery liquid injection technology, in particular to a lithium-ion battery through-type liquid injection method and device.

背景技术Background technique

锂离子电池的注液技术是影响锂离子电池批量化生产、电池性能和成本控制的一个重要因素。目前，锂离子电池注液原理多采用负压自吸式注液方式，即将电池壳体内部吸成负压，用管路将电池壳体与电解液连接，使电池壳体内部与电解液所在空间之间形成气压差，利用该气压差使电解液自动吸入到电池壳体内部，完成自动注液。一般全自动注液设备采用自动化（PLC）控制，可以定位电池盒与注液模块，精确控制注液量，自动控制工作台的升降、阀门的开关、负压真空度的高低、注液量的多少等，这样就降低了劳动强度、提高了生产效率。但是，负压自吸式注液方法对注液设备的真空度要求较高，且由于只有一个注液孔，要求先对电池抽真空，然后注液，且在电池的内部(特别是电池的四角)容易产生气泡，因此电池注液效率和质量得不到保证。The liquid injection technology of lithium-ion batteries is an important factor affecting the mass production of lithium-ion batteries, battery performance and cost control. At present, the principle of liquid injection of lithium-ion batteries mostly adopts the negative pressure self-priming liquid injection method, that is, the inside of the battery case is sucked into negative pressure, and the battery case is connected with the electrolyte with pipelines, so that the inside of the battery case and the electrolyte are located. An air pressure difference is formed between the spaces, and the electrolyte is automatically sucked into the battery case by using the air pressure difference to complete automatic liquid injection. Generally, automatic liquid injection equipment adopts automation (PLC) control, which can position the battery box and liquid injection module, precisely control the liquid injection volume, and automatically control the lifting of the workbench, the switch of the valve, the level of negative pressure and vacuum, and the liquid injection volume. How much and so on, thus reducing labor intensity and improving production efficiency. However, the negative pressure self-priming liquid injection method requires a higher vacuum degree of the liquid injection equipment, and since there is only one liquid injection hole, it is required to evacuate the battery first, and then inject liquid, and the inside of the battery (especially the battery) Four corners) are prone to air bubbles, so the efficiency and quality of battery liquid injection cannot be guaranteed.

发明内容Contents of the invention

为了克服现有注液设备技术不足，本发明提供一种锂离子电池贯通式注液方法及装置。In order to overcome the technical deficiencies of existing liquid injection equipment, the present invention provides a through-type liquid injection method and device for a lithium ion battery.

一种锂离子电池贯通式注液方法，其包括以下步骤：A kind of lithium-ion battery penetrating liquid injection method, it comprises the following steps:

（1）在锂离子电池的盖板上开设两个注液孔；(1) Open two liquid injection holes on the cover plate of the lithium-ion battery;

（2）将锂离子电池上的两个注液孔分别与电解液罐连接、真空泵连接进行抽真空和注液；(2) Connect the two liquid injection holes on the lithium-ion battery to the electrolyte tank and the vacuum pump for vacuuming and liquid injection;

（3）注液量满足要求时，先关闭电解液罐，真空泵继续工作10-60s，以排出锂离子电池内部的微气泡。(3) When the liquid injection volume meets the requirements, first close the electrolyte tank, and the vacuum pump continues to work for 10-60 seconds to discharge the micro-bubbles inside the lithium-ion battery.

进一步方案，通过连接管将若干个锂离子电池的两个注液孔并联起来，然后再分别与电解液罐、真空泵连接，同时进行抽真空和注液。A further solution is to connect the two liquid injection holes of several lithium-ion batteries in parallel through the connecting pipe, and then connect them to the electrolyte tank and the vacuum pump respectively, and perform vacuuming and liquid injection at the same time.

进一步方案，在注液孔和电解液罐、注液孔和真空泵之间分别设有流量计，通过流量计上差值来得出当前注液量。In a further solution, a flow meter is respectively provided between the liquid injection hole and the electrolyte tank, and between the liquid injection hole and the vacuum pump, and the current liquid injection volume is obtained by the difference between the flow meters.

本发明的另一个发明目的是提供实现上述一种锂离子电池贯通式注液方法的装置，包括锂离子电池和电解液罐，所述锂离子电池的盖板上开设有左注液孔和右注液孔，所述左注液孔通过进液管与电解液罐连接，右注液孔通过出液管与真空泵连接；所述进液管上依次设有进液阀、进液流量计，出液管上依次设有出液流量计和出液阀。Another object of the present invention is to provide a device for implementing the above-mentioned through-type liquid injection method for a lithium ion battery, including a lithium ion battery and an electrolyte tank, and a left liquid injection hole and a right liquid injection hole are opened on the cover plate of the lithium ion battery The liquid injection hole, the left liquid injection hole is connected to the electrolyte tank through the liquid inlet pipe, and the right liquid injection hole is connected to the vacuum pump through the liquid outlet pipe; the liquid inlet pipe is sequentially provided with a liquid inlet valve and a liquid inlet flowmeter, A liquid discharge flowmeter and a liquid discharge valve are sequentially arranged on the liquid discharge pipe.

进一步方案，所述出液阀和真空泵之间设有缓冲罐，所述缓冲罐上设有液位管，缓冲罐底端出口设有排液阀。In a further solution, a buffer tank is provided between the liquid outlet valve and the vacuum pump, a liquid level pipe is provided on the buffer tank, and a liquid discharge valve is provided at the bottom outlet of the buffer tank.

进一步方案，所述进液管与将若干个锂离子电池上的左注液孔进行并联的左连接管连接，每个锂离子电池的左注液孔的入口端均设有左控制阀；所述出液管与将若干个锂离子电池上的右注液孔进行并联的右连接管连接，每个锂离子电池的右注液孔的出口端均设有右控制阀。In a further solution, the liquid inlet pipe is connected to the left connecting pipe connecting the left liquid injection holes on several lithium-ion batteries in parallel, and the inlet end of the left liquid injection hole of each lithium-ion battery is provided with a left control valve; The liquid outlet pipe is connected with the right connecting pipe connecting the right liquid injection holes on several lithium ion batteries in parallel, and the outlet end of the right liquid injection hole of each lithium ion battery is provided with a right control valve.

本发明采用负压贯通式注液法对多个电池进行注液，将具有两个注液孔的电池通过管路“并联”连接，“并联”后一端与电解液罐连接、另一端与真空泵连接，且管路连接中设有控制阀门和流量计，保证各个电池中的注液量一致，无少注和漏注情况的发生。在注液时，开启真空泵后，先对电池内部进行抽真空，然后电解液会沿着管路进入电池内部，这样电池的抽真空操作和注液操作可以同时进行，操作方便且不需更换连接管，大大减少了注液时间。当电池中注液量满足要求时，关闭相应控制阀，并对电池继续抽真空10-60s，将电池中内部的微气泡排出，从而可以保证电池的注液质量。The invention uses a negative pressure penetrating liquid injection method to inject liquid into multiple batteries, and connects the batteries with two liquid injection holes through pipelines in "parallel connection", after "parallel connection", one end is connected to the electrolyte tank, and the other end is connected to the vacuum pump Connection, and there are control valves and flow meters in the pipeline connection to ensure that the liquid injection volume in each battery is consistent, and there is no underfill or leakage. When injecting liquid, after turning on the vacuum pump, first vacuumize the interior of the battery, and then the electrolyte will enter the interior of the battery along the pipeline, so that the vacuuming operation and liquid injection operation of the battery can be carried out at the same time, which is convenient to operate and does not need to replace the connection tube, greatly reducing the injection time. When the amount of liquid injected in the battery meets the requirements, close the corresponding control valve, and continue to vacuum the battery for 10-60 seconds to discharge the microbubbles inside the battery, so as to ensure the quality of liquid injection in the battery.

采用本发明的注液方法，能够提高电池的注液效率和保证电池的注液质量。另外，电池内部的多余电解液和气体被收集在缓冲罐中，其中，气体通过真空泵排出，电解液被收集在缓冲罐中进行重复利用。所以本发明是一种连续注液、注液效率高和电解液无浪费的高效注液技术。By adopting the liquid injection method of the invention, the liquid injection efficiency of the battery can be improved and the liquid injection quality of the battery can be guaranteed. In addition, the excess electrolyte and gas inside the battery are collected in a buffer tank, wherein the gas is discharged through a vacuum pump, and the electrolyte is collected in a buffer tank for reuse. Therefore, the present invention is a high-efficiency liquid injection technology with continuous liquid injection, high liquid injection efficiency and no waste of electrolyte.

附图说明Description of drawings

下面结合附图和实施例对本发明进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

图1是本发明结构示意图，Fig. 1 is a structural representation of the present invention,

图2是本发明中锂离子电池结构示意图。Fig. 2 is a schematic diagram of the structure of the lithium-ion battery in the present invention.

图中：1-电解液罐，2-进液管，3-进液阀，4-左连接管，5-左控制阀，6-进液流量计，7-锂离子电池，7-1左注液口，7-2右注液口，8-出液流量计，9-右控制阀，10-右连接管，11-出液阀，12-出液管，13-缓冲罐，13-1液位管，13-2排液阀，14-真空泵。In the figure: 1-electrolyte tank, 2-inlet pipe, 3-inlet valve, 4-left connecting pipe, 5-left control valve, 6-inlet flowmeter, 7-lithium ion battery, 7-1 left Liquid injection port, 7-2 right liquid injection port, 8-liquid outlet flowmeter, 9-right control valve, 10-right connecting pipe, 11-liquid outlet valve, 12-liquid outlet pipe, 13-buffer tank, 13- 1 level pipe, 13-2 drain valve, 14-vacuum pump.

具体实施方式detailed description

实施例1：对单个电池进行注液：Embodiment 1: Inject liquid into a single battery:

（1）在锂离子电池的盖板上开设两个注液孔；(1) Open two liquid injection holes on the cover plate of the lithium-ion battery;

（2）将锂离子电池上的两个注液孔分别与电解液罐连接、真空泵连接进行抽真空和注液；(2) Connect the two liquid injection holes on the lithium-ion battery to the electrolyte tank and the vacuum pump for vacuuming and liquid injection;

（3）在注液孔和电解液罐、注液孔和真空泵之间分别设有流量计，通过流量计上差值来得出锂离子电池的当前注液量；注液量满足要求时，先关闭电解液罐，真空泵继续工作10s，以排出锂离子电池内部的微气泡。(3) A flow meter is installed between the liquid injection hole and the electrolyte tank, the liquid injection hole and the vacuum pump, and the current liquid injection volume of the lithium-ion battery can be obtained through the difference on the flow meter; when the liquid injection volume meets the requirements, first Close the electrolyte tank, and the vacuum pump continues to work for 10s to discharge the microbubbles inside the lithium-ion battery.

进一步方案，所述左、右连接管上分别设有流量计，通过流量计上差值来计算当前注液量。In a further solution, the left and right connecting pipes are respectively provided with flow meters, and the current liquid injection volume is calculated according to the difference between the flow meters.

实施例2：对多个电池进行注液：Embodiment 2: Liquid injection is carried out to multiple batteries:

（1）在锂离子电池的盖板上开设两个注液孔；(1) Open two liquid injection holes on the cover plate of the lithium-ion battery;

（2）通过连接管将多个锂离子电池的两个注液孔并联起来，然后再分别与电解液罐、真空泵连接，同时进行抽真空和注液；(2) Connect the two liquid injection holes of multiple lithium-ion batteries in parallel through the connecting tube, and then connect them to the electrolyte tank and vacuum pump respectively, and perform vacuum pumping and liquid injection at the same time;

（3）将锂离子电池上的两个注液孔分别与电解液罐连接、真空泵连接进行抽真空和注液；(3) Connect the two liquid injection holes on the lithium-ion battery to the electrolyte tank and the vacuum pump for vacuuming and liquid injection;

（4）在注液孔和电解液罐、注液孔和真空泵之间分别设有流量计，通过流量计上差值来得出锂离子电池的当前注液量；注液量满足要求时，先关闭电解液罐，真空泵继续工作60s，以排出锂离子电池内部的微气泡。(4) A flow meter is installed between the liquid injection hole and the electrolyte tank, the liquid injection hole and the vacuum pump, and the current liquid injection volume of the lithium-ion battery is obtained through the difference on the flow meter; when the liquid injection volume meets the requirements, first Close the electrolyte tank, and the vacuum pump continues to work for 60s to discharge the microbubbles inside the lithium-ion battery.

实施例3：Example 3:

如图1所示，一种锂离子电池贯通式注液装置，包括锂离子电池7和电解液罐1，所述锂离子电池7的盖板上开设有左注液孔7-1和右注液孔7-2，所述左注液孔7-1通过进液管2与电解液罐1连接，右注液孔7-2通过出液管12与真空泵14连接；所述进液管2上依次设有进液阀3、进液流量计6，出液管12上依次设有出液流量计8和出液阀11。As shown in Figure 1, a lithium-ion battery penetrating liquid injection device includes a lithium-ion battery 7 and an electrolyte tank 1, and a left liquid injection hole 7-1 and a right injection hole 7-1 are opened on the cover plate of the lithium-ion battery 7. Liquid hole 7-2, the left liquid injection hole 7-1 is connected with the electrolyte tank 1 through the liquid inlet pipe 2, and the right liquid injection hole 7-2 is connected with the vacuum pump 14 through the liquid outlet pipe 12; the liquid inlet pipe 2 A liquid inlet valve 3 and a liquid inlet flowmeter 6 are sequentially arranged on the top, and a liquid outlet flow meter 8 and a liquid outlet valve 11 are sequentially arranged on the liquid outlet pipe 12 .

进一步方案，所述出液阀11和真空泵14之间设有缓冲罐13，所述缓冲罐13上设有液位管13-1，缓冲罐13底端出口设有排液阀13-2。In a further solution, a buffer tank 13 is provided between the liquid outlet valve 11 and the vacuum pump 14, a liquid level pipe 13-1 is provided on the buffer tank 13, and a liquid discharge valve 13-2 is provided at the bottom outlet of the buffer tank 13.

进一步方案，所述进液管2与将若干个锂离子电池7上的左注液孔7-1进行并联的左连接管4连接，每个锂离子电池7的左注液孔7-1的入口端均设有左控制阀5；所述出液管12与将若干个锂离子电池7上的右注液孔7-2进行并联的右连接管10连接，每个锂离子电池7的右注液孔7-2的出口端均设有右控制阀9。In a further solution, the liquid inlet pipe 2 is connected to the left connecting pipe 4 that connects the left liquid injection holes 7-1 on several lithium ion batteries 7 in parallel, and the left liquid injection holes 7-1 of each lithium ion battery 7 The inlet port is provided with a left control valve 5; the liquid outlet pipe 12 is connected with the right connection pipe 10 that connects the right liquid injection holes 7-2 on several lithium ion batteries 7 in parallel, and the right side of each lithium ion battery 7 The outlet ends of the injection holes 7-2 are provided with right control valves 9 .

进液管2、出液管12、左连接管4、右连接管10均为软管。The liquid inlet pipe 2, the liquid outlet pipe 12, the left connecting pipe 4, and the right connecting pipe 10 are flexible pipes.

电池注液时应保证进液阀3、左控制阀5、右控制阀9和出液阀11均开启，使电解液罐1、锂离子电池7、缓冲罐13和真空泵14保持贯通状态。开启真空泵14，先将锂离子电池7内部的气体抽出，此时，由于压差，会有电解液从电解液罐1中流到锂离子电池7中。锂离子电池7的左注液孔7-1和右注液孔7-2上的两个流量计分别表示电解液流量，通过差值可计算出电池的注液量，当锂离子电池7达到注液量时，先关闭进液阀3，真空泵14继续工作一段时间以排出锂离子电池7内部的微气泡，保证锂离子电池7注液质量。锂离子电池7采用“并联”连接方式，使各电池在注液的同时互不干扰，保证电池注液质量的同时提高了注液效率。注液时，锂离子电池7内部的多余电解液和气体被收集在缓冲罐13中，其中，气体通过真空泵14排出，电解液被收集在缓冲罐15中，可通过缓冲罐中的液位管13-1观察电解液在缓冲罐内的位置，过多时可通过排液口13-2排出，使电解液得以继续利用。When filling the battery, ensure that the liquid inlet valve 3, left control valve 5, right control valve 9 and liquid outlet valve 11 are all open, so that the electrolyte tank 1, lithium-ion battery 7, buffer tank 13 and vacuum pump 14 are kept connected. Turn on the vacuum pump 14 to first extract the gas inside the lithium-ion battery 7 . At this time, due to the pressure difference, electrolyte will flow from the electrolyte tank 1 to the lithium-ion battery 7 . The two flowmeters on the left liquid injection hole 7-1 and the right liquid injection hole 7-2 of the lithium-ion battery 7 represent the electrolyte flow respectively, and the liquid injection volume of the battery can be calculated by the difference. When the lithium-ion battery 7 reaches When injecting the amount of liquid, first close the liquid inlet valve 3, and the vacuum pump 14 continues to work for a period of time to discharge the microbubbles inside the lithium-ion battery 7 to ensure the quality of the liquid injection of the lithium-ion battery 7. The lithium-ion battery 7 adopts a "parallel" connection mode, so that each battery does not interfere with each other when injecting liquid, and improves the efficiency of liquid injection while ensuring the quality of battery liquid injection. During liquid injection, excess electrolyte and gas inside the lithium-ion battery 7 are collected in the buffer tank 13, wherein the gas is discharged through the vacuum pump 14, and the electrolyte is collected in the buffer tank 15, which can pass through the liquid level pipe in the buffer tank 13-1 Observe the position of the electrolyte in the buffer tank. If it is too much, it can be discharged through the discharge port 13-2, so that the electrolyte can be continuously used.

以上所述仅为本发明专利的较佳实施例，并非用来限定本发明的实施范围；即凡依本发明的权利要求范围所做的各种等同变换，均为本发明的权利要求范围。The above descriptions are only preferred embodiments of the patent of the present invention, and are not intended to limit the implementation scope of the present invention; that is, all equivalent transformations made according to the scope of the claims of the present invention are within the scope of the claims of the present invention.

Claims (6)

1. the through electrolyte filling method of lithium ion battery, it is characterised in that: comprise the following steps:
(1) on the cover plate of lithium ion battery, offer two liquid injection holes；
(2) be connected with electrolyte tank respectively by two liquid injection holes on lithium ion battery, vacuum pump connection carries out evacuation and note Liquid；
(3) reservoir quantity meets when requiring, first closes electrolyte tank, and vacuum pump works on 10-60s, to discharge lithium ion battery Internal microbubble.
A kind of through electrolyte filling method of lithium ion battery the most according to claim 1, it is characterised in that: will by connecting tube Two liquid injection holes of several lithium ion batteries are together in parallel, and are connected with electrolyte tank, vacuum pump the most respectively, carry out simultaneously Evacuation and fluid injection.
A kind of through electrolyte filling method of lithium ion battery the most according to claim 1, it is characterised in that: at liquid injection hole and electricity Solve flow container, between liquid injection hole and vacuum pump, be respectively equipped with effusion meter, draw current reservoir quantity by difference on effusion meter.
4. realize a device for the through electrolyte filling method of a kind of lithium ion battery as claimed in claim 1, including lithium ion Battery (7) and electrolyte tank (1), it is characterised in that: offer left liquid injection hole (7-1) on the cover plate of described lithium ion battery (7) With right liquid injection hole (7-2), described left liquid injection hole (7-1) is connected with electrolyte tank (1) by feed tube (2), right liquid injection hole (7-2) It is connected with vacuum pump (14) by drain pipe (12)；Liquid feed valve (3), feed liquor effusion meter it is sequentially provided with on described feed tube (2) (6), drain pipe (12) is sequentially provided with out flow meters (8) and liquid valve (11).
Device the most according to claim 4, it is characterised in that: it is provided with slow between described liquid valve (11) and vacuum pump (14) Rushing tank (13), described surge tank (13) is provided with liquid level tube (13-1), and surge tank (13) bottom end outlet is provided with tapping valve (13-2).
Device the most according to claim 4, it is characterised in that: described feed tube (2) with by several lithium ion batteries (7) On left liquid injection hole (7-1) carry out parallel connection left connecting tube (4) connect, the left liquid injection hole (7-1) of each lithium ion battery (7) Arrival end is equipped with left control valve (5)；Described drain pipe (12) with by the right liquid injection hole (7-on several lithium ion batteries (7) 2) the right connecting tube (10) carrying out parallel connection connects, and the port of export of the right liquid injection hole (7-2) of each lithium ion battery (7) is equipped with the right side Control valve (9).
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