Battery liquid injection device and battery

Abstract

The utility model discloses a battery liquid injection device and a battery, and belongs to the technical field of batteries, the battery liquid injection device comprises a liquid injection shell, the liquid injection shell comprises a main body and a connecting part connected with the main body, the main body is provided with a liquid storage cavity and a liquid inlet communicated with the liquid storage cavity, and the connecting part is provided with a liquid conveying channel communicated with the liquid storage cavity; the connecting part is used for detachably connecting the battery and communicating the liquid storage cavity with a liquid injection hole of the battery; and the first sealing piece is detachably connected with the main body so as to seal the liquid inlet. The battery liquid injection process is simplified, the problem that the electrolyte absorbs water due to the fact that the electrolyte is exposed in air for a long time is solved, and the battery liquid injection quality is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery liquid injection device and a battery. Background Art

[0002] During the battery manufacturing process, after the battery cell is placed into the battery case, the remaining space in the case is small. When injecting electrolyte into the case, the absorption rate of the electrolyte by the battery cell is slow. Therefore, it is necessary to inject the electrolyte into the case in batches multiple times before battery formation.

[0003] Generally, it is necessary to first inject a part of the electrolyte, seal the liquid injection hole and then stand still at high temperature, then inject the liquid again. After injecting the liquid repeatedly for multiple times, formation is carried out, resulting in low production efficiency. At the same time, multiple liquid injections will expose the electrolyte to the air for a long time, which is prone to water absorption and affects the performance of the electrolyte. In addition, repeated liquid injections are also prone to cause some electrolyte to overflow, resulting in waste of raw materials. Summary of the Utility Model

[0004] Purpose of the Utility Model: The embodiments of this application provide a battery liquid injection device, aiming to solve the above technical problems; another purpose of this application is to provide a battery applying the above battery liquid injection device.

[0005] Technical Solution: The battery liquid injection device described in the embodiments of this application includes:

[0006] A liquid injection case, the liquid injection case includes a main body and a connecting part connecting the main body. The main body has a liquid storage cavity and a liquid inlet communicating with the liquid storage cavity. The connecting part has a liquid infusion channel communicating with the liquid storage cavity. The connecting part is used for detachably connecting to the battery and communicating the liquid storage cavity and the liquid injection hole of the battery;

[0007] A first seal, the first seal is detachably connected to the main body to seal the liquid inlet.

[0008] In some embodiments, the battery liquid injection device has a first direction, and the liquid inlet, the liquid storage cavity and the liquid infusion channel are sequentially distributed along the first direction.

[0009] In some embodiments, the flow-through area of the liquid storage cavity along the first direction decreases at least partially from near the liquid inlet to near the liquid infusion channel.

[0010] In some embodiments, the liquid storage cavity includes a liquid storage sub-cavity and a diversion cavity communicating with the liquid storage sub-cavity. The liquid inlet, the liquid storage sub-cavity, the diversion cavity and the liquid infusion channel are sequentially distributed along the first direction;

[0011] The flow-through area of the liquid storage sub-cavity along the first direction is greater than the flow-through area of the diversion cavity along the first direction.

[0012] In some embodiments, the cross-sectional area of the flow guiding cavity in the first direction decreases from near the liquid inlet to near the liquid infusion channel.

[0013] In some embodiments, the cross-sectional area of the liquid storage cavity in the first direction decreases from near the liquid inlet to near the liquid infusion channel.

[0014] In some embodiments, the battery liquid injection device further includes:

[0015] A second seal, which surrounds and connects the liquid injection shell, and is used to abut against the liquid injection shell and the battery to seal the liquid injection hole of the battery.

[0016] In some embodiments, at least a part of the connecting portion penetrates through the liquid injection hole of the battery, and the connecting portion is threadedly connected to the hole wall of the liquid injection hole.

[0017] In some embodiments, the liquid injection shell is made of a transparent material.

[0018] Correspondingly, a battery according to an embodiment of the present application includes a top cover, and the top cover is provided with a liquid injection hole. At least a part of the connecting portion of the above-mentioned battery liquid injection device can be embedded in the liquid injection hole, and the connecting portion is detachably connected to the top cover.

[0019] Beneficial effects: The battery liquid injection device of the embodiment of the present application includes a liquid injection shell and a first seal. The liquid injection shell includes a main body and a connecting portion connecting the main body. The main body has a liquid storage cavity and a liquid inlet communicating with the liquid storage cavity. The connecting portion has a liquid infusion channel communicating with the liquid storage cavity. The connecting portion is used to detachably connect to the battery and communicate the liquid storage cavity and the liquid injection hole of the battery. The first seal is detachably connected to the main body to seal the liquid inlet. When it is necessary to inject electrolyte into the battery, the battery is connected through the connecting portion to communicate the liquid storage cavity, the liquid infusion channel and the liquid injection hole. Inject the required amount of electrolyte for the battery into the liquid storage cavity from the liquid inlet, and then seal the liquid inlet through the first seal to complete the battery liquid injection operation. The liquid injection shell is beneficial to centrally store the required amount of electrolyte for battery liquid injection, avoiding repeated liquid injection, thereby simplifying the battery liquid injection process. At the same time, compared with multiple liquid injections, the liquid injection shell is used to centrally store the liquid once, and after the liquid injection shell stores the liquid, the liquid storage cavity is sealed by the first seal, which is beneficial to avoiding the problem of electrolyte water absorption caused by the electrolyte being exposed to the air for a long time, and improving the quality of battery liquid injection. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of the battery top cover and the battery liquid injection device in Embodiment 1 of the present application;

[0022] Figure 2 is an exploded structural diagram of the battery liquid injection device in Embodiment 1 of the present application;

[0023] Figure 3 is a schematic structural diagram of the liquid injection hole in the front view of Embodiment 1 of the present application;

[0024] Figure 4 is Figure 3 a partial cross-sectional view along line A-A in

[0025] Figure 5 is an exploded structural diagram of the battery liquid injection device in Embodiment 2 of the present application;

[0026] Figure 6 is a schematic structural diagram of the liquid injection hole in the front view of Embodiment 2 of the present application;

[0027] Figure 7 is Figure 6 a partial cross-sectional view along line B-B in

[0028] Reference numerals: 1, liquid injection shell; 10, main body; 100, liquid storage cavity; 1000, liquid storage sub-cavity; 1001, diversion cavity; 101, liquid inlet; 11, connection part; 110, liquid infusion channel; 2, first sealing member; 3, second sealing member; 4, top cover; 40, liquid injection hole; 41, annular groove; X, first direction. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present application. 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 one or more features. In the description of the present application, the meaning of "a plurality" is two or more, and at least one means it can be one, two, or more, unless otherwise specifically defined.

[0031] Using an electrode assembly with a high compaction density of the material and relatively small pores in the electrode is one way to improve the energy density of the battery. After the above-mentioned electrode assembly is placed in the battery housing, there is usually a problem that the margin of the electrode assembly group is large and the remaining space in the housing is small, which in turn leads to the problem that when the battery is filled with electrolyte, the electrode assembly absorbs the electrolyte at a relatively slow speed.

[0032] To ensure that the electrode assembly fully absorbs the electrolyte, before the battery formation, the method of injecting electrolyte into the housing multiple times is usually adopted to adapt to the speed at which the electrode assembly absorbs the electrolyte. Specifically, a part of the electrolyte is first injected into the housing, the injection hole is sealed, and the housing is left standing at a high temperature, and then the electrolyte is injected again. After injecting multiple times repeatedly, the formation is carried out. This not only results in low production efficiency of the battery, but also makes the electrolyte exposed to the air for a long time during multiple injections, and the electrolyte is prone to water absorption and affects the performance of the electrolyte.

[0033] In addition, repeated injection of the electrolyte multiple times is also likely to cause some electrolyte to overflow, resulting in waste of raw materials.

[0034] In view of this, in combination with Figures 1 to 7 , the embodiment of the present application provides a battery electrolyte injection device, aiming to overcome at least one of the above technical problems.

[0035] Embodiment 1:

[0036] Referring to Figures 1 to 4 , a battery electrolyte injection device includes an injection housing 1 and a first sealing member 2.

[0037] Among them, the liquid injection shell 1 includes a main body 10 and a connecting portion 11 connecting the main body 10. The main body 10 has a liquid storage cavity 100 and a liquid inlet 101 communicating with the liquid storage cavity 100. The connecting portion 11 has an infusion channel 110 communicating with the liquid storage cavity 100. The connecting portion 11 is used for detachably connecting to the battery and communicating the liquid storage cavity 100 and the liquid injection hole 40 of the battery. The first seal 2 is detachably connected to the main body 10 to seal the liquid inlet 101.

[0038] Before the battery formation, the overall liquid injection shell 1 is pre-connected to the battery through the connecting portion 11 to communicate the liquid storage cavity 100, the infusion channel 110 and the liquid injection hole 40. The electrolyte with the required injection volume for the battery is injected into the liquid storage cavity 100 through the liquid inlet 101. Subsequently, the liquid inlet 101 is sealed by the first seal 2 to complete the battery liquid injection operation. After that, the battery and the liquid injection shell 1 can be placed in a high-temperature furnace and left still to allow the battery core to fully absorb the electrolyte.

[0039] It can be understood that the volume of the liquid storage cavity 100 can be flexibly adjusted according to different battery specifications to be adapted, and it is satisfied that the preset volume of the liquid storage cavity 100 is greater than the required injection volume of the battery. The liquid injection shell 1 is beneficial to centrally store the electrolyte with the required injection volume for the battery, avoiding repeated liquid injection, thereby simplifying the battery liquid injection process and improving the battery production efficiency.

[0040] At the same time, compared with multiple liquid injections, the liquid injection shell 1 is used to centrally store the liquid once, and after the liquid injection shell 1 stores the liquid, the liquid storage cavity 100 is sealed by the first seal 2, which is beneficial to avoiding the problem that the electrolyte absorbs water due to being exposed to the air for a long time, and improving the battery liquid injection quality.

[0041] In some embodiments, referring to Figure 4 , the battery liquid injection device has a first direction X, and the liquid inlet 101, the liquid storage cavity 100 and the infusion channel 110 are sequentially distributed along the first direction X.

[0042] It should be noted that referring to Figure 1 and Figure 4 , taking the top cover 4 of the battery as a reference, the top cover 4 is provided with a liquid injection hole 40. The liquid injection shell 1 and the top cover 4 are sequentially arranged along the first direction X, and the liquid injection shell 1 is connected to the top cover 4 through the connecting portion 11 to realize the communication of the liquid storage cavity 100, the infusion channel 110 and the liquid injection hole 40.

[0043] In this embodiment, the first direction X is substantially parallel to the thickness direction of the top cover 4. Correspondingly, in the state of battery liquid injection, taking the battery placed on a horizontal plane as an example, the first direction X is also substantially parallel to the direction of gravity of the electrolyte stored in the liquid storage cavity 100. Therefore, in the state where the liquid storage cavity 100, the infusion channel 110 and the liquid injection hole 40 are communicated, the electrolyte in the liquid storage cavity 100 can flow to the liquid injection hole 40 and the inside of the battery case under the action of gravity.

[0044] In addition, it should be noted that the first seal 2 can be made of rubber material, and the liquid inlet 101 is sealed by inserting it into the liquid inlet 101 and achieving an interference fit with the liquid inlet 101.

[0045] In some embodiments, referring to Figure 3 and Figure 4 , the flow-through area of the liquid storage chamber 100 in the first direction X decreases at least partially from near the liquid inlet 101 to near the liquid infusion channel 110.

[0046] Specifically, in some embodiments, referring to Figure 3 and Figure 4 , the liquid storage chamber 100 includes a liquid storage sub-chamber 1000 and a diversion chamber 1001 communicating with the liquid storage sub-chamber 1000. The liquid inlet 101, the liquid storage sub-chamber 1000, the diversion chamber 1001, and the liquid infusion channel 110 are distributed in sequence along the first direction X.

[0047] The flow-through area of the liquid storage sub-chamber 1000 in the first direction X is larger than the flow-through area of the diversion chamber 1001 in the first direction X, and the flow-through area of the diversion chamber 1001 in the first direction X decreases from near the liquid storage sub-chamber 1000 to near the liquid infusion channel 110.

[0048] It can be understood that by adjusting the height of the liquid storage sub-chamber 1000 and the height of the diversion chamber 1001 in the first direction X, the actual capacity of the electrolyte accommodated in the liquid storage chamber 100 can be adjusted. At the same time, the converging diversion structure of the diversion chamber 1001 itself towards the liquid injection hole 40 is retained, which is beneficial to the rapid injection of the electrolyte into the liquid injection hole 40.

[0049] In other embodiments, it can also be that the flow-through area of the entire liquid storage chamber 100 in the first direction X decreases from near the liquid inlet 101 to near the liquid infusion channel 110. Correspondingly, adapted to the structure of the liquid storage chamber 100, the main body 10 also has a converging structure towards the connecting portion 11.

[0050] In some embodiments, referring to Figure 4 , at least a part of the connecting portion 11 penetrates through the liquid injection hole 40, and the connecting portion 11 is threadedly connected to the hole wall of the liquid injection hole 40. That is, the connecting portion 11 can be threadedly connected to the hole wall of the liquid injection hole 40, thereby realizing the rapid disassembly and assembly of the liquid injection shell 1 and the top cover 4. At the same time, the threaded connection between the connecting portion 11 and the hole wall of the liquid injection hole 40 ensures the sealing effect of the liquid infusion channel 110 communicating with the liquid injection hole 40.

[0051] In some embodiments, referring to Figure 4 , the battery liquid injection device further includes a second seal 3. The second seal 3 surrounds the connecting portion 11 and is connected to the connecting portion 11. The second seal 3 is used to abut against the liquid injection shell 1 and the battery to seal the liquid injection hole 40 of the battery.

[0052] Specifically, the second seal 3 can be made of rubber material. Refer to Figure 4 , a ring groove 41 is provided on the top cover 4 around the liquid injection hole 40, and the ring groove 41 communicates with the liquid injection hole 40. After the connecting portion 11 is threadedly connected to the liquid injection hole 40, the second seal 3 is embedded in the ring groove 41 and abuts against the top cover 4 and the connecting portion 11, thereby being beneficial to further improving the sealing effect at the liquid injection hole 40.

[0053] In some embodiments, the liquid injection housing 1 is made of a transparent material. The liquid injection housing 1 can be made of materials such as transparent quartz material or plastic material. The transparent liquid injection housing 1 facilitates observing the situation of the electrolyte being injected into the battery housing in the liquid storage cavity 100, and avoids disassembling the liquid injection housing 1 when the electrolyte in the liquid storage cavity 100 has not been completely discharged, resulting in leakage and waste of the electrolyte.

[0054] At the same time, scale lines can be provided on the liquid injection housing 1 along the first direction X, so as to facilitate confirming the amount of electrolyte injected into the liquid storage cavity 100 and the amount of electrolyte injected from the liquid storage cavity 100 into the battery housing, which is beneficial to further improving the control accuracy of the battery liquid injection amount.

[0055] In addition, in some embodiments, refer to Figure 3 , the orthographic projection of the battery liquid injection device facing the top cover 4 is located within the outer contour of the top cover 4. That is, after the battery liquid injection device is connected to the top cover 4, the battery liquid injection device does not protrude from the side of the top cover 4. When batch injecting liquid into the battery, adjacent batteries can be placed in contact with each other, which is beneficial to reducing the occupation of horizontal space by the battery liquid injection device.

[0056] Correspondingly, an embodiment of the present application provides a battery, including a top cover 4, and the top cover 4 is provided with a liquid injection hole 40. This battery applies the above-mentioned battery liquid injection device, and at least part of the connecting portion 11 of the above-mentioned battery liquid injection device can be embedded in the liquid injection hole 40, and the connecting portion 11 is detachably connected to the top cover 4. This battery can be applied to devices such as electronic devices, energy storage devices, or power vehicles, which will not be elaborated here.

[0057] Embodiment 2:

[0058] Refer to Figures 5 to 7 , the difference between this embodiment and Embodiment 1 is that the second seal 3 surrounds the main body 10 and is connected to the main body 10.

[0059] The second seal 3 can also be made of rubber material. After the connecting portion 11 is threadedly connected to the liquid injection hole 40, the second seal 3 abuts against the top cover 4 and the main body 10, thereby covering and sealing the outside of the liquid injection hole 40 and improving the sealing effect at the liquid injection hole 40.

[0060] The above has introduced in detail a battery liquid injection device and a battery provided by the embodiments of the present application, and specific examples have been used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery filling device, characterized in that: include: A liquid injection shell (1), the liquid injection shell (1) comprising a main body (10) and a connecting portion (11) connected to the main body (10), the main body (10) having a liquid storage cavity (100) and a liquid inlet (101) connected to the liquid storage cavity (100), the connecting portion (11) having a liquid infusion channel (110) connected to the liquid storage cavity (100), the connecting portion (11) being used for detachably connecting to a battery and connecting the liquid storage cavity (100) and the liquid injection hole (40) of the battery; A first sealing member (2), wherein the first sealing member (2) is detachably connected to the main body (10) to seal the liquid inlet (101).

2. The battery liquid injection device according to claim 1, characterized in that: The battery liquid injection device has a first direction (X), and the liquid inlet (101), the liquid storage cavity (100) and the liquid infusion channel (110) are distributed in sequence along the first direction (X).

3. The battery liquid filling device according to claim 2, characterized in that: The flow area of ​​the liquid storage chamber (100) along the first direction (X) at least partially decreases from close to the liquid inlet (101) to close to the liquid infusion channel (110).

4. The battery liquid filling device according to claim 3, characterized in that: The liquid storage cavity (100) comprises a liquid storage sub-cavity (1000) and a flow guiding cavity (1001) connected to the liquid storage sub-cavity (1000), and the liquid inlet (101), the liquid storage sub-cavity (1000), the flow guiding cavity (1001) and the liquid infusion channel (110) are sequentially distributed along the first direction (X); The flow area of ​​the liquid storage sub-chamber (1000) along the first direction (X) is greater than the flow area of ​​the flow guiding chamber (1001) along the first direction (X).

5. The battery liquid filling device according to claim 4, characterized in that: The flow area of ​​the flow guiding cavity (1001) along the first direction (X) decreases gradually from close to the liquid inlet (101) to close to the liquid infusion channel (110).

6. The battery liquid injection device according to claim 3, characterized in that: The flow area of ​​the liquid storage chamber (100) along the first direction (X) decreases gradually from close to the liquid inlet (101) to close to the liquid infusion channel (110).

7. The battery liquid injection device according to claim 1, characterized in that: The battery injection device also includes: A second sealing member (3), the second sealing member (3) surrounds and is connected to the liquid injection shell (1), and the second sealing member (3) is used to abut against the liquid injection shell (1) and the battery to seal the liquid injection hole (40) of the battery.

8. The battery liquid filling device according to claim 1, characterized in that: At least a portion of the connecting portion (11) is inserted into the liquid injection hole (40) of the battery, and the connecting portion (11) is threadedly connected to the hole wall of the liquid injection hole (40).

9. The battery liquid filling device according to claim 1, characterized in that: The liquid injection shell (1) is made of a transparent material.

10. A battery, characterized in that: The invention comprises a top cover (4), wherein the top cover (4) is provided with a liquid injection hole (40), wherein the liquid injection hole (40) can be used for at least part of the connecting part (11) of the battery liquid injection device according to any one of claims 1 to 9 to be embedded, and the connecting part (11) can be detachably connected to the top cover (4).

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