Liquid injection structure and cylindrical battery

Abstract

The utility model discloses a liquid injection structure and a cylindrical battery, and relates to the technical field of batteries. The liquid injection structure comprises a liquid injection assembly and a shunting assembly, the liquid injection assembly comprises a pole, a first liquid injection part and a second liquid injection part, the first liquid injection part and the second liquid injection part are symmetrically arranged relative to the pole, and the first liquid injection part and the second liquid injection part are used for alternately injecting electrolyte into a battery cell; and the shunting assembly is arranged on one side of the liquid injection assembly and is used for guiding and shunting the electrolyte injected from the first liquid injection part and the second liquid injection part so as to prevent the electrolyte from impacting a core package in the battery core. According to the invention, the dispersion effect of the electrolyte can be improved, the liquid injection effect of the battery is improved, the wettability of the pole piece is improved, and meanwhile, the liquid injection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection structure and a cylindrical battery. Background Art

[0002] Currently, many types of lithium batteries use a cylindrical structure manufacturing process. The internal structure uses a sheet-like positive electrode, a sheet-like negative electrode and a separator paper to be stacked and wound into a battery core, which is then placed in a steel shell and finally injected with electrolyte to assemble into a battery. The sheet-like winding structure of the positive and negative electrodes of the battery has many advantages. For example, the positive and negative electrodes are in sheet form, which effectively increases the reaction area of ​​the battery electrodes, allowing the battery to discharge with large current and high power; effectively improves the utilization rate of the battery's active substances; the manufacturing process is simple and easy to produce on an automated assembly line.

[0003] The injection hole structure of the current cylindrical battery is located on one side of the central axis of the battery cell. In order to improve the efficiency and the wettability of the electrode, the battery is usually injected at isobaric or negative pressure. Since the battery structure is cylindrical, when the shell is subjected to pressure, the radial forces offset each other, resulting in low injection efficiency and long injection time. In addition, when the single-sided injection hole structure is injected, the electrode wetting efficiency is low, and a long static time is required, and the electrode close to the injection hole area is usually wetted first. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a liquid injection structure and a cylindrical battery, aiming to solve the technical problems in the prior art.

[0005] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a liquid injection structure, comprising:

[0007] A liquid injection assembly, the liquid injection assembly comprising a pole, a first liquid injection part and a second liquid injection part, the first liquid injection part and the second liquid injection part are symmetrically arranged relative to the pole, and the first liquid injection part and the second liquid injection part are used to alternately inject electrolyte into the battery cell;

[0008] A shunt component is arranged on one side of the injection component, and is used to guide and shunt the electrolyte injected from the first injection part and the second injection part to prevent the electrolyte from impacting the core bag in the battery cell.

[0009] In one of the embodiments of the first aspect, the injection assembly further includes a top cover sheet, which is arranged on a side of the shunt assembly away from the core package, the pole is passed through the top cover sheet, and the top cover sheet has the first injection part and the second injection part, which are symmetrically arranged on the top cover sheet relative to the pole.

[0010] In one embodiment of the first aspect, the first liquid injection part includes a first liquid injection hole, which is arranged on the top cover sheet and is located on one side of the pole. The axis of the first liquid injection hole is parallel to the axis of the pole, and the first liquid injection hole is used to inject electrolyte into the battery cell and discharge exhaust gas inside the battery cell.

[0011] In one embodiment of the first aspect, the second liquid injection part includes a second liquid injection hole, which is arranged on the top cover sheet, and the second liquid injection hole and the first liquid injection hole are symmetrically arranged relative to the pole, the axis of the second liquid injection hole is parallel to the axis of the first liquid injection hole, and the second liquid injection hole is used to inject electrolyte into the battery cell and discharge exhaust gas inside the battery cell.

[0012] In one embodiment of the first aspect, the flow diversion component includes:

[0013] An insulating plate, the insulating plate is arranged on a side of the top cover sheet close to the core package, and the insulating plate is fixedly connected to the top cover sheet;

[0014] a first shunt portion, the first shunt portion being arranged on a side of the insulating plate away from the top cover sheet, the first shunt portion being arranged corresponding to the first injection hole, and the first shunt portion being used to guide and shunt the electrolyte injected into the first injection hole;

[0015] The second shunt portion is arranged on the side of the insulating plate away from the top cover plate, the second shunt portion is arranged corresponding to the second injection hole, and the second shunt portion is used to guide and shunt the electrolyte injected into the second injection hole.

[0016] In one embodiment of the first aspect, the insulating plate has a first through hole and a second through hole:

[0017] The first through hole is arranged corresponding to the first injection hole, the axis of the first through hole is parallel to the axis of the first injection hole, and the first through hole is located between the first diversion portion and the first injection hole;

[0018] The second through hole is arranged corresponding to the second liquid injection hole, and the axis of the second through hole is parallel to the axis of the second liquid injection hole. The second through hole is located between the second diversion part and the second liquid injection hole.

[0019] In one embodiment of the first aspect, the first diversion portion includes a first baffle, which is arranged on a side of the insulating plate away from the top cover plate, the first baffle is arranged corresponding to the first through hole, and a first guide channel is formed between the first baffle and the insulating plate, and the first baffle is used to divert the electrolyte injected from the first injection hole and prevent the electrolyte injected from the first injection hole from impacting the core package.

[0020] In one embodiment of the first aspect, the second diversion portion includes a second baffle, which is arranged on a side of the insulating plate away from the top cover plate, the second baffle is arranged corresponding to the second through hole, and a second guide channel is formed between the second baffle and the insulating plate, and the second baffle is used to divert the electrolyte injected from the second injection hole and prevent the electrolyte injected from the second injection hole from impacting the core package.

[0021] In one embodiment of the first aspect, the first diverter portion further includes a first connecting plate, which is disposed between the first baffle plate and the insulating plate, one end of the first connecting plate is connected to the first baffle plate, and one end of the first connecting plate away from the first baffle plate is connected to the insulating plate.

[0022] In a second aspect, an embodiment of the present application provides a cylindrical battery, comprising the liquid injection structure described in any of the above embodiments.

[0023] Compared with the prior art, the beneficial effect of the present application is as follows: the present application proposes a liquid injection structure and a cylindrical battery. The liquid injection structure includes a liquid injection component and a shunt component, the liquid injection component includes a pole, a first liquid injection part and a second liquid injection part, the first liquid injection part and the second liquid injection part are symmetrically arranged relative to the pole, and the first liquid injection part and the second liquid injection part are used to alternately inject electrolyte into the battery cell; the shunt component is arranged on one side of the liquid injection component, and the shunt component is used to guide and shunt the electrolyte injected from the first liquid injection part and the second liquid injection part to prevent the electrolyte from impacting the core pack in the battery cell. The present application arranges the first liquid injection part and the second liquid injection part in the liquid injection component symmetrically relative to the pole, so that the first liquid injection part and the second liquid injection part can alternately inject electrolyte into the battery cell, and guides and shunts the injected electrolyte through the shunt component, thereby improving the dispersion effect of the electrolyte, improving the liquid injection effect of the battery, improving the wettability of the pole piece, and improving its liquid injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the liquid injection structure in the present application is shown;

[0026] Figure 2 Another three-dimensional structural schematic diagram of the liquid injection structure in the present application is shown;

[0027] Figure 3 A schematic diagram of the three-dimensional structure of the liquid injection assembly in the present application is shown;

[0028] Figure 4 A schematic diagram of the three-dimensional structure of the flow diversion component in the present application is shown;

[0029] Figure 5 Another three-dimensional structural schematic diagram of the flow diversion component in the present application is shown;

[0030] Figure 6 Another three-dimensional structural schematic diagram of the diversion component in the present application is shown.

[0031] Description of main component symbols:

[0032] 100-liquid injection structure; 110-liquid injection assembly; 111-top cover plate; 1111-first liquid injection part; 1111a-first liquid injection hole; 1112-second liquid injection part; 1112a-second liquid injection hole; 112-pole; 120-shunt assembly; 121-insulating plate; 1211-first through hole; 1212-second through hole; 122-first shunt part; 1221-first baffle; 1222-first connecting plate; 1223-first guide channel; 123-second shunt part; 1231-second baffle; 1232-second connecting plate; 1233-second guide channel. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a liquid injection structure 100. The liquid injection structure 100 includes a liquid injection component 110 and a flow diversion component 120.

[0039] Among them, the injection assembly 110 includes a pole 112, a first injection part 1111 and a second injection part 1112, the first injection part 1111 and the second injection part 1112 are symmetrically arranged relative to the pole 112, and the first injection part 1111 and the second injection part 1112 are used to alternately inject electrolyte into the battery cell.

[0040] In addition, the diversion component 120 is arranged on one side of the injection component 110, and the diversion component 120 is used to guide and divert the electrolyte injected from the first injection part 1111 and the second injection part 1112 to prevent the electrolyte from impacting the core package in the battery cell.

[0041] In the related art, the injection hole structure of the current cylindrical battery is located on one side of the central axis of the battery cell. In order to improve the efficiency and the wettability of the electrode, the battery is usually injected at isobaric or negative pressure. Since the battery structure is cylindrical, when the shell is subjected to pressure, the radial forces offset each other, resulting in low injection efficiency and long injection time. In addition, when the single-sided injection hole structure is injected, the electrode wetting efficiency is low, and a long static time is required, and the electrode close to the injection hole area is usually wetted first.

[0042] In this embodiment, the injection structure 100 includes an injection component 110 and a shunt component 120. In this embodiment, the first injection part 1111 and the second injection part 1112 in the injection component 110 are symmetrically arranged relative to the pole 112, so that the first injection part 1111 and the second injection part 1112 can alternately inject electrolyte into the battery cell, and the injected electrolyte is guided and shunted by the shunt component 120, thereby improving the dispersion effect of the electrolyte, the injection effect of the battery, the wettability of the pole piece, and the injection efficiency.

[0043] Alternatively, if Figure 3 As shown, the liquid injection assembly 110 also includes a top cover sheet 111 .

[0044] The top cover sheet 111 is disposed on a side of the shunt component 120 away from the core package, and the pole 112 is penetrated through the top cover sheet 111 .

[0045] Specifically, the top cover sheet 111 has the first liquid injection portion 1111 and the second liquid injection portion 1112 , and the first liquid injection portion 1111 and the second liquid injection portion 1112 are symmetrically arranged on the top cover sheet 111 with respect to the pole 112 .

[0046] Alternatively, if Figure 3 As shown, the first liquid injection portion 1111 includes a first liquid injection hole 1111a.

[0047] The first liquid injection hole 1111 a is disposed on the top cover sheet 111 , and the first liquid injection hole 1111 a is located at one side of the pole 112 , and the axis of the first liquid injection hole 1111 a is parallel to the axis of the pole 112 .

[0048] In this embodiment, electrolyte is injected into the battery cell through the first injection hole 1111a, and waste gas inside the battery cell is discharged in time, thereby reducing the probability of lithium or sodium precipitation in the battery cell.

[0049] Alternatively, if Figure 3 As shown, the second liquid injection portion 1112 includes a second liquid injection hole 1112a.

[0050] The second injection hole 1112a is provided on the top cover sheet 111, and the second injection hole 1112a and the first injection hole 1111a are symmetrically arranged relative to the pole 112, and the axis of the second injection hole 1112a is parallel to the axis of the first injection hole 1111a. In this embodiment, electrolyte is injected into the battery cell through the second injection hole 1112a, and waste gas generated in the battery cell is discharged in time, thereby reducing the probability of lithium or sodium precipitation in the battery cell.

[0051] It should be noted that the first injection hole 1111a and the second injection hole 1112a are arranged in a one-to-one correspondence, and this embodiment does not limit the number of the first injection holes 1111a and the second injection holes 1112a. The specific number of the first injection holes 1111a and the specific number of the second injection holes 1112a can be designed according to actual production requirements.

[0052] Optionally, in this embodiment, the number of the first liquid injection hole 1111a and the number of the second liquid injection hole 1112a are, for example, one each.

[0053] Alternatively, if Figure 5 As shown, the diverter assembly 120 includes an insulating plate 121 , a first diverter portion 122 and a second diverter portion 123 .

[0054] The insulating plate 121 is disposed on a side of the top cover sheet 111 close to the core package, and the insulating plate 121 is fixedly connected to the top cover sheet 111 , and the fixed connection method is, for example, snap-on connection.

[0055] Optionally, the insulating plate 121 is made of, for example, plastic material.

[0056] In addition, the first diverter portion 122 is disposed on a side of the insulating plate 121 away from the top cover plate 111 , and the first diverter portion 122 is disposed corresponding to the first liquid injection hole 1111 a .

[0057] In this embodiment, the electrolyte injected into the first injection hole 1111a is guided and diverted by the first diversion part 122, so that the electrolyte injected into the first injection hole 1111a flows dispersedly in the battery cell and the electrolyte is prevented from impacting the core pack in the battery cell, thereby improving the dispersion effect of the electrolyte and the injection effect of the battery cell.

[0058] In addition, the second diverter portion 123 is disposed on a side of the insulating plate 121 away from the top cover plate 111 , and the second diverter portion 123 is disposed corresponding to the second liquid injection hole 1112 a .

[0059] In this embodiment, the electrolyte injected into the second injection hole 1112a is guided and diverted by the second diversion portion 123, so that the electrolyte injected into the second injection hole 1112a flows dispersedly in the battery cell and the electrolyte is prevented from impacting the core pack in the battery cell, thereby improving the dispersion effect of the electrolyte.

[0060] Alternatively, if Figure 4 As shown, the insulating plate 121 has a first through hole 1211 and a second through hole 1212 .

[0061] The first through hole 1211 is arranged corresponding to the first injection hole 1111a, the axis of the first through hole 1211 is parallel to the axis of the first injection hole 1111a, and the first through hole 1211 is located between the first diversion part 122 and the first injection hole 1111a.

[0062] The second through hole 1212 is arranged corresponding to the second injection hole 1112a, and the axis of the second through hole 1212 is parallel to the axis of the second injection hole 1112a. The second through hole 1212 is located between the second diversion portion 123 and the second injection hole 1112a.

[0063] Alternatively, if Figure 6 As shown, the first diverter portion 122 includes a first baffle 1221 , which is disposed on a side of the insulating plate 121 away from the top cover plate 111 , and the first baffle 1221 is disposed corresponding to the first through hole 1211 .

[0064] A first guide channel 1223 is formed between the first baffle 1221 and the insulating plate 121 , and the electrolyte injected from the first injection hole 1111 a sequentially passes through the first through hole 1211 and the first guide channel 1223 into the battery cell.

[0065] In this embodiment, the electrolyte injected into the first injection hole 1111a is diverted by the first baffle 1221, which can prevent the electrolyte from impacting the core pack in the battery cell, while improving the dispersion effect of the electrolyte and the injection effect.

[0066] Alternatively, if Figure 6 As shown, the second flow dividing portion 123 includes a second baffle 1231 . The second baffle 1231 is disposed on a side of the insulating plate 121 away from the top cover plate 111 . The second baffle 1231 is disposed corresponding to the second through hole 1212 .

[0067] A second guide channel 1233 is formed between the second baffle 1231 and the insulating plate 121 , and the electrolyte injected from the second injection hole 1112 a enters the battery cell through the second through hole 1212 and the second guide channel 1233 in sequence.

[0068] In this embodiment, the electrolyte injected from the second injection hole 1112a is diverted by the second baffle 1231, which can prevent the electrolyte injected from the second injection hole 1112a from impacting the core package in the battery cell, while improving the dispersion effect of the electrolyte and the injection effect.

[0069] It should be noted that the present embodiment does not limit the shapes of the first baffle plate 1221 and the second baffle plate 1231 , and the shapes of the first baffle plate 1221 and the second baffle plate 1231 can be designed according to actual production conditions.

[0070] Alternatively, if Figure 6 As shown, the first diverter 122 further includes a first connecting plate 1222, which is disposed between the first baffle 1221 and the insulating plate 121. One end of the first connecting plate 1222 is connected to the first baffle 1221, and one end of the first connecting plate 1222 away from the first baffle 1221 is connected to the insulating plate 121.

[0071] Optionally, in this embodiment, there are three first connecting plates 1222 , for example, the three first connecting plates 1222 are spaced apart between the first baffle 1221 and the insulating plate 121 , and the three first connecting plates 1222 are distributed in a triangular shape, and a first diversion port is provided between two adjacent first connecting plates 1222 .

[0072] In this embodiment, when there are three first connecting plates 1222, there are three first diversion ports. Specifically, the electrolyte injected from the first injection hole 1111a flows into the battery cell through the first through hole 1211, the first guide channel 1223 and the first diversion port in sequence.

[0073] It should be noted that this embodiment does not limit the number of the first connecting plates 1222, and the specific number of the first connecting plates 1222 can be designed according to actual production conditions.

[0074] Alternatively, if Figure 6 As shown, the second diverter 123 further includes a second connecting plate 1232, which is disposed between the second baffle 1231 and the insulating plate 121. One end of the second connecting plate 1232 is connected to the second baffle 1231, and one end of the second connecting plate 1232 away from the second baffle 1231 is connected to the insulating plate 121.

[0075] Optionally, in this embodiment, there are three second connecting plates 1232 , for example, the three second connecting plates 1232 are spaced apart between the second baffle 1231 and the insulating plate 121 , and the three second connecting plates 1232 are distributed in a triangular shape, and a second diversion port is provided between two adjacent second connecting plates 1232 .

[0076] When the present embodiment has three second connecting plates 1232, it also has three second flow diversion ports. Specifically, the electrolyte injected from the second injection hole 1112a flows into the battery cell through the second through hole 1212, the second flow guide channel 1233 and the second flow diversion port in sequence.

[0077] It should be noted that this embodiment does not limit the number of the second connecting plates 1232, and the specific number of the second connecting plates 1232 can be designed according to actual production conditions.

[0078] Optionally, in this embodiment, the insulating plate 121 , the first connecting plate 1222 , the first baffle plate 1221 , the second connecting plate 1232 , and the second baffle plate 1231 are, for example, integrally formed.

[0079] Optionally, the liquid injection method of the liquid injection structure 100 of this embodiment is as follows:

[0080] Step 1: close the first injection hole 1111a, and start injecting liquid into the second injection hole 1112a. The injection amount is 2% to 5% of the total injection amount of the battery cell.

[0081] Step 2: When the injection amount of the second injection hole 1112a reaches 2% to 5% of the total injection amount of the battery cell, the injection of the second injection hole 1112a is suspended and the second injection hole 1112a is closed.

[0082] Step three: further, open the first injection hole 1111a, and start injecting liquid from the first injection hole 1111a, and make the injection amount this time 2% to 5% of the total injection amount of the battery cell.

[0083] Step 4: When the injection amount of the first injection hole 1111a reaches 2% to 5% of the total injection amount of the battery cell, the first injection hole 1111a is closed, and injection begins at the second injection hole 1112a, and the injection amount this time is 6% to 10% of the total injection amount of the battery cell.

[0084] Step 5, when the injection amount of the second injection hole 1112a reaches 6% to 10% of the total injection amount of the battery cell, the injection of the second injection hole 1112a is suspended, and the second injection hole 1112a is closed, and then the first injection hole 1111a is opened and the injection is started. The injection amount this time is 6% to 10% of the total injection amount of the battery cell.

[0085] Step 6: Close the first injection hole 1111a, open the second injection hole 1112a and start injection, the injection amount this time is 11% to 15% of the total injection amount of the battery cell. Further, when the injection amount of the second injection hole 1112a reaches 11% to 15% of the total injection amount of the battery cell, suspend the injection of the second injection hole 1112a and close the second injection hole 1112a. Then open the first injection hole 1111a, and start injection at the first injection hole 1111a, and the injection amount this time is 11% to 15% of the total injection amount of the battery cell.

[0086] Step 7: repeat step 6 until the entire battery cell is injected with liquid. It should be noted that the last injection volume can account for any ratio of the total injection volume, but needs to be less than 10% of the total injection volume.

[0087] This embodiment provides a cylindrical battery having the liquid injection structure 100 described in any of the above embodiments, and thus having all the beneficial effects of the liquid injection structure 100, which will not be described in detail here.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A liquid injection structure, characterized in that: include: A liquid injection assembly, the liquid injection assembly comprising a pole, a first liquid injection part and a second liquid injection part, the first liquid injection part and the second liquid injection part are symmetrically arranged relative to the pole, and the first liquid injection part and the second liquid injection part are used to alternately inject electrolyte into the battery cell; A shunt component is arranged on one side of the injection component, and is used to guide and shunt the electrolyte injected from the first injection part and the second injection part to prevent the electrolyte from impacting the core bag in the battery cell.

2. The liquid injection structure according to claim 1, characterized in that: The injection assembly also includes a top cover sheet, which is arranged on the side of the shunt assembly away from the core package, and the pole is passed through the top cover sheet. The top cover sheet has the first injection part and the second injection part, and the first injection part and the second injection part are symmetrically arranged on the top cover sheet relative to the pole.

3. The liquid injection structure according to claim 2, characterized in that: The first liquid injection part includes a first liquid injection hole, which is arranged on the top cover sheet and is located on one side of the pole. The axis of the first liquid injection hole is parallel to the axis of the pole. The first liquid injection hole is used to inject electrolyte into the battery cell and discharge waste gas inside the battery cell.

4. The liquid injection structure according to claim 3, characterized in that: The second liquid injection part includes a second liquid injection hole, which is arranged on the top cover sheet, and the second liquid injection hole and the first liquid injection hole are symmetrically arranged relative to the pole, the axis of the second liquid injection hole is parallel to the axis of the first liquid injection hole, and the second liquid injection hole is used to inject electrolyte into the battery cell and discharge exhaust gas inside the battery cell.

5. The liquid injection structure according to claim 4, characterized in that: The diversion component comprises: An insulating plate, the insulating plate is arranged on a side of the top cover sheet close to the core package, and the insulating plate is fixedly connected to the top cover sheet; a first shunt portion, the first shunt portion being arranged on a side of the insulating plate away from the top cover sheet, the first shunt portion being arranged corresponding to the first injection hole, and the first shunt portion being used to guide and shunt the electrolyte injected into the first injection hole; The second shunt portion is arranged on the side of the insulating plate away from the top cover plate, the second shunt portion is arranged corresponding to the second injection hole, and the second shunt portion is used to guide and shunt the electrolyte injected into the second injection hole.

6. The liquid injection structure according to claim 5, characterized in that: The insulating plate has a first through hole and a second through hole: The first through hole is arranged corresponding to the first injection hole, the axis of the first through hole is parallel to the axis of the first injection hole, and the first through hole is located between the first diversion portion and the first injection hole; The second through hole is arranged corresponding to the second liquid injection hole, and the axis of the second through hole is parallel to the axis of the second liquid injection hole. The second through hole is located between the second diversion part and the second liquid injection hole.

7. The liquid injection structure according to claim 6, characterized in that: The first diversion portion includes a first baffle, which is arranged on a side of the insulating plate away from the top cover plate, the first baffle is arranged corresponding to the first through hole, and a first guide channel is formed between the first baffle and the insulating plate. The first baffle is used to divert the electrolyte injected from the first injection hole and prevent the electrolyte injected from the first injection hole from impacting the core package.

8. The liquid injection structure according to claim 6, characterized in that: The second diversion portion includes a second baffle, which is arranged on the side of the insulating plate away from the top cover plate, the second baffle is arranged corresponding to the second through hole, and a second guide channel is formed between the second baffle and the insulating plate. The second baffle is used to divert the electrolyte injected from the second injection hole and prevent the electrolyte injected from the second injection hole from impacting the core package.

9. The liquid injection structure according to claim 7, characterized in that: The first diverter portion further includes a first connecting plate, which is disposed between the first baffle plate and the insulating plate, one end of the first connecting plate is connected to the first baffle plate, and one end of the first connecting plate away from the first baffle plate is connected to the insulating plate.

10. A cylindrical battery, characterized in that: The invention comprises the liquid injection structure according to any one of claims 1 to 9.

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