Roll core with electrolyte channel and battery
By creating electrolyte channels on the positive and negative electrodes of the lithium battery, the problem of uneven electrolyte wetting is solved, achieving uniform distribution and efficient transport of the electrolyte, thus improving the battery's cycle performance and lifespan.
Patent Information
- Application Number
- CN202423158604.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In existing lithium battery manufacturing technologies, as the size of the electrode increases, it becomes more difficult for the electrolyte to wet the electrode, resulting in some areas not being fully wetted, which limits the effective capacity and cycle performance of lithium-ion batteries.
Electrolyte channels are created on the positive and negative electrode plates to ensure that the electrolyte can be fully wetted, thereby improving the cycle performance and safety performance of the battery.
By designing electrolyte channels, a uniform distribution of electrolyte on the electrodes is achieved, which improves the transmission efficiency of lithium ions between the positive and negative electrodes and enhances the cycle performance and lifespan of the battery.
Smart Images
Figure CN223911676U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of battery, especially a winding core with electrolyte channel and battery. BACKGROUND
[0002] In recent years, with the change of international situation, the energy crisis faced by the world is more severe, at the same time, the trend of global warming is also increasing, these factors together promote people's demand for new energy growing. As a key component of new energy field, lithium battery technology has been unprecedented development, especially in the field of energy storage, the capacity of the battery is getting larger and larger, and the technology is significantly improved.
[0003] In the existing lithium battery manufacturing technology, the active material is usually coated on the surface of the pole piece except the pole lug position, this method can make the pole piece store and release electric energy in the process of battery charging and discharging. However, when the battery capacity is required to increase, the usual way is to make the pole piece size larger, mainly refers to set the pole piece thicker, when the pole piece becomes thicker, the deficiency of traditional manufacturing method appears, one of the significant problems is that the electrolyte on the pole piece becomes difficult to soak. The electrolyte cannot uniformly cover the entire electrode surface, resulting in that the electrolyte in some areas cannot completely soak the electrode material, thereby reducing the actual electrode surface area available for electrochemical reaction. This phenomenon not only limits the effective capacity of lithium ion battery, but also may affect the cycle performance of the battery. SUMMARY
[0004] The utility model considers the preceding problem and makes, the utility model discloses a kind of winding core with electrolyte channel and battery, by being equipped with electrolyte channel on positive pole piece and negative pole piece, Ensure that electrolyte on positive pole piece and negative pole piece can be completely soaked, to improve the cycle performance, safety performance and service life of battery.
[0005] To achieve the above object, the utility model provides a kind of winding core with electrolyte channel, including first pole piece, second pole piece and diaphragm, the diaphragm is located between the first pole piece and the second pole piece, the first pole piece is equipped with first lug, the first lug is arranged in the one end of the first pole piece along first direction;
[0006] The first pole piece is equipped with first electrolyte channel, the first electrolyte channel is arranged in the middle of the first lug along first direction, and one end of the first electrolyte channel is located on one side of the first lug.
[0007] According to the winding core with electrolyte channel described above, the first pole piece is set as positive pole piece or negative pole piece, and the first electrolyte channel penetrates both ends of the first pole piece.
[0008] The first electrolyte channel is arranged in the middle part of the positive plate along a first direction, and one end of the first electrolyte channel is located at one side of the positive lug.
[0009] The second electrolyte channel is arranged in the middle part of the negative plate along a first direction, and one end of the second electrolyte channel is located at one side of the negative lug.
[0010] The first electrolyte channel and the second electrolyte channel are symmetrically arranged on the upper and lower sides of the diaphragm.
[0011] The positive plate is made of aluminum foil, and the negative plate is made of copper foil.
[0012] The first electrolyte channel is arranged in the middle part of the negative plate along a first direction, and one end of the first electrolyte channel is located at one side of the negative lug.
[0013] A battery comprises:
[0014] The housing and the end cap are adapted to each other, and the end cap can be buckled on the housing to form a sealed accommodating cavity.
[0015] The battery core with the electrolyte channel is located in the accommodating cavity.
[0016] The battery comprises two end caps, and the two end caps are buckled on the upper and lower sides of the housing, respectively.
[0017] The battery is a lithium electronic battery.
[0018] The first electrolyte channel and the second electrolyte channel are arranged in the middle part of the positive plate and the negative plate, respectively, and electrolyte can be introduced into the first electrolyte channel and the second electrolyte channel. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 This is a schematic diagram of the positive electrode structure in Example 1;
[0020] Figure 2 This is a schematic diagram of the core installation state in Example 1;
[0021] Figure 3 yes Figure 2 Partial schematic diagram of the cross-section at point AA;
[0022] Figure 4 This is a top view of the core of Embodiment 1;
[0023] Figure 5 This is an exploded view of the battery structure in Example 1.
[0024] In the picture:
[0025] 1. Core; 11. Positive electrode plate; 111. First electrolyte channel; 112. Positive electrode tab; 12. Negative electrode plate; 121. Second electrolyte channel; 122. Negative electrode tab; 13. Separator;
[0026] 2. Shell;
[0027] 3. End caps. Detailed Implementation
[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0029] Example 1
[0030] like Figures 1-5 As shown, a battery includes a housing 2, an end cap 3, and a core 1. The end cap 3 is adapted to the housing 2 and can be fastened to the housing 2 to form a sealed receiving cavity. The core 1 is located in the receiving cavity to form a battery. Each battery includes multiple cores 1, which are stacked inside the housing 2. The core 1 has an electrolyte channel. When electrolyte is poured into the battery, the electrolyte can quickly enter the core 1 along the electrolyte channel, which accelerates the electrolyte wetting rate and improves the wettability of the electrolyte on the core 1. This results in good cycle performance, safety performance, and a long service life for the battery.
[0031] The core 1 is fixed inside the housing 2 by means of limiting parts or fixing straps to prevent it from moving freely inside the housing 2.
[0032] Two end caps 3 are provided, which are respectively fastened to the upper and lower sides of the housing 2. That is, the corresponding end caps 3 can be removed from both the upper and lower sides, increasing the opening of the housing 2 and making it easier to take the core 1 out of the housing 2.
[0033] Of course, if for the convenience of the battery, also can be placed outside the shell 2 handle or other holding part, can be directly taken by holding part battery.
[0034] A winding core with electrolyte channel, comprising a first electrode sheet, a second electrode sheet and a diaphragm 13, a plurality of groups of first electrode sheet, second electrode sheet and diaphragm 13 are wound to form a winding core 1, wherein the electrolyte channel can be opened on the first electrode sheet or the second electrode sheet or the first electrode sheet and the second electrode sheet, so that the electrolyte can quickly enter the inside of the winding core 1, thereby improving its wettability, ensuring complete immersion, and improving the conductivity of the winding core 1.
[0035] Specifically, the diaphragm 13 is located between the first electrode sheet and the second electrode sheet, a first lug is provided on the first electrode sheet, the first lug is arranged at one end of the first electrode sheet along the first direction, a first electrolyte channel 111 is provided on the first electrode sheet, the first electrolyte channel 111 is arranged at the middle of the first lug along the first direction, and one end of the first electrolyte channel 111 is located on one side of the first lug. The existence of the first electrolyte channel 111 can make the electrolyte directly enter the inside of the winding core 1, facilitate the complete immersion of the electrolyte in the winding core, and further diffuse the electrolyte to the inside of the second electrode sheet when the first electrode sheet is immersed. Compared with the conventional immersion from the outer surface, the immersion rate of the winding core can be greatly improved, and the immersion effect of the first electrode sheet and the second electrode sheet can be improved, so that the lithium ion can be effectively transmitted between the positive and negative electrodes, the conductivity can be improved, and the arrangement direction of the first electrolyte channel 111 is the same as that of the first lug, which is closer to the liquid inlet and has higher liquid inlet efficiency.
[0036] Wherein, the positive electrode sheet 11 generally refers to the electrode sheet containing the active material which is reduced during discharge and has high potential, the negative electrode sheet 12 generally refers to the electrode sheet containing the active material which is oxidized during discharge and has low potential, and the diaphragm mainly plays the role of separating the positive and negative electrodes of the battery to prevent short circuit caused by contact between the two electrodes. Because of the existence of electrolyte, the electrolyte is generally an organic solvent, and the diaphragm is required to not react or dissolve with the electrolyte, so the diaphragm is required to have good chemical stability, and at the same time, it is required to have large porosity and good electrolyte wettability and high liquid absorption rate, which is beneficial to improve the ion conductivity. Common diaphragm materials include polyethylene (PE), polypropylene (PP) and the like. These materials have good mechanical strength and chemical stability, and can meet the requirements of lithium batteries.
[0037] Specifically, the electrolyte inlet is arranged on the shell 2, and the first tabs on the first pole piece all face the side of the shell where the electrolyte inlet is arranged, so that the electrolyte inlet is close to the tabs of the first pole piece and close to the first electrolyte channel 111, and the electrolyte can quickly enter the first electrolyte channel 111 after entering from the electrolyte inlet, thereby improving the entering speed of the electrolyte and shortening the overall soaking time and improving the efficiency after quickly entering the inside of the roll core 1.
[0038] The first pole piece is a positive pole piece 11, and the first electrolyte channel 111 penetrates both ends of the first pole piece, and the electrolyte can flow in a loop through the first electrolyte channel 111 to ensure the balance of the electrolyte at both ends of the first pole piece, thereby ensuring that there is no area on the first pole piece that is difficult to soak.
[0039] In this embodiment, the electrolyte channels are arranged on both the first pole piece and the second pole piece, i.e., the electrolyte channels are arranged on both the positive pole piece 11 and the negative pole piece 12, and of course, the electrolyte channels can also be arranged only on the positive pole piece 11 or only on the negative pole piece 12. The separator 13 in between can pass lithium ions to facilitate the free transmission of lithium ions between the positive and negative electrodes.
[0040] In this embodiment, the first pole piece is a positive pole piece 11, the first tab is a positive tab 112, the first electrolyte channel 111 is arranged in the middle of the positive pole piece 11 along the first direction, and one end of the first electrolyte channel 111 is located on one side of the positive tab 112. The second pole piece is a negative pole piece 12, the negative pole piece 12 is provided with a negative tab 122 arranged along the first direction, and the negative pole piece 12 is provided with a second electrolyte channel 121 arranged in the middle of the negative pole piece 12 along the first direction and penetrating the negative pole piece 12. One end of the second electrolyte channel 121 is located on one side of the negative tab 122, and the first electrolyte channel 111 and the second electrolyte channel 121 are symmetrically arranged on the upper and lower sides of the separator 13. The first electrolyte channel 111 and the second electrolyte channel 121 can realize rapid liquid passage of both the positive pole piece 11 and the negative pole piece 12, so that they can be soaked with electrolyte at the same time, ensure that the electrolyte is completely soaked in the positive and negative electrodes, and maximize the soaking degree.
[0041] The first electrolyte channel 111 and the second electrolyte channel 121 are both semicircular or rectangular.
[0042] Specifically, the positive pole piece 11 is made of aluminum foil, and the negative pole piece 12 is made of copper foil. The positive potential of a lithium battery is high, and using aluminum foil as the positive current collector can maintain stability at high potential. Copper foil is easily oxidized at high potential, so the positive pole piece 11 is made of aluminum foil, and the negative pole piece 12 is made of copper foil.
[0043] Specifically, the battery is a lithium electron battery.
[0044] Embodiment two
[0045] In the embodiment, as described above, the first pole piece can be provided as a negative pole piece, the first tab is provided as a negative tab, the first electrolyte channel is opened in the middle of the negative pole piece along the first direction, and one end of the first electrolyte channel is located at one side of the negative tab.
[0046] The battery with the electrolyte channel disclosed in the utility model improves the wettability and wettability efficiency of the electrolyte, significantly improves the performance and reliability of the battery. This technology has wide application prospects in many fields such as electric vehicles, energy storage systems, portable electronic devices, industrial applications, medical devices, military and aerospace, backup power supplies, renewable energy systems, intelligent transportation systems and Internet of Things devices, and can meet the needs of different application scenarios for high-capacity, high-cycle performance and long-life batteries.
[0047] As in the field of electric vehicles, the power system of the electric vehicle needs a battery with high energy density and high power output. The battery of the utility model ensures the uniform distribution of electrolyte on the pole piece through the design of the electrolyte channel, improves the charge and discharge efficiency and cycle life of the battery, thereby prolonging the endurance mileage and service life of the electric vehicle. The energy recovery system (such as brake energy recovery) of the electric vehicle needs high-efficiency batteries to store and release energy. The battery of the utility model can quickly and uniformly wet the electrolyte, improve the efficiency of energy recovery, and reduce energy loss. As in the field of medical devices, such as portable electrocardiogram monitors, blood glucose meters, etc., the battery needs to work for a long time. The battery of the utility model can provide longer use time and higher safety, ensuring the normal operation of the medical device. As in the field of medical devices, such as pacemakers, insulin pumps, etc., high-reliability and long-life batteries are needed. The battery of the utility model can meet these requirements and improve the quality of life of patients.
[0048] The technical solutions of the utility model are described in detail above with reference to the drawings, and the described embodiments are used to help understand the idea of the utility model. The specific embodiments described in this paper are only examples of the spirit of the utility model. Those skilled in the art of the utility model can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.
[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, motion condition, etc. between the components in a certain posture (as shown in the drawings), if the specific posture changes, the directional indication will also change accordingly.
[0050] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.
[0051] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0052] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.
Claims
1. A core with electrolyte channels, characterized in that, The first pole piece, the second pole piece and the diaphragm, the diaphragm is located between the first pole piece and the second pole piece, the first pole piece is provided with a first lug, the first lug is arranged at one end of the first pole piece along a first direction; The first pole piece is provided with a first electrolyte channel, the first electrolyte channel is arranged at the middle of the first lug along the first direction, and one end of the first electrolyte channel is located on one side of the first lug; The first pole piece is provided with a first electrolyte channel, the first electrolyte channel is arranged at the middle of the first lug along the first direction, and one end of the first electrolyte channel is located on one side of the first lug; The second pole piece is provided with a second electrolyte channel, the second electrolyte channel is arranged at the middle of the second pole piece along the first direction, and one end of the second electrolyte channel is located on one side of the second lug.
2. The jelly-roll with electrolyte channels according to claim 1, characterized in that The first lug is provided with a first electrolyte channel, the first electrolyte channel is arranged at the middle of the first lug along the first direction, and one end of the first electrolyte channel is located on one side of the first lug.
3. The jelly-roll with electrolyte channels according to claim 1, characterized in that The first electrolyte channel and the second electrolyte channel are symmetrically arranged on the upper and lower sides of the diaphragm.
4. The jelly-roll with electrolyte channels according to claim 1, characterized in that The positive pole piece is made of aluminum foil, and the negative pole piece is made of copper foil.
5. A battery, characterized by It comprises: A housing and an end cover that are adapted to each other, the end cover can be buckled on the housing to form a sealed containing cavity; A winding core with an electrolyte channel according to any one of claims 1-4, the winding core is located in the containing cavity.
6. A battery according to claim 5, wherein The end cover is provided with two, two end covers are respectively buckled on the upper and lower sides of the housing.
7. The battery of claim 5, wherein the electrolyte is a mixture of LiPF6 and LiBF4. The battery is a lithium electronic battery.