Battery liquid injection device

Abstract

The utility model relates to and discloses a battery liquid injection device. Relates to the technical field of battery manufacturing. The liquid injection device specifically comprises a liquid injection cylinder internally provided with a liquid injection cavity and a liquid injection needle rotationally connected with the liquid injection cylinder, and the liquid injection needle communicates with the liquid injection cavity; a liquid injection hole is formed in the liquid injection needle, the liquid injection hole deviates from the axis of the liquid injection needle, the liquid injection needle is inserted into the liquid injection opening of the battery shell, the liquid injection needle is driven to rotate around the axis of the liquid injection needle, and the liquid injection hole is used for injecting electrolyte into the battery shell in a rotating state. According to the utility model, the liquid injection hole is formed in the position where the liquid injection needle deviates from the axis, and the liquid injection needle is driven to rotate on the liquid injection cylinder around the axis of the liquid injection needle to drive the liquid injection hole to rotate around the axis of the liquid injection needle, so that the contact area between an electrolyte and a battery cell is increased, and the infiltration effect of the electrolyte on the battery cell is enhanced; the liquid injection efficiency is improved and the performance of the battery is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, and particularly relates to a battery liquid injection device. Background Art

[0002] Currently, the most commonly used batteries are chemical batteries, which mainly include a housing, an electric core encapsulated in the housing, and an electrolyte injected into the housing. The electrolyte is a colorless and transparent organic solvent, which serves as a carrier for ion transport in the battery and plays a crucial role in the performance of the battery. During the production process of the battery, first, the electric core is sealed in the battery housing, and a liquid injection port is reserved on the battery housing. Then, the electrolyte is injected into the battery housing through the liquid injection port by a liquid injection device to soak the electric core, and finally, the liquid injection hole is sealed.

[0003] In order to ensure the sealing performance of the battery housing, the reserved liquid injection port on the battery housing is usually small. Therefore, in the existing liquid injection devices, the electrolyte is usually injected into the battery housing by using a liquid injection needle. However, when using this method to inject liquid into the battery housing, there are generally problems of low liquid injection efficiency and poor soaking effect of the electrolyte on the electric core, which not only affects the production efficiency but also affects the performance of the battery. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery liquid injection device aiming at the deficiencies of the above-mentioned existing technologies, which can improve the liquid injection efficiency, enhance the soaking effect of the electrolyte on the electric core, thereby improving the production efficiency and ensuring the performance of the battery.

[0005] The utility model provides a battery liquid injection device, which includes a liquid injection cylinder with a liquid injection cavity arranged therein, and a liquid injection needle rotatably connected to the liquid injection cylinder. The liquid injection needle is communicated with the liquid injection cavity. A liquid injection hole is arranged on the liquid injection needle, and the liquid injection hole deviates from the axis of the liquid injection needle. The liquid injection needle is inserted into the liquid injection port of the battery housing, and the liquid injection needle is driven to rotate around its own axis direction. The liquid injection hole is used for injecting the electrolyte into the battery housing in a rotating state.

[0006] Furthermore, the liquid injection device further includes a liquid storage tank for storing the electrolyte, and a liquid injection pipeline for communicating the liquid storage tank with the liquid injection cavity. The liquid injection pipeline is used for transporting the electrolyte in the liquid storage tank to the liquid injection cavity.

[0007] Furthermore, the liquid injection needle includes an integrally formed needle body and a needle rod. The liquid injection hole is arranged on the bottom surface or the side surface of the needle body. The needle rod is rotatably connected to the liquid injection cylinder, and the needle body is used for being inserted into the liquid injection port of the battery housing.

[0008] Further, a vacuum joint is provided on the needle rod, the liquid injection device further includes a vacuum pumping mechanism connected to the vacuum joint, a vacuum hole is further provided on the needle body, the vacuum pumping mechanism acts on the vacuum hole, and the vacuum hole is used for evacuating the battery housing.

[0009] Further, the vacuum pumping mechanism includes a negative pressure fan for providing negative pressure, and a vacuum pipeline connecting the negative pressure fan and the vacuum joint.

[0010] Further, a vacuum chamber and a liquid infusion chamber are provided in the liquid injection needle, the vacuum chamber and the liquid infusion chamber extend from the needle rod to the needle body, one end of the vacuum chamber is communicated with the vacuum joint, the other end is communicated with the vacuum hole, one end of the liquid infusion chamber is communicated with the liquid injection chamber, and the other end is communicated with the liquid injection hole.

[0011] Further, a partition rib is further provided in the liquid injection needle, the partition rib extends from the needle rod to the needle body to separate the vacuum chamber from the liquid infusion chamber.

[0012] Further, an installation hole is provided at the bottom of the liquid injection cylinder, a bearing member is provided in the installation hole, an outer ring of the bearing member is fixedly connected to an inner wall of the installation hole, and an inner ring of the bearing member is sleeved on an outer wall of the needle rod.

[0013] Further, a limiting groove is provided on an inner ring of the bearing member, a limiting protrusion is provided on an outer wall of the needle rod, and the limiting protrusion is inserted and matched with the limiting groove.

[0014] Further, the liquid injection device further includes a rotation driving mechanism fixedly installed at the bottom of the liquid injection cylinder, and the rotation driving mechanism is used to drive the liquid injection needle to rotate around its own axis direction.

[0015] The battery liquid injection device proposed by the present utility model has the following beneficial effects:

[0016] (1) The liquid injection device breaks through the traditional battery liquid injection device, breaks through the thinking inertia and technical prejudice of vertically injecting electrolyte into the battery housing by a vertical needle, and particularly sets the liquid injection hole at a position deviating from the axis of the liquid injection needle. The rotation driving mechanism drives the liquid injection needle to rotate around its own axis on the liquid injection cylinder, driving the liquid injection hole to rotate around the axis direction of the liquid injection needle, thereby increasing the contact area between the electrolyte and the battery cell, further enhancing the infiltration effect of the electrolyte on the battery cell, improving the liquid injection efficiency, and ensuring the performance of the battery;

[0017] (2) The injection device further includes a vacuum pumping mechanism connected to the injection needle. A vacuum hole is also provided on the injection needle. The vacuum pumping mechanism evacuates the inside of the battery housing through the vacuum hole, thereby creating a negative pressure inside the battery housing, accelerating the flow rate of the electrolyte in the injection chamber and the injection needle, and thus accelerating the injection efficiency and improving the production efficiency.

[0018] (3) A vacuum chamber and an infusion chamber are provided inside the injection needle of the injection device. One end of the vacuum chamber is connected to a vacuum connector, and the other end is connected to the vacuum hole, enabling the negative pressure fan to evacuate the inside of the battery housing through the vacuum pipeline, the vacuum chamber, and the vacuum hole. One end of the infusion chamber is connected to the injection chamber, and the other end is connected to the injection hole, enabling the electrolyte in the injection chamber to flow into the infusion chamber and, after flowing through the infusion chamber, be output from the injection hole to achieve the injection of the battery.

[0019] (4) A partition rib is also provided inside the injection needle of the injection device. The partition rib is provided between the vacuum chamber and the infusion chamber, thereby separating the vacuum chamber and the infusion chamber through the partition rib to prevent the negative pressure fan from sucking the electrolyte in the infusion chamber into the vacuum chamber when evacuating the inside of the battery housing through the vacuum chamber and the vacuum hole, which not only affects the output of the electrolyte at the injection hole but also affects the efficiency of the negative pressure fan in evacuating the battery housing, and thus affects the injection efficiency of the battery.

[0020] (5) An installation hole is provided at the bottom of the injection cylinder of the injection device. A bearing member is provided inside the installation hole. The outer ring of the bearing member is fixedly connected to the inner wall of the installation hole, and the inner ring of the bearing member is sleeved on the outer wall of the needle rod, thereby realizing the rotational connection between the needle rod and the injection cylinder through the bearing member to prevent friction between the outer wall of the needle rod and the inner wall of the installation hole and affect the service life of the injection cylinder and the injection needle.

[0021] (6) A limit groove is provided on the inner ring of the bearing member of the injection device, and a limit protrusion is provided on the outer wall of the needle rod. The limit protrusion is inserted and matched with the limit groove, thereby enabling the inner ring of the bearing member to rotate synchronously with the needle rod around its own axis direction through the limit of the limit protrusion and the limit groove, while the outer ring of the bearing member remains fixed to the inner wall of the installation hole, and thus realizing the rotational connection between the needle rod and the injection cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0023] Figure 1 is a schematic structural diagram of a battery injection device according to an embodiment of the present invention;

[0024] Figure 2 is an exploded view of the connection between the injection needle and the injection cylinder of a battery injection device according to an embodiment of the present invention;

[0025] Figure 3 Cross-sectional schematic diagram of the connection between the liquid injection needle and the liquid injection cylinder of a battery liquid injection device according to an embodiment of the present invention;

[0026] Figure 4 Cross-sectional schematic diagram of the liquid injection needle of a battery liquid injection device according to an embodiment of the present invention.

[0027] In the figure: 1. Liquid injection cylinder; 11. Liquid injection cavity; 12. Mounting hole; 13. Bearing member; 131. Limit groove; 2. Liquid injection needle; 21. Needle body; 211. Liquid injection hole; 212. Vacuum hole; 22. Needle rod; 221. Vacuum joint; 222. Limit projection; 23. Vacuum cavity; 24. Liquid infusion cavity; 25. Partition rib; 3. Rotation drive mechanism; 4. Liquid storage tank; 5. Liquid injection pipeline; 6. Negative pressure fan; 7. Vacuum pipeline. Specific implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 to 4 , a battery liquid injection device according to an embodiment of the present invention includes a liquid injection cylinder 1 provided with a liquid injection cavity 11 therein, and a liquid injection needle 2 rotatably connected to the liquid injection cylinder 1, and the liquid injection needle 2 communicates with the liquid injection cavity 11; a liquid injection hole 211 is provided on the liquid injection needle 2, the liquid injection hole 211 deviates from the axis of the liquid injection needle 2, the liquid injection needle 2 is inserted into the liquid injection port of the battery housing, and the liquid injection needle 2 is driven to rotate around its own axis, and the liquid injection hole 211 is used to inject electrolyte into the battery housing in a rotating state.

[0030] In this patent, the liquid injection device includes a liquid injection cylinder 1 and a liquid injection needle 2, the liquid injection needle 2 is rotatably connected to the liquid injection cylinder 1, a liquid injection cavity 11 is provided in the liquid injection cylinder 1, and the liquid injection needle 2 communicates with the liquid injection cavity 11. When injecting liquid into the battery, electrolyte is loaded in the liquid injection cavity 11, and the liquid injection needle 2 communicates with the liquid injection cavity 11, so that the electrolyte in the liquid injection cavity 11 can flow into the liquid injection needle 2.

[0031] A liquid injection hole 211 is provided on the liquid injection needle 2. When the liquid injection needle 2 is inserted into the liquid injection port of the battery housing, the liquid injection hole 211 is located inside the battery housing, so that the electrolyte flowing into the liquid injection needle 2 can be injected into the battery housing through the liquid injection hole 211 to infiltrate the battery core in the battery housing.

[0032] Since the size of the liquid injection port provided on the battery case is small compared to the size of the battery cell, for the liquid injection needle 2 inserted into the battery case through the liquid injection port, if its liquid injection hole 211 injects the electrolyte into the battery case only at a fixed position, limited by the fluidity of the electrolyte itself, the diffusion speed of the electrolyte is slow, resulting in a small contact area between the electrolyte and the battery cell, and further resulting in a poor wetting effect of the electrolyte on the battery cell. Moreover, the electrolyte accumulated at one position of the battery cell will affect the subsequent outflow of the electrolyte from the liquid injection hole 211, thus affecting the liquid injection efficiency.

[0033] Therefore, in the patent, it breaks through the thinking inertia and technical prejudice of the traditional battery liquid injection device that vertically injects the electrolyte into the battery case with a vertical needle. Specifically, the liquid injection hole 211 is set at a position deviating from the axis of the liquid injection needle 2. When injecting the electrolyte into the battery case through the liquid injection hole 211, the liquid injection needle 2 is driven to rotate around its own axis, driving the liquid injection hole 211 to rotate around the axis of the liquid injection needle 2, so that the liquid injection hole 211 injects the electrolyte into the battery case in a rotating state. At this time, the injected electrolyte is dispersed at multiple positions of the battery cell, thereby increasing the contact area between the electrolyte and the battery cell, and further enhancing the wetting effect of the electrolyte on the battery cell, ensuring the performance of the battery. At the same time, it avoids the accumulation of the electrolyte at one position of the battery cell, affecting the subsequent outflow of the electrolyte, thereby improving the liquid injection efficiency and further improving the production efficiency of the battery.

[0034] In this embodiment, the liquid injection device further includes a rotation driving mechanism 3, and the rotation driving mechanism 3 is fixedly installed at the bottom of the liquid injection cylinder 1. When injecting liquid into the battery, first insert the liquid injection needle 2 into the liquid injection port of the battery case so that the liquid injection hole 211 is located inside the battery case, and then drive the liquid injection needle 2 to rotate around its own axis through the rotation driving mechanism 3, driving the liquid injection hole 211 to rotate around the axis of the liquid injection needle 2, so that the liquid injection hole 211 injects the electrolyte into the battery case in a rotating state, thereby dispersing the electrolyte at multiple positions of the battery cell, increasing the contact area between the electrolyte and the battery cell, and further enhancing the wetting effect of the electrolyte on the battery cell, improving the liquid injection efficiency, and ensuring the performance of the battery.

[0035] Specifically, in actual implementation, the rotation driving mechanism 3 can be a rotary reducer fixedly installed at the bottom of the liquid injection cylinder 1. When the liquid injection needle 2 is rotatably connected to the bottom of the liquid injection cylinder 1, the rotary reducer is sleeved outside the liquid injection needle 2, so that when the rotary reducer is started, it can drive the liquid injection needle 2 to rotate around its own axis on the liquid injection cylinder 1.

[0036] In this embodiment, the liquid injection device further includes a liquid storage tank 4 for storing electrolyte, and a liquid injection pipeline 5 connecting the liquid storage tank 4 with the liquid injection chamber 11. The liquid injection pipeline 5 is used to transport the electrolyte in the liquid storage tank 4 to the liquid injection chamber 11. In this patent, the liquid injection device further includes the liquid storage tank 4 and the liquid injection pipeline 5. The liquid storage tank 4 stores electrolyte, and the liquid injection pipeline 5 connects the liquid storage tank 4 with the liquid injection chamber 11 of the liquid injection cylinder 1, so that the electrolyte in the liquid storage tank 4 enters the liquid injection chamber 11 through the liquid injection pipeline 5, realizing the supply of electrolyte during battery liquid injection.

[0037] It can be foreseen that a liquid extraction pump is provided on the liquid injection pipeline 5. When the liquid extraction pump is started, the electrolyte in the liquid storage tank 4 is extracted by the liquid extraction pump, and the electrolyte is driven to flow through the liquid injection pipeline 5 and then into the liquid injection chamber 11 of the liquid injection cylinder 1, thereby accelerating the supply of electrolyte and further accelerating the liquid injection efficiency.

[0038] In this embodiment, the liquid injection needle 2 includes an integrally formed needle body 21 and a needle rod 22. The liquid injection hole 211 is provided on the bottom surface or side surface of the needle body 21. The needle rod 22 is rotatably connected to the liquid injection cylinder 1, and the needle body 21 is used to be inserted into the liquid injection port of the battery housing. In this patent, the liquid injection needle 2 includes the needle body 21 and the needle rod 22, and the needle body 21 and the needle rod 22 are of an integral structure. When injecting liquid into the battery, the needle body 21 is used to be inserted into the liquid injection port of the battery housing, so that the liquid injection hole 211 on the needle body 21 is located inside the battery housing.

[0039] The needle rod 22 is rotatably connected to the bottom of the liquid injection cylinder 1. When the rotary reducer is fixedly installed at the bottom of the liquid injection cylinder 1, it is sleeved outside the needle rod 22, so as to drive the needle rod 22 to rotate around its own axis through the rotary reducer, driving the liquid injection hole 211 on the needle body 21 to rotate around the axis of the needle rod 22, and further injecting the electrolyte into the battery housing in a rotating state through the liquid injection hole 211.

[0040] In actual implementation, the needle body 21 and the needle rod 22 are coaxially arranged. Therefore, in this patent, the liquid injection hole 211 can be provided on the bottom surface of the needle body 21 and deviate from the axis of the needle body 21. When the rotary reducer drives the needle rod 22 to rotate around its own axis, the electrolyte flowing out of the liquid injection hole 211 is thrown out in the direction deviating from the axis of the needle body 21 under the action of the centrifugal force of rotation, so that the electrolyte injected into the battery housing is dispersed at multiple positions of the battery core.

[0041] In this patent, the liquid injection hole 211 can also be provided on the side surface of the needle body 21, and its orientation on the side surface of the needle body 21 has a radial component. Thus, when the rotary reducer drives the needle rod 22 to rotate around its own axis, the electrolyte flowing out of the liquid injection hole 211 is thrown out radially in the direction away from the needle body 21, so that the electrolyte injected into the battery housing is dispersed at multiple positions of the battery core.

[0042] In the patent, the liquid injection cylinder 1 and the liquid injection needle 2 are arranged in the vertical direction, so that the electrolyte in the liquid injection cavity 11 can flow into the liquid injection needle 2 under the action of its own gravity and flow out through the liquid injection holes 211 on the liquid injection needle 2. Further, in this embodiment, a vacuum joint 221 is provided on the needle rod 22, the liquid injection device further includes a vacuum pumping mechanism connected to the vacuum joint 221, and a vacuum hole 212 is also provided on the needle body 21. The vacuum pumping mechanism acts on the vacuum hole 212, and the vacuum hole 212 is used to evacuate the battery housing.

[0043] After the needle body 21 is inserted into the battery housing, the vacuum hole 212 is located inside the battery housing. Before injecting the electrolyte into the battery housing through the liquid injection needle 2, the vacuum pumping mechanism is first started, and the vacuum pumping mechanism evacuates the inside of the battery housing through the vacuum hole 212, thereby creating a negative pressure inside the battery housing.

[0044] Then, the electrolyte is injected. The negative pressure formed inside the battery housing can drive the electrolyte to quickly flow from the liquid injection cavity 11 to the liquid injection needle 2, and after quickly flowing through the liquid injection needle 2, it is output from the liquid injection hole 211, thereby accelerating the flow rate of the electrolyte in the liquid injection cavity 11 and the liquid injection needle 2, and further improving the liquid injection efficiency.

[0045] In actual implementation, when injecting the electrolyte into the battery housing through the liquid injection needle 2, the operation of the vacuum pumping mechanism can be stopped, or the vacuum pumping mechanism can be kept running at a low speed to continuously evacuate the inside of the battery housing, so as to slow down the increase in pressure inside the battery housing caused by the electrolyte entering the battery housing.

[0046] It can be foreseen that: in actual implementation, the injection speed of the electrolyte by the liquid injection needle 2 is higher than the diffusion speed of the electrolyte on the battery cell. Therefore, when the liquid injection hole 211 injects the electrolyte into the battery housing only at a fixed position, it is easy to cause the accumulation of the electrolyte, which affects the subsequent outflow of the electrolyte from the liquid injection hole 211, thereby affecting the liquid injection efficiency.

[0047] In this patent, the rotation driving mechanism 3 drives the liquid injection needle 2 to rotate around its own axis on the liquid injection cylinder 1, driving the liquid injection hole 211 to rotate around the axis of the liquid injection needle 2, so that the liquid injection hole 211 injects the electrolyte into the battery housing in a rotating state, thereby dispersing the electrolyte at multiple positions of the battery cell, avoiding the accumulation of the electrolyte at one position of the battery cell, and improving the liquid injection efficiency.

[0048] Specifically, in this embodiment, the vacuum pumping mechanism includes a negative pressure fan 6 for providing negative pressure, and a vacuum pipeline 7 connecting the negative pressure fan 6 and the vacuum joint 221. In this patent, the vacuum pumping mechanism includes a negative pressure fan 6 and a vacuum pipeline 7. The vacuum pipeline 7 connects the negative pressure fan 6 with the vacuum joint 221 on the needle rod 22. When the negative pressure fan 6 is started, the inside of the battery case is evacuated through the vacuum holes 212 located inside the battery case.

[0049] In this embodiment, an infusion cavity 24 is provided inside the liquid injection needle 2, and the infusion cavity 24 extends from the needle rod 22 to the needle body 21. When the liquid injection needle 2 is rotatably connected to the bottom of the liquid injection cylinder 1, the top of the infusion cavity 24 communicates with the liquid injection cavity 11 of the liquid injection cylinder 1, so that the electrolyte in the liquid injection cavity 11 can flow into the infusion cavity 24. The bottom of the infusion cavity 24 communicates with the liquid injection hole 211, so that after the electrolyte flows through the infusion cavity 24, it can be output from the liquid injection hole 211 to realize liquid injection into the battery.

[0050] A vacuum cavity 23 is also provided inside the liquid injection needle 2. The vacuum cavity 23 extends from the needle rod 22 to the needle body 21, so that the top of the vacuum cavity 23 communicates with the vacuum joint 221, and the bottom communicates with the vacuum hole 212. When the vacuum pipeline 7 connects the negative pressure fan 6 and the vacuum joint 221, the negative pressure fan 6 evacuates the inside of the battery case through the vacuum pipeline 7, the vacuum cavity 23 and the vacuum hole 212, and then a negative pressure is formed inside the battery case to accelerate the flow of the electrolyte in the liquid injection cylinder 1 and the liquid injection needle 2.

[0051] In this embodiment, a partition rib 25 is also provided inside the liquid injection needle 2. The partition rib 25 extends from the needle rod 22 to the needle body 21, and the partition rib 25 is arranged between the vacuum cavity 23 and the infusion cavity 24, so that the vacuum cavity 23 and the infusion cavity 24 are separated by the partition rib 25. When the negative pressure fan 6 evacuates the inside of the battery case through the vacuum cavity 23 and the vacuum hole 212, it prevents the electrolyte in the infusion cavity 24 from being pumped into the vacuum cavity 23, which not only affects the output of the electrolyte in the liquid injection hole 211, but also affects the efficiency of the negative pressure fan 6 in evacuating the battery case, and further affects the liquid injection efficiency of the battery.

[0052] In actual implementation, when the liquid injection hole 211 is provided on the side of the needle body 21, the liquid injection hole 211 can be a plurality of through holes provided on one side of the needle body 21, and the electrolyte in the infusion cavity 24 is output simultaneously through the plurality of through holes, thereby improving the liquid injection efficiency of the battery. The vacuum hole 212 can be a through hole provided on the other side of the needle body 21 and is arranged opposite to the liquid injection hole 211, so as to facilitate the arrangement of the partition rib 25 inside the liquid injection needle 2 and make the practicality of this liquid injection device stronger.

[0053] In this embodiment, an installation hole 12 is provided at the bottom of the liquid injection cylinder 1. A bearing member 13 is provided in the installation hole 12. The outer ring of the bearing member 13 is fixedly connected to the inner wall of the installation hole 12, and the inner ring of the bearing member 13 is sleeved on the outer wall of the needle rod 22. In this patent, the bearing member 13 includes an outer ring located on the outside, an inner ring located on the inside, and rolling elements located between the outer ring and the inner ring.

[0054] When the bearing member 13 is installed in the installation hole 12 at the bottom of the liquid injection cylinder 1, the outer ring is fixedly connected to the inner wall of the installation hole 12; by inserting the end of the needle rod 22 into the inner ring of the bearing member 13, the inner ring is sleeved on the outer wall of the needle rod 22, so that through the rolling elements between the inner ring and the outer ring, the relative rotation of the inner ring and the outer ring is realized, and further the rotational connection between the needle rod 22 and the liquid injection cylinder 1 is realized, preventing friction between the outer wall of the needle rod 22 and the inner wall of the installation hole 12 and affecting the service life of the liquid injection cylinder 1 and the liquid injection needle 2.

[0055] In this embodiment, a limiting groove 131 is provided on the inner ring of the bearing member 13, and a limiting protrusion 222 is provided on the outer wall of the needle rod 22. When the end of the needle rod 22 is inserted into the inner ring of the bearing member 13, the limiting protrusion 222 is inserted and matched with the limiting groove 131, so that through the limitation of the limiting protrusion 222 and the limiting groove 131, the inner ring of the bearing member 13 and the needle rod 22 rotate synchronously around their own axis directions, while the outer ring of the bearing member 13 remains fixed to the inner wall of the installation hole 12, and further the rotational connection between the needle rod 22 and the liquid injection cylinder 1 is realized.

[0056] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0057] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery liquid injection device, characterized in that: It includes a liquid injection cylinder (1) with a liquid injection cavity (11) provided therein, and a liquid injection needle (2) rotatably connected to the liquid injection cylinder (1), the liquid injection needle (2) being communicated with the liquid injection cavity (11); a liquid injection hole (211) is provided on the liquid injection needle (2), the liquid injection hole (211) deviates from the axis of the liquid injection needle (2), the liquid injection needle (2) is inserted into the liquid injection port of the battery housing, the liquid injection needle (2) is driven to rotate around its own axis direction, and the liquid injection hole (211) is used to inject electrolyte into the battery housing in a rotating state.

2. The battery liquid injection device according to claim 1, characterized in that: The liquid injection device further includes a liquid storage tank (4) for storing electrolyte, and a liquid injection pipeline (5) connecting the liquid storage tank (4) and the liquid injection cavity (11), the liquid injection pipeline (5) being used to transport the electrolyte in the liquid storage tank (4) to the liquid injection cavity (11).

3. The battery liquid injection device according to claim 1, characterized in that: The liquid injection needle (2) includes an integral needle body (21) and a needle rod (22), the liquid injection hole (211) is provided on the bottom surface or side surface of the needle body (21), the needle rod (22) is rotatably connected to the liquid injection cylinder (1), and the needle body (21) is used to be inserted into the liquid injection port of the battery housing.

4. A battery liquid injection device as described in claim 3, characterized in that: A vacuum joint (221) is provided on the needle rod (22), the liquid injection device further includes a vacuum pumping mechanism connected to the vacuum joint (221), a vacuum hole (212) is further provided on the needle body (21), the vacuum pumping mechanism acts on the vacuum hole (212), and the vacuum hole (212) is used to pump vacuum for the battery housing.

5. A battery liquid injection device as described in claim 4, characterized in that: The vacuum pumping mechanism includes a negative pressure blower (6) for providing negative pressure, and a vacuum pipeline (7) connecting the negative pressure blower (6) and the vacuum joint (221).

6. A battery liquid injection device as described in claim 4, characterized in that: A vacuum cavity (23) and an infusion cavity (24) are provided in the liquid injection needle (2), the vacuum cavity (23) and the infusion cavity (24) extend from the needle rod (22) to the needle body (21), one end of the vacuum cavity (23) is communicated with the vacuum joint (221), the other end is communicated with the vacuum hole (212), and one end of the infusion cavity (24) is communicated with the liquid injection cavity (11), and the other end is communicated with the liquid injection hole (211).

7. A battery liquid injection device as described in claim 6, characterized in that: A partition rib (25) is further provided in the liquid injection needle (2), the partition rib (25) extends from the needle rod (22) to the needle body (21) to separate the vacuum cavity (23) from the infusion cavity (24).

8. A battery liquid injection device as described in claim 3, characterized in that: An installation hole (12) is provided at the bottom of the liquid injection cylinder (1), a bearing member (13) is provided in the installation hole (12), the outer ring of the bearing member (13) is fixedly connected to the inner wall of the installation hole (12), and the inner ring of the bearing member (13) is sleeved on the outer wall of the needle rod (22).

9. A battery liquid injection device as described in claim 8, characterized in that: A limit groove (131) is provided on the inner ring of the bearing member (13), a limit protrusion (222) is provided on the outer wall of the needle rod (22), and the limit protrusion (222) is inserted and matched with the limit groove (131).

10. A battery liquid injection device as described in claim 1, characterized in that: The liquid injection device further includes a rotation driving mechanism (3) fixedly installed at the bottom of the liquid injection cylinder (1), and the rotation driving mechanism (3) is used to drive the liquid injection needle (2) to rotate around its own axis direction.

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