Isobaric injection system

Abstract

This application relates to the field of battery manufacturing equipment technology, and in particular to an isobaric liquid injection system. The isobaric liquid injection system includes an isobaric liquid injection device, which comprises a first housing with a first receiving cavity, a second housing with a second receiving cavity for placing battery cells, an injection mechanism, and a positive and negative pressure mechanism. The first housing and the second housing are sealably connected to form a sealed cavity. The injection mechanism is used to inject liquid into the battery cells. The injection mechanism includes a storage cavity, and both the storage cavity and the sealed cavity are connected to the positive and negative pressure mechanism. The positive and negative pressure mechanism can evacuate and de-evacuate the storage cavity and the battery cells multiple times to achieve isobaric liquid injection; simultaneously, it ensures that the pressure inside the sealed cavity is always the same as the pressure inside the battery cell during the liquid injection process, thereby preventing damage to the battery cells due to large internal and external pressure differences during the liquid injection process.

Description

Technical Field

[0001] This application relates to the field of battery production equipment technology, and in particular to an isobaric liquid injection system. Background Technology

[0002] In the production process of lithium-ion batteries, an isobaric electrolyte injection process is usually used to inject electrolyte into the battery to make the internal pressure of the battery equal to that of the injection system. This ensures that the electrolyte can enter the battery evenly and slowly, and avoids electrolyte splashing due to excessive pressure difference, which could damage the internal structure of the battery. However, this also inevitably results in a certain pressure difference between the inside of the battery and the external environment during the electrolyte injection process, making the battery susceptible to damage under the influence of the internal and external pressure difference. Utility Model Content

[0003] The purpose of this application is to provide an isobaric liquid injection device to achieve isobaric liquid injection into a battery and ensure that the internal and external pressures are equal during the liquid injection process.

[0004] This application provides an isobaric injection system, including an isobaric injection device, the isobaric injection device comprising: The first housing has a first receiving cavity; The second housing has a second receiving cavity for accommodating the battery cell to be injected with liquid. The second housing can be sealed to the first housing to connect the first receiving cavity and the second receiving cavity and form a sealed cavity. The liquid injection mechanism is disposed in the first receiving cavity. The liquid injection mechanism includes a liquid storage cavity and is used to inject liquid into the battery cell to be injected. A positive and negative pressure mechanism is disposed in the first receiving cavity and communicates with the first housing and the liquid storage cavity, and is used to provide positive or negative pressure to the sealing cavity and the liquid storage cavity.

[0005] Furthermore, the positive and negative pressure mechanism includes a main air pipe, a first branch pipe, a second branch pipe, a first valve, and a second valve; The first housing is connected to the main gas line via the first branch pipe, and the liquid storage chamber is connected to the main gas line via the second branch pipe; The isobaric injection system also includes a pressure control device for providing positive and negative pressure. One end of the gas main is equipped with the first valve and connected to the pressure control device. The other end of the gas main serves as a vent and is equipped with the second valve.

[0006] Furthermore, the isobaric injection system also includes a delivery device for providing electrolyte; The liquid injection mechanism also includes a liquid injection valve, and the liquid storage chamber is connected to the delivery device through the liquid injection valve.

[0007] Furthermore, the number of the injection mechanisms is multiple, and the multiple injection mechanisms are arranged side by side at intervals; The battery cells can be placed in the second housing at positions opposite to each of the liquid injection mechanisms, so that multiple battery cells can be injected with liquid one-to-one by the multiple liquid injection mechanisms.

[0008] Furthermore, the isobaric injection device also includes a positioning element; The positioning element is disposed in the second housing, and each of the positioning elements has a slot formed at the position opposite to each of the liquid injection mechanisms, so that the battery cell can be adapted and inserted.

[0009] Furthermore, the second box has a first direction, the first box is located on one side of the second box along the first direction, and the first box is slidably disposed along the first direction; The isobaric injection device further includes a first driving component, the driving end of which is connected to the first housing to drive the first housing to move along the first direction.

[0010] Furthermore, the second housing has a second direction perpendicular to the first direction, and the second housing is slidably disposed along the second direction; The isobaric injection device further includes a second driving component, the driving end of which is connected to the second housing to drive the second housing to move along the second direction.

[0011] Furthermore, a first magnetic attraction element is provided at the end of the first box facing the second box; The second box is provided with a second magnetic attraction member at one end facing the first box. The first magnetic attraction member and the second magnetic attraction member can attract each other to seal the first box and the second box.

[0012] Furthermore, the isobaric injection device also includes a first pressure gauge and a second pressure gauge; The first pressure gauge is connected to the first housing to monitor the pressure in the sealed cavity; The second pressure gauge is connected to the liquid storage chamber to monitor the pressure of the liquid storage chamber.

[0013] Furthermore, the isobaric injection system also includes a turntable and a rotary drive device; The number of the isobaric injection devices is multiple, and the multiple isobaric injection devices are arranged circumferentially at intervals on the turntable; The turntable is rotatably configured and connected to the drive end of the rotary drive device, so that it can rotate around the axis of the turntable under the drive of the rotary drive device.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: The isobaric electrolyte injection system provided in this application includes an isobaric electrolyte injection device, which includes a first housing, a second housing, an injection mechanism, and a positive and negative pressure mechanism. The first housing has a first receiving cavity, in which the injection mechanism and the positive and negative pressure mechanism are both located. The second housing has a second receiving cavity, in which a battery cell to be injected can be placed. The first housing and the second housing can be sealed together to connect the first and second receiving cavities and form a sealed cavity. The injection mechanism includes a storage cavity for containing electrolyte and is connected to the positive and negative pressure mechanism, which can provide both positive and negative pressure to the storage cavity. When the first housing and the second housing are sealed together, the injection mechanism can be connected to the injection port of the battery cell, allowing the storage cavity to communicate with the inside of the battery cell. Simultaneously, the positive and negative pressure mechanism can evacuate and de-evacuate the storage cavity and the battery cell multiple times, allowing the electrolyte in the storage cavity to flow into the battery cell in an isobaric injection manner. The positive and negative pressure mechanism is also connected to the first receiving cavity, so that when the first box and the second box are sealed together, the positive and negative pressure mechanism is connected to the sealed cavity. Thus, when the positive and negative pressure mechanism is used to regulate the pressure of the liquid storage cavity (i.e., vacuuming and devastating), the positive and negative pressure mechanism can also synchronously regulate the pressure of the sealed cavity, so that the pressure inside the sealed cavity is always the same as the pressure inside the battery cell, so as to avoid damage to the battery cell due to the large pressure difference between the inside and outside during the liquid injection process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the isobaric injection device provided in the embodiments of this application; Figure 2 This is a partial schematic diagram of the isobaric injection device provided in the embodiments of this application; Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0017] Figure label: 1- Turntable; 2-Isobaric liquid injection device, 21-First housing, 22-Second housing, 23-First driving component, 24-Second driving component, 25-Liquid storage chamber, 26-Main gas pipe, 27-First branch pipe, 28-Second branch pipe, 29-First pressure gauge, 210-Second pressure gauge, 211-Liquid injection valve; 3-Battery cell; a - First direction, b - Second direction. Detailed Implementation

[0018] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0019] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0020] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] The following reference Figures 1 to 3 This application describes an isobaric injection system according to some embodiments.

[0024] This application provides an isobaric injection system, such as Figure 1 and Figure 2 As shown, the isobaric liquid injection system includes an isobaric liquid injection device 2. The isobaric liquid injection device 2 includes a first housing 21, a second housing 22, a liquid injection mechanism, and a positive and negative pressure mechanism. The first housing 21 has a first receiving cavity, and the liquid injection mechanism and the positive and negative pressure mechanism are both located in the first receiving cavity. The second housing 22 has a second receiving cavity, and the battery cell 3 to be injected can be placed in the second receiving cavity. The first housing 21 and the second housing 22 can be sealed together to connect the first receiving cavity and the second receiving cavity and form a sealed cavity. The electrolyte injection mechanism includes a storage chamber 25 for storing electrolyte. The storage chamber 25 is connected to a positive and negative pressure mechanism, which can provide both positive and negative pressure to the storage chamber 25. When the first housing 21 and the second housing 22 are sealed together, the electrolyte injection mechanism can be connected to the electrolyte injection port of the battery cell 3, so that the storage chamber 25 is connected to the inside of the battery cell 3. At the same time, the positive and negative pressure mechanism can evacuate and de-evacuate the storage chamber 25 and the battery cell 3 and cycle them multiple times, so that the electrolyte in the storage chamber 25 can flow into the battery cell 3 in an isobaric injection manner.

[0025] The positive and negative pressure mechanism is also connected to the first receiving cavity, so that when the first housing 21 and the second housing 22 are sealed together, the positive and negative pressure mechanism is connected to the sealed cavity. Thus, when the positive and negative pressure mechanism is used to regulate the pressure of the liquid storage cavity 25 (i.e., vacuuming and devastating), the positive and negative pressure mechanism can also synchronously regulate the pressure of the sealed cavity, so that the pressure inside the sealed cavity is always the same as the pressure inside the battery cell 3, so as to avoid damage to the battery cell 3 due to the large pressure difference between the inside and outside during the liquid injection process.

[0026] In one embodiment of this application, preferably, as shown below, Figure 2 and Figure 3As shown, the positive and negative pressure mechanism includes a main air pipe 26, a first branch pipe 27, a second branch pipe 28, a first valve, and a second valve. One end of the first branch pipe 27 is connected to the first housing 21, and the other end of the first branch pipe 27 is connected to the main air pipe 26, so that the first housing 21 is connected to the main air pipe 26 through the first branch pipe 27. One end of the second branch pipe 28 is connected to the liquid storage chamber 25 of the injection mechanism, and the other end of the second branch pipe 28 is connected to the main air pipe 26, so that the liquid storage chamber 25 is connected to the main air pipe 26 through the second branch pipe 28. The isobaric injection system also includes a pressure control device, which can provide both positive and negative pressure. One end of the main air pipe 26 is connected to the pressure control device through the first valve, so that the pressure control device can be connected to both the liquid storage chamber 25 and the sealing chamber through the main air pipe 26, so as to simultaneously regulate the pressure of the liquid storage chamber 25 and the sealing chamber, making the pressure of the liquid storage chamber 25 and the sealing chamber equal. The other end of the gas main pipe 26 is used as a vent and is equipped with a second valve to close or open the vent. In actual operation, when the pressure control device is used to pressurize or evacuate the liquid storage chamber 25 and the sealing chamber, the first valve is opened and the second valve is closed. When it is necessary to release the pressure of the liquid storage chamber 25 and the sealing chamber, the first valve is closed and the second valve is opened.

[0027] In one embodiment of this application, preferably, as shown below, Figure 3 As shown, the isobaric injection system also includes a delivery device for supplying electrolyte to the injection mechanism; the injection mechanism also includes an injection valve 211, one end of which is connected to the storage chamber 25, and the other end of which is connected to the delivery device. Thus, when the injection valve 211 is opened, the delivery device can be connected to the storage chamber 25 to deliver electrolyte into the storage chamber 25.

[0028] In one embodiment of this application, preferably, there are multiple liquid injection mechanisms arranged side by side and spaced apart on the first housing 21; multiple battery cells 3 can be placed in the second housing 22, and the multiple battery cells 3 are arranged side by side and spaced apart. When the first housing 21 and the second housing 22 are sealed together, the multiple liquid injection mechanisms are arranged opposite to the multiple battery cells 3 in a one-to-one correspondence, so that multiple battery cells 3 can be injected with liquid simultaneously through the multiple liquid injection mechanisms in a one-to-one correspondence.

[0029] In one embodiment of this application, preferably, the isobaric liquid injection device 2 further includes a positioning member disposed in the second housing 22. The positioning member has a slot, and the battery cell 3 can be inserted into the slot to fix the battery cell 3 in the second housing 22. At the same time, when the first housing 21 and the second housing 22 are sealed together, the liquid injection mechanism on the first housing 21 can be directly opposite and connected to the liquid injection port of the battery cell 3.

[0030] Preferably, there are multiple slots arranged side by side, and each slot can accommodate a battery cell 3, thereby fixing multiple battery cells 3 in the second housing 22 by means of positioning elements.

[0031] In one embodiment of this application, preferably, as shown below, Figure 2 As shown, the second housing 22 has a first direction a, and an opening is formed on one side of the second housing 22 along the first direction a to facilitate loading and unloading of battery cells 3; the first housing 21 is disposed on one side of the second housing 22 along the first direction a, and an opening is also formed on one side of the first housing 21 along the first direction a, and the opening of the first housing 21 is opposite to the opening of the second housing 22. The first housing 21 is slidably disposed along the first direction a. The isobaric liquid injection device 2 also includes a first driving member 23. The driving end of the first driving member 23 is connected to the first housing 21 to drive the first housing 21 to move along the first direction a. The first housing 21 can move toward the second housing 22 under the drive of the first driving member 23 until it abuts against the second housing 22, so that the first housing 21 and the second housing 22 are sealed together and form a sealed cavity for subsequent liquid injection of the battery cell 3. The first housing 21 can also be lifted away from the second housing 22 under the drive of the first driving member 23 so that the liquid-injected battery cell 3 can be taken out from the second housing 22 and reinstalled with the battery cell 3 that needs liquid injection.

[0032] In one embodiment of this application, preferably, as shown below, Figure 2 As shown, the second housing 22 has a second direction b, which is perpendicular to the first direction a, and the second housing 22 is slidably disposed along the second direction b. The isobaric liquid injection device 2 also includes a second driving member 24, the driving end of which is connected to the second housing 22 to drive the second housing 22 to move along the second direction b. The second housing 22 can be moved to a position directly opposite the first housing 21 under the drive of the second driving member 24, so that the first housing 21 can move towards the second housing 22 along the first direction a to form a sealed connection with the second housing 22. When the first housing 21 is lifted away from the second housing 22, the second housing 22 can be moved out from the position directly opposite the first housing 21 under the drive of the second driving member 24, so as to facilitate cleaning of the second housing 22 and loading and unloading of the battery cells 3.

[0033] In one embodiment of this application, preferably, the first box 21 is provided with a first magnetic attractor at one open end, and the second box 22 is provided with a second magnetic attractor at one open end. When the first box 21 moves to seal against the second box 22, the first magnetic attractor can attract the second magnetic attractor so that the first box 21 and the second box 22 are stably connected together and form a sealed cavity.

[0034] Preferably, the first magnetic attractor is an annular ring surrounding the first housing 21, and the second magnetic attractor is an annular ring surrounding the second housing 22, thereby enabling the first housing 21 and the second housing 22 to be stably attracted together. Alternatively, there may be multiple first magnetic attractors, which are spaced apart around the first housing 21; there may also be multiple second magnetic attractors, which are spaced apart around the second housing 22, and the multiple second magnetic attractors can be attracted to each other in a one-to-one correspondence with the multiple first magnetic attractors, so that the first housing 21 and the second housing 22 are stably attracted together.

[0035] It should be noted that the opposite end faces of the first housing 21 and the second housing 22 are smooth and flat surfaces. When the first housing 21 and the second housing 22 are pressed together under a predetermined pressure, a certain degree of sealing at the connection point can be guaranteed. Alternatively, a sealing gasket can be laid on the open end face of the second housing 22 to further provide sealing performance and pressure resistance.

[0036] In one embodiment of this application, preferably, the isobaric injection device 2 further includes a first pressure gauge 29 and a second pressure gauge 210. The first pressure gauge 29 is connected to the first housing 21 to monitor the pressure of the sealed cavity, and the second pressure gauge 210 is connected to the liquid storage cavity 25 to monitor the pressure of the liquid storage cavity 25, thereby enabling monitoring of whether the pressure of the sealed cavity and the liquid storage cavity 25 is equal during the injection process.

[0037] In one embodiment of this application, preferably, the isobaric liquid injection system further includes a turntable 1, a rotary drive device, and an injection station. Multiple isobaric liquid injection devices 2 are arranged circumferentially on the turntable 1. The turntable 1 is rotatably mounted and connected to the drive end of the rotary drive device, allowing the turntable 1 to rotate around its own axis under the drive of the rotary drive device, and to sequentially rotate the multiple isobaric liquid injection devices 2 to the injection station. At the injection station, the operator can load and unload battery cells 3 from the second housing 22, connect the main gas pipe 26 on the first housing 21 to the pressure control device, connect the injection valve 211 on the storage chamber 25 to the electrolyte supply delivery device, and then seal the first housing 21 and the second housing 22 together to inject the battery cells 3.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An isobaric injection system, characterized in that, Includes an isobaric injection device (2), said isobaric injection device (2) comprising: The first housing (21) has a first receiving cavity; The second housing (22) has a second receiving cavity for receiving the battery cell (3) to be injected with liquid. The second housing (22) can be sealed to the first housing (21) to connect the first receiving cavity and the second receiving cavity and form a sealed cavity. The liquid injection mechanism is located in the first receiving cavity. The liquid injection mechanism includes a liquid storage cavity (25) and is used to inject liquid into the battery cell (3) to be injected. A positive and negative pressure mechanism is provided in the first receiving cavity and communicates with the first housing (21) and the liquid storage cavity, and is used to provide positive or negative pressure to the sealing cavity and the liquid storage cavity (25).

2. The isobaric injection system according to claim 1, characterized in that, The positive and negative pressure mechanism includes a main air pipe (26), a first branch pipe (27), a second branch pipe (28), a first valve, and a second valve; The first housing (21) is connected to the main gas pipe (26) through the first branch pipe (27), and the liquid storage chamber (25) is connected to the main gas pipe (26) through the second branch pipe (28); The isobaric injection system also includes a pressure control device for providing positive and negative pressure. One end of the gas main pipe (26) is equipped with the first valve and connected to the pressure control device. The other end of the gas main pipe (26) is used as a vent and is equipped with the second valve.

3. The isobaric injection system according to claim 1, characterized in that, The isobaric injection system also includes a delivery device for providing electrolyte; The liquid injection mechanism also includes a liquid injection valve (211), and the liquid storage chamber (25) is connected to the delivery device through the liquid injection valve (211).

4. The isobaric injection system according to claim 1, characterized in that, The number of the injection mechanism is multiple, and the multiple injection mechanisms are arranged side by side at intervals; The battery cell (3) can be placed in the second housing (22) at the position opposite to each of the liquid injection mechanisms, so that the multiple battery cells (3) can be injected with liquid one by one through the multiple liquid injection mechanisms.

5. The isobaric injection system according to claim 4, characterized in that, The isobaric injection device (2) also includes a positioning element; The positioning element is disposed inside the second housing (22), and the positioning element has a slot formed at the position opposite to each of the liquid injection mechanisms, so that the battery cell (3) can be inserted into it.

6. The isobaric injection system according to claim 1, characterized in that, The second housing (22) has a first direction (a), and the first housing (21) is located on one side of the second housing (22) along the first direction (a), and the first housing (21) is slidably disposed along the first direction (a); The isobaric injection device (2) further includes a first driving member (23), the driving end of which is connected to the first housing (21) to drive the first housing (21) to move along the first direction (a).

7. The isobaric injection system according to claim 6, characterized in that, The second housing (22) has a second direction (b) perpendicular to the first direction (a), and the second housing (22) is slidably disposed along the second direction (b); The isobaric injection device (2) further includes a second driving member (24), the driving end of which is connected to the second housing (22) to drive the second housing (22) to move along the second direction (b).

8. The isobaric injection system according to claim 1, characterized in that, The first box (21) is provided with a first magnetic attraction element at one end facing the second box (22); The second box (22) is provided with a second magnetic suction member at one end facing the first box (21). The first magnetic suction member and the second magnetic suction member can attract each other to seal the first box (21) and the second box (22).

9. The isobaric injection system according to claim 1, characterized in that, The isobaric injection device (2) also includes a first pressure gauge (29) and a second pressure gauge (210); The first pressure gauge (29) is connected to the first housing (21) to monitor the pressure of the sealed cavity; The second pressure gauge (210) is connected to the liquid storage chamber (25) to monitor the pressure of the liquid storage chamber (25).

10. The isobaric injection system according to claim 1, characterized in that, The isobaric injection system also includes a turntable (1) and a rotary drive device; The number of the isobaric injection devices (2) is multiple, and the multiple isobaric injection devices (2) are arranged circumferentially at intervals on the turntable (1); The turntable (1) is rotatably configured and connected to the drive end of the rotary drive device so that it can rotate around the axis of the turntable (1) under the drive of the rotary drive device.

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