All-tab cylindrical lithium battery positive electrode confluence plate and all-tab cylindrical lithium battery

Abstract

The utility model relates to the technical field of full-tab cylindrical lithium ion battery production, and discloses a full-tab cylindrical lithium battery positive pole confluence plate and a full-tab cylindrical lithium battery, the full-tab cylindrical lithium battery positive pole confluence plate is provided with one or two symmetrical fan-shaped openings, so that the liquid absorption area during electrolyte injection is increased, and the electrolyte injection efficiency is improved. The infiltration effect of the pole piece is effectively improved, the liquid injection time of the battery is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of production of full-pole-ear cylindrical lithium-ion batteries, and in particular to a full-pole-ear cylindrical lithium battery positive electrode busbar and a full-pole-ear cylindrical lithium battery. Background Art

[0002] With the rapid development of the power tool industry, the current application scenarios of power tools are complex, and the performance of traditional lithium-ion batteries faces huge challenges.

[0003] Conventional lithium-ion batteries use a single-pole positive ear design. Under continuous high-current discharge conditions, the temperature rises quickly and the instantaneous high-current performance is insufficient, making them unsuitable for some high-power power tools.

[0004] The use of full-ear cylindrical lithium-ion batteries can greatly improve the above-mentioned problems. However, the positive busbar used in the current full-ear cylindrical lithium-ion batteries has a small liquid absorption area when the electrolyte is injected, resulting in a long battery injection time and affecting production efficiency. Utility Model Content

[0005] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a full-pole-ear cylindrical lithium battery positive busbar and a full-pole-ear cylindrical lithium battery. The full-pole-ear cylindrical lithium battery positive busbar can shorten the battery filling time and improve production efficiency.

[0006] In order to achieve the above-mentioned objectives, the utility model provides, on the one hand, a positive busbar for a full-ear cylindrical lithium battery, comprising a positive busbar body and a conductive connector connected to the positive busbar body, wherein the positive busbar body comprises an injection hole arranged at the center position of the positive busbar body and a fan-shaped opening arranged concentrically with the injection hole.

[0007] In some embodiments, the fan-shaped opening is provided with one, and the central angle of the fan-shaped opening is 10-170°.

[0008] In some embodiments, two fan-shaped openings are provided, and the central angles of the two fan-shaped openings are 10-30° respectively.

[0009] In some embodiments, the two fan-shaped openings are centrally symmetrically arranged about the center of the injection hole.

[0010] In some embodiments, a fuse hole is provided at the connection between the conductive connector and the positive busbar body.

[0011] In some embodiments, two notches are provided at the connection between the conductive connector and the positive busbar body, and the two notches are symmetrically arranged at the two side edges of the connection between the conductive connector and the positive busbar body.

[0012] In some embodiments, the conductive connector and the positive busbar body are an integrated stamped structure.

[0013] The second aspect of the utility model provides a full-pole lug cylindrical lithium battery, wherein the full-pole lug cylindrical lithium battery has the above-mentioned full-pole lug cylindrical battery positive busbar.

[0014] Through the above technical scheme, one or two symmetrical fan-shaped openings are opened on the positive busbar of the full-ear cylindrical lithium battery, which increases the liquid absorption area during electrolyte injection, effectively improves the wetting effect of the electrode, shortens the battery injection time, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the first full-ear cylindrical lithium battery positive busbar provided by the utility model;

[0016] Figure 2 It is a structural schematic diagram of a second full-pole-ear cylindrical lithium battery positive busbar provided by the utility model.

[0017] Description of Reference Numerals

[0018] 1. Positive busbar body; 2. Conductive connector; 3. Liquid injection hole; 4. Fan-shaped opening; 5. Fuse hole; 6. Notch. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0020] It should be noted that, in the description of the present utility model, words such as “include” or “comprises” and the like mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements.

[0021] Combination Figure 1 and Figure 2 As shown, the utility model provides a full-ear cylindrical lithium battery positive busbar, including a positive busbar body 1 and a conductive connector 2 connected to the positive busbar body 1, the positive busbar body 1 includes an injection hole 3 arranged at the center position of the positive busbar body 1 and a fan-shaped opening 4 arranged concentrically with the injection hole 3.

[0022] The inventive concept of the utility model is to open a fan-shaped opening 4 on the positive busbar body 1 to increase the liquid absorption area during electrolyte injection, effectively improve the wetting effect of the pole piece, improve the liquid absorption performance of the pole piece, shorten the battery injection time, and improve production efficiency.

[0023] Specifically, there is one fan-shaped opening 4, and the central angle of the fan-shaped opening 4 is 10-170°; there are two fan-shaped openings 4, and the central angles of the two fan-shaped openings 4 are 10-30° respectively, and the two fan-shaped openings 4 are centrally symmetrically arranged about the center of the injection hole 3.

[0024] Furthermore, a fuse hole 5 is provided at the connection between the conductive connector 2 and the positive busbar body 1. It can be understood that the fuse hole 5 can be of any different shape, size and number; preferably, two notches 6 are provided at the connection between the conductive connector 2 and the positive busbar body 1, and the two notches 6 are symmetrically arranged on both side edges of the connection between the conductive connector 2 and the positive busbar body 1.

[0025] The fuse hole 5 and the notch 6 together form a weak position of the conductive connector 2. When the current exceeds the bearing value, this position is more susceptible to high temperature and quickly melts, which can play a role in overcurrent safety protection.

[0026] In the present invention, the conductive connector 2 and the positive busbar body 1 are a stamped integral structure.

[0027] In the present invention, the preparation method of the full-ear cylindrical lithium battery includes:

[0028] 1. Preparation of positive electrode sheet:

[0029] 1.1. Mix the ternary material, conductive agent, binder and NMP solvent, and stir them in a mixing pot under high kneading;

[0030] 1.2. After stirring for 90-100 minutes, add the remaining NMP and continue stirring to adjust the viscosity to obtain a positive electrode slurry that meets the requirements;

[0031] 1.3. Qualified positive electrode slurry is evenly applied on the front and back sides of the aluminum foil and then dried and rolled to obtain the positive electrode sheet.

[0032] 2. Preparation of negative electrode sheet:

[0033] 2.1. After the negative electrode active material, conductive agent, binder and water are mixed in proportion, high-kneading stirring is performed in a mixing pot;

[0034] 2.2. After stirring for 70-80 minutes, add the remaining water and continue stirring to adjust the viscosity to obtain a negative electrode slurry that meets the requirements;

[0035] 2.3. Qualified negative electrode slurry is evenly applied on the front and back sides of the copper foil and then dried and rolled to obtain the negative electrode sheet.

[0036] 3. Assemble the battery: wind the positive and negative electrodes and the separator, put them into the shell, flatten them, inject liquid, weld the busbar, seal them, and finally produce a full-ear cylindrical lithium battery.

[0037] In view of the above-mentioned preparation method, the utility model provides a full-ear cylindrical lithium battery, including a positive busbar body 1, on which one or two symmetrical fan-shaped holes are opened to improve the current situation of slow liquid injection of the battery cell and improve the liquid absorption of the electrode.

[0038] The full-ear cylindrical lithium battery positive busbar provided by the utility model is further described below through specific embodiments.

[0039] Embodiment 1:

[0040] Under the condition that a fan-shaped opening with a central angle of 10° is opened on the positive busbar body 1, the battery filling time is 794s, the internal resistance is 2.95mΩ, and the battery is subjected to 500 cycle charge and discharge tests under the conditions of 6A charging and 30A discharging. The performance of the battery maintains 90% of the original performance. The test results are summarized in Table 1.

[0041] Embodiment 2:

[0042] Under the condition that a fan-shaped opening with a central angle of 170° is opened on the positive busbar body 1, the battery filling time is 613s, the internal resistance is 3.1mΩ, and the battery is subjected to 500 cycle charge and discharge tests under the conditions of 6A charging and 30A discharging. The battery performance maintains 88% of the original performance. The test results are summarized in Table 1.

[0043] Embodiment 3:

[0044] Under the condition that two centrally symmetrical fan-shaped openings with a central angle of 10° were opened on the positive busbar body 1, the battery filling time was 781s, the internal resistance was 2.98mΩ, and the battery was subjected to 500 cycle charge and discharge tests under the conditions of 6A charging and 30A discharging. The battery performance maintained 90% of the original performance. The test results are summarized in Table 1.

[0045] Embodiment 4:

[0046] Under the condition that two centrally symmetrical fan-shaped openings with a central angle of 30° were opened on the positive busbar body 1, the battery filling time was 750s, the internal resistance was 3.05mΩ, and the battery was subjected to 500 cycle charge and discharge tests under the conditions of 6A charging and 30A discharging. The battery performance maintained 89% of the original performance. The test results are summarized in Table 1.

[0047] Example 5: Without a fan-shaped opening on the positive busbar body 1, the battery filling time is 875s, the internal resistance is 2.9mΩ, and the battery is subjected to 500 cycles of charge and discharge tests under the conditions of 6A charging and 30A discharging. The battery performance maintains 91% of the original performance. The test results are summarized in Table 1.

[0048] Comparative Example 1:

[0049] When a fan-shaped opening with a central angle of 180° was opened on the positive busbar body 1, the battery filling time was 542s, the internal resistance was 3.4mΩ, and the battery was subjected to 500 cycle charge and discharge tests under the conditions of 6A charging and 30A discharging. The battery performance maintained 79% of the original performance and the test result was unqualified.

[0050] Comparative Example 2:

[0051] Under the condition of opening two centrally symmetrical fan-shaped openings with a central angle of 40° on the positive busbar body 1, the battery filling time was 731s, the internal resistance was 3.24mΩ, and the battery was subjected to 500 cycle charge and discharge tests under the conditions of 6A charging and 30A discharging. The battery performance maintained 78% of the original performance and the test result was unqualified.

[0052] Table 1 Test results of Examples 1-5

[0053]

[0054] From the test results in Table 1, the larger the opening, the shorter the injection time, the greater the internal resistance, and the lower the cycle performance. It is known that in normal production, when the performance parameters of the battery are injection time 600s-900s, internal resistance 2.5mΩ-3.2mΩ, and cycle performance, the battery was tested for 500 cycles of charge and discharge under the conditions of 6A charging and 30A discharging. The performance of the battery maintained 87%-92% of the original performance, and the battery was judged to be qualified. Compared with Comparative Examples 1 and 2, a central angle of 10°-170° or two central symmetric central angles of 10-30° are opened on the positive busbar body 1, which can ensure that the battery performance is within the qualified range, and at the same time can effectively reduce the injection time and optimize the liquid absorption performance. The full-pole ear cylindrical lithium battery with the above-mentioned full-pole ear cylindrical battery positive busbar helps to improve the current situation of slow injection of the battery cell and improves the liquid absorption of the pole piece.

[0055] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A positive busbar for a cylindrical lithium battery with full lugs, characterized in that: The invention comprises a positive busbar body (1) and a conductive connector (2) connected to the positive busbar body (1); the positive busbar body (1) comprises a liquid injection hole (3) arranged at the center of the positive busbar body (1) and a fan-shaped opening (4) arranged concentrically with the liquid injection hole (3).

2. The positive busbar of a cylindrical lithium battery with full lugs according to claim 1, characterized in that: The fan-shaped opening (4) is provided with one, and the central angle of the fan-shaped opening (4) is 10-170°.

3. The positive busbar of a cylindrical lithium battery with full lugs according to claim 1, characterized in that: Two fan-shaped openings (4) are provided, and the central angles of the two fan-shaped openings (4) are respectively 10-30°.

4. The positive busbar of a cylindrical lithium battery with full lugs according to claim 3, characterized in that: The two fan-shaped openings (4) are arranged in a centrally symmetrical manner with respect to the center of the injection hole (3).

5. The positive busbar of a cylindrical lithium battery with full lugs according to claim 1, characterized in that: A fuse hole (5) is provided at the connection between the conductive connector (2) and the positive busbar body (1).

6. The positive busbar of a cylindrical lithium battery with full lugs according to claim 1, characterized in that: Two notches (6) are provided at the connection between the conductive connector (2) and the positive busbar body (1), and the two notches (6) are symmetrically arranged at the two side edges of the connection between the conductive connector (2) and the positive busbar body (1).

7. The positive busbar of a cylindrical lithium battery with full lugs according to claim 1, characterized in that: The conductive connector (2) and the positive electrode busbar body (1) are an integrated stamped structure.

8. A full-ear cylindrical lithium battery, characterized in that: The full-pole-lug cylindrical lithium battery has the full-pole-lug cylindrical lithium battery positive busbar as described in any one of claims 1-7.

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