Flow guide structure applied to battery liquid injection

Abstract

The utility model discloses a diversion structure applied to battery liquid injection, which comprises a diversion block, a plurality of diversion grooves are arranged on the diversion block, the diversion grooves extend from the top of the diversion block to the side wall of the diversion block, an electrolyte concentration groove is further arranged on the top of the diversion block, and each diversion groove is communicated with the electrolyte concentration groove. And the diversion trench is used for enabling the electrolyte to flow in a direction far away from the center of the battery roll core hole. Therefore, the electrolyte injected into the battery roll core hole can be concentrated and converged into the electrolyte concentration groove, and then passes through the diversion groove in the diversion block, so that the electrolyte can flow along the diversion groove in the direction far away from the center of the battery roll core hole, and even if the electrolyte cannot directly enter the bottom of the battery through the battery roll core hole, the electrolyte can be prevented from entering the battery. Instead, the electrolyte flows to the battery roll core from the peripheral side of the flow guide block, so that the electrolyte is guided, and the battery roll core can be fully infiltrated by the electrolyte.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production technical field especially is related to a flow guide structure for battery liquid injection. BACKGROUND

[0002] In the production and manufacturing process of the battery, the battery is usually needed to inject electrolyte. The electrolyte usually plays the role of ion transmission between the positive and negative electrodes of the battery. For lithium ion batteries, the electrolyte is generally composed of lithium salt and organic solvent. For sodium ion batteries, the electrolyte is generally composed of sodium salt and organic solvent. For alkaline nickel-hydrogen batteries and alkaline nickel-zinc batteries, the electrolyte is generally composed of alkali metal hydroxide (sodium hydroxide, lithium hydroxide, potassium hydroxide) and aqueous solvent. For lead-acid batteries, the electrolyte is generally composed of sulfuric acid and aqueous solvent. The quality of the injected electrolyte can directly determine the performance of the battery.

[0003] Taking a cylindrical battery as an example, the cylindrical battery is a battery with a cylindrical shape, which is usually composed of a positive electrode, a negative electrode, a separator layer and an electrolyte. The positive electrode, the negative electrode and the separator layer form a battery winding core through winding under the auxiliary action of a winding needle. The cross section of the winding needle is usually circular or polygonal structure. Generally, after the winding process, a battery winding core hole is left in the middle of the battery winding core. However, when the cylindrical battery is injected with electrolyte, the electrolyte has the opportunity to directly enter the bottom of the battery through the battery winding core hole due to the existence of the battery winding core hole, causing liquid accumulation at the bottom of the battery, and thus the injected electrolyte cannot fully soak the winding core.

[0004] It should be pointed out that the electrolyte soaking condition of the cylindrical battery winding core plays a decisive role in the discharge capacity and cycle life of the battery. Especially for full-tab cylindrical battery technology, when the electrolyte directly enters the bottom of the battery through the winding core hole, the metal current collector plate at the bottom does not have the ability to absorb the electrolyte, not only causing the liquid accumulation at the bottom to not participate in the electrochemical reaction, resulting in a decrease in discharge capacity, but also causing uneven electrolyte soaking in the winding core, which seriously affects the cycle life of the battery. Therefore, the electrolyte soaking condition in the battery winding core is crucial for further improving the performance of the battery.

[0005] In view of the above, a flow guide structure for battery liquid injection is proposed to guide the electrolyte during the injection of electrolyte. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the deficiencies in the prior art, and provides a flow guide structure for battery liquid injection to guide the electrolyte during the injection of electrolyte.

[0007] The utility model discloses a purpose is realized through following technical schemes:

[0008] A flow guide structure applied to battery liquid injection, it includes: flow guide block, be equipped with a plurality of flow guide groove on the flow guide block, the flow guide groove extends from the top of the flow guide block to the side wall of the flow guide block, and the top of the flow guide block is also equipped with electrolyte concentration groove, each flow guide groove is communicated with the electrolyte concentration groove, and the flow guide groove is used to make electrolyte flow to the direction away from the battery roll core hole center.

[0009] In one embodiment, the cross section of the flow guide block is circular or polygonal.

[0010] In one embodiment, each flow guide groove is circularly or polygonally distributed.

[0011] In one embodiment, the flow guide groove has a guide inclined portion, and the inclination angle of the guide inclined portion relative to the center line of the flow guide block is 5°-85°.

[0012] In one embodiment, the inclination angle of the guide inclined portion relative to the center line of the flow guide block is 45°.

[0013] In one embodiment, the top of the flow guide block is also provided with a guide inclined surface.

[0014] In one embodiment, it also includes a pulling piece, one end of the pulling piece is connected with the flow guide block, and the other end of the pulling piece extends away from the flow guide block.

[0015] In one embodiment, the flow guide block is a plastic flow guide block.

[0016] In one embodiment, it also includes a waterproof layer, and the waterproof layer is arranged at the bottom of the flow guide block.

[0017] In one embodiment, the waterproof layer is an organic solvent-resistant waterproof layer or an alkali-resistant waterproof layer.

[0018] Compared with the prior art, the utility model has at least the following advantages:

[0019] 1. The utility model proposes a diversion structure for battery liquid injection. By placing a diversion block in the battery core hole and providing a diversion groove and an electrolyte concentration groove on the diversion block, the electrolyte injected into the battery core hole can be concentrated and converged into the electrolyte concentration groove. Then, through the diversion groove on the diversion block, the electrolyte can flow along the diversion groove away from the center of the battery core hole. In other words, the electrolyte cannot directly enter the bottom of the battery through the battery core hole. Instead, it flows from the sides of the diversion block to the battery core, achieving electrolyte diversion, ensuring that the battery core can be fully infiltrated by the electrolyte, thereby improving the performance and cycle life of the battery.

[0020] 2. The utility model proposes a flow guide structure for battery liquid injection. By making the flow guide grooves on the flow guide block have an array distribution structure, that is, the flow guide grooves are arranged at the same intervals, it can further ensure that the electrolyte is fully and evenly infiltrated into all positions of the battery coil, thereby improving the consistency and reliability of battery performance.

[0021] 3. This utility model proposes a flow guide structure for battery injection. By adding a pull-out member to the flow guide block, the flow guide block can be removed after the battery electrolyte injection operation is completed. Therefore, the flow guide block does not compress the thickness expansion space of the battery electrode during the charging and discharging process, while also reducing the weight of the battery and improving the battery's mass energy density.

[0022] 4. The utility model proposes a diversion structure for battery liquid injection, which prevents the electrolyte from penetrating to the bottom of the diversion block by providing a waterproof layer at the bottom of the diversion block, thereby preventing the electrolyte from flowing into the bottom of the battery through the battery coil core hole, causing the electrolyte to be unable to participate in the electrochemical reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments.

[0024] Figure 1 This is a schematic diagram of a flow guide structure for battery injection in an embodiment of the present invention in use on a cylindrical battery;

[0025] Figure 2 This is a schematic structural diagram of a flow guide structure used for battery liquid injection in one embodiment of the present utility model;

[0026] Figure 3 for Figure 2 A schematic cross-sectional view of a flow guide structure for battery injection;

[0027] Figure 4 for Figure 2Structure diagram of structure with pulling member applied to flow guide structure for battery electrolyte injection. DETAILED DESCRIPTION

[0028] For the convenience of understanding the present application, the present application will be described more fully below with reference to the accompanying drawings.

[0029] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a flow guide structure 300 applied to battery electrolyte injection includes: a flow guide block 310, a plurality of flow guide grooves 311 are formed on the flow guide block 310, the flow guide grooves 311 extend from the top of the flow guide block 310 to the side wall of the flow guide block 310, and an electrolyte concentration groove 312 is also formed on the top of the flow guide block 310, each flow guide groove 311 is in communication with the electrolyte concentration groove 312, and the flow guide groove 311 is used to make the electrolyte flow away from the center of the battery roll core hole 210.

[0030] It should be noted that, as shown in Figure 1 , the use state diagram of the flow guide structure 300 applied to battery electrolyte injection on a cylindrical battery, the cylindrical battery includes a shell 100 and a battery roll core 200, the battery roll core 200 is wound by a negative electrode sheet, a diaphragm layer and a positive electrode sheet, and the shell 100 is provided with a containing cavity; the battery roll core 200 is contained in the containing cavity, and the battery roll core 200 is formed with a battery roll core hole 210, and the flow guide structure 300 is contained in the battery roll core hole 210; when the electrolyte injection operation is performed, the electrolyte injected into the battery roll core hole 210 is first concentrated and flows into the electrolyte concentration groove 312, and then flows to the four sides of the battery roll core hole 210 in a divergent manner along the flow guide groove 311, that is, the electrolyte 20 flows away from the center of the battery roll core hole 210; in this way, the electrolyte 20 cannot directly enter the bottom of the battery through the battery roll core hole 210, but flows to the battery roll core 200 from the four sides of the flow guide block 310, realizing the flow guide of the electrolyte 20, so as to ensure that the battery roll core 200 can be fully soaked by the electrolyte 20.

[0031] Preferably, the cross section of the flow guide block 310 is in a circular structure or a polygonal structure. The shape structure of the cross section of the flow guide block 310 matches the cross section structure of the battery roll core hole 210, for example, a circular structure or a polygonal structure. In the embodiment, each flow guide groove 311 is in a circular array distribution or a polygonal array distribution, that is, when the cross section of the flow guide block 310 is in a circular structure, the flow guide groove 311 is in a circular array distribution, and when the cross section of the flow guide block 310 is in a polygonal structure, the flow guide groove 311 is in a polygonal array distribution. In this way, each flow guide groove 311 can be arrayed at the same interval distance, so that the electrolyte 20 can be further ensured to be fully and uniformly soaked at each position of the battery roll core 200.

[0032] See also Figure 3 As shown, in one embodiment, the guide groove 311 has a guide inclined portion 311a. The guide inclined portion 311a is inclined at an angle of 5°-85° relative to the centerline of the guide block 310. The guide inclined portion 311a allows the electrolyte 20 to flow obliquely along the guide inclined portion 311a toward the battery roll 200, rather than flowing directly to the bottom of the battery through the battery roll hole 210. Preferably, the guide inclined portion 311a is inclined at a 45° angle relative to the centerline of the guide block 310.

[0033] In one embodiment, the top of the guide block 310 is further provided with a guide inclined surface 313. The guide inclined surface 313 is provided around the edges of the top of the guide block. When the electrolyte 20 flows to the top of the guide block 310, it can be further guided by the guide inclined surface 313 to ensure that the electrolyte 20 can fully flow to the battery core 200 around the battery core hole 210.

[0034] See also Figure 4 As shown, in one embodiment, the diversion structure 300 for battery liquid injection further includes a drawer 320. One end of the drawer 320 is connected to the diversion block 310, and the other end of the drawer 320 extends away from the diversion block 310. When the diversion block 310 needs to be removed, the drawer 320 can be used to remove the diversion block 310. For example, the drawer 320 can be a metal wire or a plastic handle.

[0035] See also Figure 1 and Figure 3As shown, in one embodiment, the guide block is a plastic guide block. The plastic material is relatively soft and can avoid scratching the battery core 200. In this embodiment, the guide structure used for battery injection also includes a waterproof layer 330, and the waterproof layer 330 is arranged at the bottom of the guide block 310. In this way, the waterproof layer 330 can further prevent the electrolyte 20 from penetrating through the guide block 310 to the bottom of the guide block 310, and further prevent the electrolyte from flowing from the bottom of the guide block 310 along the battery core hole 210 to the bottom of the battery. Specifically, the waterproof layer 330 is an organic solvent-resistant waterproof layer or an alkali-resistant waterproof layer. When selecting a waterproof layer, it is necessary to match the material properties of the waterproof layer 330 according to the properties of the electrolyte components in different battery systems. For example, in lithium-ion batteries or sodium-ion battery systems, an organic solvent-resistant waterproof layer 330 is required, while in alkaline nickel-hydrogen batteries or alkaline nickel-zinc battery systems, an alkali-resistant waterproof layer 330 is required. For example, the waterproof layer 330 can be made of waterproof adhesive tape, but is not limited to waterproof adhesive tape. It can also be other waterproof coatings that are resistant to organic solvents or alkalis. For example, for lithium-ion batteries, the base layer of the waterproof adhesive tape can be made of polytetrafluoroethylene, polyimide, polyethylene, polypropylene and other materials that are resistant to organic solvents and have waterproof and hydrophobic properties; and for alkaline nickel-metal hydride batteries or alkaline nickel-zinc batteries, the base layer of the waterproof adhesive tape can be made of polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene and other materials that are resistant to alkalis and have waterproof and hydrophobic properties.

[0036] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A flow guide structure for battery injection, characterized in that: include: A guide block is provided with a plurality of guide grooves, which extend from the top of the guide block to the side wall of the guide block, and an electrolyte concentration tank is also provided on the top of the guide block. Each of the guide grooves is connected to the electrolyte concentration tank, and the guide grooves are used to make the electrolyte flow away from the center of the battery roll core hole.

2. The flow guide structure for battery injection according to claim 1, characterized in that: The cross section of the guide block is a circular structure or a polygonal structure.

3. The flow guide structure for battery injection according to claim 2, characterized in that: The guide grooves are distributed in a circular array or a polygonal array.

4. The flow guide structure for battery injection according to claim 2, characterized in that: The guide groove has a guide inclined portion, and the inclination angle of the guide inclined portion relative to the center line of the guide block is 5°-85°.

5. The flow guide structure for battery liquid injection according to claim 4, characterized in that: The inclination angle of the guide inclined portion relative to the center line of the guide block is 45°.

6. The flow guide structure for battery liquid injection according to any one of claims 1 to 5, characterized in that: The top of the guide block is also provided with a guide inclined surface.

7. The flow guide structure for battery liquid injection according to any one of claims 1 to 5, characterized in that: It also includes a drawer, one end of which is connected to the guide block, and the other end of which extends in a direction away from the guide block.

8. The flow guide structure for battery liquid injection according to any one of claims 1 to 5, characterized in that: The guide block is a plastic guide block.

9. The flow guide structure for battery liquid injection according to claim 8, characterized in that: It also includes a waterproof layer, which is arranged at the bottom of the guide block.

10. The flow guide structure for battery liquid injection according to claim 9, characterized in that: The waterproof layer is an organic solvent-resistant waterproof layer or an alkali-resistant waterproof layer.

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