Pole core connecting structure convenient for core combination
By introducing a bent lead into the lithium-ion battery electrode core connection structure, the problems of the fracture of the electrode and energy density are solved, higher space utilization and energy density are achieved, and the safety and assembly efficiency of the battery are improved.
Patent Information
- Application Number
- CN202421708911.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-18
AI Technical Summary
During the assembly process of existing lithium-ion battery electrode cores, the length of the electrode ears is prone to breaking, resulting in an increase in resistance. Increasing the thickness of the electrode ears to increase the strength will reduce the energy density, occupy part of the space, and reduce space utilization.
By introducing a positive electrode lead plate and a negative electrode lead plate into the core connection structure, including the first and second bent parts, respectively, the bent connection is performed, the ear length is reduced, the core efficiency is improved, and the core group is fixed by welding to prevent misalignment.
It reduces the risk of the extreme ear breakage, improves the space utilization and energy density of the extreme core, enhances the safety and production pass rate of the battery, and improves the battery assembly efficiency.
Smart Images
Figure CN222826577U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a pole core connection structure which is convenient for core assembling. Background Art
[0002] At present, the electrode core assembly process of lithium-ion batteries is as follows: continuous pole ears with different spacings are cut on the pole core, and then wound into a core package, the pole ears of two core packages are bent respectively, so that the side surfaces without pole ears of the two core packages are fitted together, and finally assembled into a shell.
[0003] The existing core-to-shell method has the following problems:
[0004] 1) The required tabs are relatively long. When the soft tabs of the dual-core package fall or vibrate, the dual-core package will collide with each other, which may cause the tabs to break. The resistance of the battery with broken tabs increases, resulting in insufficient charging and discharging of the lithium-ion battery.
[0005] 2) It is usually necessary to increase the thickness and width of the soft pole ear to improve the strength of the soft pole ear. Increasing the thickness of the soft pole ear will lead to a decrease in the energy density of the battery cell;
[0006] 3) The required pole ear is longer, and the longer pole ear will occupy part of the upper space of the pole core, where the upper space is the space between the top cover and the top of the battery cell, reducing the space utilization and energy density of the pole core. Utility Model Content
[0007] In view of this, in order to solve the technical problems existing in the prior art, the utility model provides a pole core connection structure which is bent by the first positive bending portion and the second positive bending portion of the positive lead and the first negative bending portion and the second negative bending portion of the negative lead to facilitate the closure of the first pole core and the second pole core and improve the efficiency of closure of the pole cores, while also reducing the required pole ear length, reducing the risk of pole ear breakage, and improving the space utilization and energy density of the pole core.
[0008] The utility model solves the above technical problems through the following technical solutions:
[0009] A pole core connection structure that is convenient for core closure, the pole core connection structure comprising a first pole core, a second pole core, a positive lead, and a negative lead, the positive lead and the negative lead are both located between the first pole core and the second pole core, the positive lead is located on one side of the negative lead, one end of the positive lead is connected to the positive pole ear of the first pole core, the other end of the positive lead is connected to the positive pole ear of the second pole core, one end of the negative lead is connected to the negative pole ear of the first pole core, the other end of the negative lead is connected to the negative pole ear of the second pole core, the positive lead comprises a first positive bending portion and a second positive bending portion, the first positive bending portion and the second positive bending portion are symmetrically distributed on the positive lead, the negative lead comprises a first negative bending portion and a second negative bending portion, the first negative bending portion and the second negative bending portion are symmetrically distributed on the negative lead.
[0010] Furthermore, the first pole core includes a first positive pole tab and a first negative pole tab, the first positive pole tab is fixedly connected to the positive lead-in end of the first pole core, the first negative pole tab is fixedly connected to the negative lead-in end of the first pole core, and the first positive pole tab and the first negative pole tab are both located on the same side of the first pole core.
[0011] Furthermore, the second pole core includes a second positive pole tab and a second negative pole tab, the second positive pole tab is fixedly connected to the positive lead-out end of the second pole core, the second negative pole tab is fixedly connected to the negative lead-out end of the second pole core, and the second positive pole tab and the second negative pole tab are both located on the same side of the second pole core.
[0012] Further, the positive lead includes a positive connecting piece body, a first positive ear connecting portion, and a second positive ear connecting portion, one end of the first positive bent portion is connected to one end of the positive connecting piece body, one end of the second positive bent portion is connected to the other end of the positive connecting piece body, the other end of the first positive bent portion is connected to the first positive ear connecting portion, and the other end of the second positive bent portion is connected to the second positive ear connecting portion, and the positive connecting piece body, the first positive ear connecting portion and the second positive ear connecting portion are connected through the first positive bent portion and the second positive bent portion to form an integrated structure.
[0013] Furthermore, the positive electrode connecting piece body of the positive electrode lead is formed with a positive electrode column connecting portion.
[0014] Furthermore, the negative electrode lead includes a negative electrode connecting piece body, a first negative electrode ear connecting portion, and a second negative electrode ear connecting portion, one end of the first negative electrode bending portion is connected to one end of the negative electrode connecting piece body, one end of the second negative electrode bending portion is connected to the other end of the negative electrode connecting piece body, the other end of the first negative electrode bending portion is connected to the first negative electrode ear connecting portion, and the other end of the second negative electrode bending portion is connected to the second negative electrode ear connecting portion, and the negative electrode connecting piece body, the first negative electrode ear connecting portion and the second negative electrode ear connecting portion are connected to form an integrated structure through the first negative electrode bending portion and the second negative electrode bending portion.
[0015] Furthermore, the negative electrode connecting piece body of the negative electrode lead is formed with a negative electrode column connecting portion.
[0016] Compared with the prior art, the technical solution of the utility model has at least the following beneficial effects:
[0017] The pole core connection structure of the utility model comprises a first pole core, a second pole core, a positive lead and a negative lead, wherein the positive lead and the negative lead are both located between the first pole core and the second pole core, the positive lead is located on one side of the negative lead, one end of the positive lead is connected to the positive pole ear of the first pole core, the other end of the positive lead is connected to the positive pole ear of the second pole core, one end of the negative lead is connected to the negative pole ear of the first pole core, the other end of the negative lead is connected to the negative pole ear of the second pole core, the positive lead comprises a first positive bending portion and a second positive bending portion, and the negative lead comprises a first negative bending portion and a second negative bending portion. The utility model bends the first positive bending portion and the second positive bending portion of the positive lead and the first negative bending portion and the second negative bending portion of the negative lead, so as to facilitate the assembling of the first pole core and the second pole core, thereby improving the assembling efficiency of the pole cores. The first pole core and the second pole core are connected and fixed together through the positive lead and the negative lead, so that the pole core group after the assembling is not easy to be misplaced during the process of assembling the pole core group into the battery shell, thereby improving the battery assembly efficiency.
[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of the pole core connection structure of the utility model;
[0020] Figure 2 It is a schematic diagram of the connection relationship between the positive electrode lead and the first positive electrode tab of the first pole core and the second positive electrode tab of the second pole core of the utility model;
[0021] Figure 3It is a schematic diagram of the connection relationship between the negative electrode lead of the utility model and the first negative electrode tab of the first electrode core and the second negative electrode tab of the second electrode core;
[0022] Figure 4 It is a structural schematic diagram of the positive electrode lead of the utility model;
[0023] Figure 5 It is a structural schematic diagram of the negative electrode lead of the utility model.
[0024] In the figure: a first electrode core 1, a first positive electrode tab 11, a first negative electrode tab 12, a second electrode core 2, a second positive electrode tab 21, a second negative electrode tab 22, a positive lead 3, a first positive bending portion 31, a second positive bending portion 32, a positive connecting piece body 33, a first positive electrode tab connection portion 34, a second positive electrode tab connection portion 35, a positive electrode column connection portion 36, a negative lead 4, a first negative electrode bending portion 41, a second negative electrode bending portion 42, a negative electrode connecting piece body 43, a first negative electrode tab connection portion 44, a second negative electrode tab connection portion 45, and a negative electrode column connection portion 46. DETAILED DESCRIPTION
[0025] The present invention is described in detail below in conjunction with the accompanying drawings, which are part of this specification and illustrate the principle of the present invention through embodiments. Other aspects, features and advantages of the present invention will become clear through the detailed description. In the drawings referred to, the same or similar parts in different figures are represented by the same reference numerals.
[0026] like Figure 1-5As shown, the first embodiment of the utility model provides a pole core connection structure that is convenient for core closure, the pole core connection structure includes a first pole core 1, a second pole core 2, a positive electrode lead 3, and a negative electrode lead 4. The positive electrode lead 3 and the negative electrode lead 4 are both located between the first pole core 1 and the second pole core 2. The positive electrode lead 3 is located on one side of the negative electrode lead 4. One end of the positive electrode lead 3 is connected to the positive pole ear of the first pole core 1, and the other end of the positive electrode lead 3 is connected to the positive pole ear of the second pole core 2. One end of the negative electrode lead 4 is connected to the negative pole ear of the first pole core 1, and the other end of the negative electrode lead 4 is connected to the negative pole ear of the second pole core 2. The positive electrode lead 3 includes a first positive bending portion 31 and a second positive bending portion 32. The first positive bending portion 31 and the second positive bending portion 32 are symmetrically distributed on the positive electrode lead 3. The negative electrode lead 4 includes a first positive bending portion 31 and a second positive bending portion 32. The first negative electrode bending portion 41 and the second negative electrode bending portion 42 are symmetrically distributed on the negative electrode lead 4, and are bent by the first positive electrode bending portion 31 and the second positive electrode bending portion 32 of the positive electrode lead 3 and the first negative electrode bending portion 41 and the second negative electrode bending portion 42 of the negative electrode lead 4, so as to facilitate the first pole core 1 and the second pole core 2 to be combined, thereby improving the energy density of the battery pole core, increasing the current carrying capacity of the pole core, reducing the length of the pole ear, improving the space utilization rate and energy density of the pole core, and improving the safety of the battery and the production qualification rate. The first pole core 1 and the second pole core 2 are combined and connected and fixed by the positive lead 3 and the negative lead 4, so that the pole core group after the core combination is not easy to be misplaced during the process of being assembled into the battery shell, thereby improving the battery assembly efficiency.
[0027] The first pole core 1 of the utility model includes a first positive pole tab 11 and a first negative pole tab 12, the first positive pole tab 11 is fixedly connected to the positive lead-in terminal of the first pole core 1, the first negative pole tab 12 is fixedly connected to the negative lead-in terminal of the first pole core 1, and the first positive pole tab 11 and the first negative pole tab 12 are both located on the same side of the first pole core 1, and the second pole core 2 includes a second positive pole tab 21 and a second negative pole tab 22, the second positive pole tab 21 is fixedly connected to the positive lead-in terminal of the second pole core 2, the second negative pole tab 22 is fixedly connected to the negative lead-in terminal of the second pole core 2, and the second positive pole tab 21 and the second negative pole tab 22 are both located on the same side of the second pole core 2.
[0028] In specific implementation, the thickness of the first electrode core 1 and the second electrode core 2 can be selected to be 10-100 mm, the width of the first positive electrode tab 11, the second positive electrode tab 21 and the first negative electrode tab 12, the second negative electrode tab 22 can be selected to be 10-50 mm, the thickness of the first positive electrode tab 11, the second positive electrode tab 21 and the first negative electrode tab 12, the second negative electrode tab 22 can be selected to be 0.1-0.4 mm, the first positive electrode tab 11 and the second positive electrode tab 21 are made of aluminum or aluminum alloy strips, and the first negative electrode tab 12 and the second negative electrode tab 22 are made of copper, tantalum, copper alloy or silver alloy strips.
[0029] In specific implementation, the positive lead 3 of the utility model includes a positive connecting piece body 33, a first positive ear connecting portion 34, and a second positive ear connecting portion 35. One end of the first positive bending portion 31 is connected to one end of the positive connecting piece body 33, one end of the second positive bending portion 32 is connected to the other end of the positive connecting piece body 33, the other end of the first positive bending portion 31 is connected to the first positive ear connecting portion 34, and the other end of the second positive bending portion 32 is connected to the second positive ear connecting portion 35. The positive connecting piece body 33, the first positive ear connecting portion 34 and the second positive ear connecting portion 35 are connected through the first positive bending portion 31 and the second positive bending portion 32 to form an integrated structure. The positive lead 3 is connected to the first positive electrode ear 11 of the first electrode core 1 through the first positive electrode ear connecting portion 34, and the positive lead 3 is connected to the second positive electrode ear 21 of the second electrode core 2 through the second positive electrode ear connecting portion 35. A positive electrode column connecting portion 36 is formed on the positive electrode connecting piece body 33 of the positive lead 3, and the positive electrode lead 3 can be welded to the positive electrode column of the battery top cover through the positive electrode column connecting portion 36.
[0030] In specific implementation, the negative electrode lead 4 of the utility model includes a negative electrode connecting piece body 43, a first negative electrode ear connecting portion 44, and a second negative electrode ear connecting portion 45. One end of the first negative electrode bending portion 41 is connected to one end of the negative electrode connecting piece body 43, one end of the second negative electrode bending portion 42 is connected to the other end of the negative electrode connecting piece body 43, the other end of the first negative electrode bending portion 41 is connected to the first negative electrode ear connecting portion 44, and the other end of the second negative electrode bending portion 42 is connected to the second negative electrode ear connecting portion 45. The negative electrode connecting piece body 43, the first negative electrode ear connecting portion 44 and the second negative electrode ear connecting portion 45 are connected through the first negative electrode bending portion 41 and the second negative electrode bending portion 42 to form an integrated structure. The negative electrode lead 4 is connected to the first negative electrode tab 12 of the first electrode core 1 through the first negative electrode tab connection portion 44, and is connected to the second negative electrode tab 22 of the second electrode core 2 through the second negative electrode tab connection portion 45. A negative electrode post connection portion 46 is formed on the negative electrode connection sheet body 43 of the negative electrode lead 4. The negative electrode lead 4 can be welded to the negative electrode post of the battery top cover through the negative electrode post connection portion 46.
[0031] In specific implementation, the positive lead 3 and the negative lead 4 of the utility model are connected to the first positive electrode tab 11 of the first pole core 1, the second positive electrode tab 21 of the second pole core 2, the first negative electrode tab 12 of the first pole core 1, and the second negative electrode tab 22 of the second pole core 2 by welding.
[0032] In the specific implementation of this embodiment, the first positive electrode ear connection part 34 and the second positive electrode ear connection part 35 of the positive electrode lead 3 are made of aluminum or aluminum alloy, so that the positive electrode lead 3 can be welded together with the positive electrode ear, and the thickness of the positive electrode lead 3 can be 0.5mm-3mm, and the first negative electrode ear connection part 44 and the second negative electrode ear connection part 45 of the negative electrode lead 4 are made of copper or copper alloy, so that the positive electrode lead 3 can be welded together with the negative electrode ear, and the thickness of the negative electrode lead 4 can be 0.5mm-3mm.
[0033] Embodiment 2 of the present invention provides a pole core connection structure that is convenient for core assembling. The structure of the pole core connection structure is basically the same as that of embodiment 1. For the convenience of description and saving space, only the contents different from embodiment 1 will be described below.
[0034] A plurality of pole ears are arranged on the first pole core 1 and the second pole core 2, a plurality of lead sheets are arranged between the first pole core 1 and the second pole core 2, and a plurality of pole ear connecting parts are arranged on each lead sheet. Under the premise of not changing the traditional cover plate structure, the arrangement and connection of the pole core multiple pole ears can be realized, and the plurality of pole ears are evenly distributed on the pole core output ear side, which can make the current density distribution inside the pole core more uniform, thereby making the current heat generation inside the pole core uniform, avoiding the failure of the active material caused by local overheating of the pole core during the cycle due to heat concentration, thereby effectively improving the cycle performance of the pole core. At the same time, due to the uniform distribution of current density, the risk of polarization of the pole core during large current charging and discharging can be effectively reduced, thereby effectively improving the rate performance of the pole core, which is suitable for large-capacity pole core battery structure and can perform fast charging and discharging of current.
[0035] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.
Claims
1. A pole core connection structure that is convenient for core assembling, characterized in that: The electrode core connection structure includes a first electrode core, a second electrode core, a positive electrode lead, and a negative electrode lead, wherein the positive electrode lead and the negative electrode lead are both located between the first electrode core and the second electrode core, the positive electrode lead is located on one side of the negative electrode lead, one end of the positive electrode lead is connected to the positive electrode ear of the first electrode core, and the other end of the positive electrode lead is connected to the positive electrode ear of the second electrode core, one end of the negative electrode lead is connected to the negative electrode ear of the first electrode core, and the other end of the negative electrode lead is connected to the negative electrode ear of the second electrode core, the positive electrode lead includes a first positive bending portion and a second positive bending portion, and the first positive bending portion and the second positive bending portion are symmetrically distributed on the positive electrode lead, and the negative electrode lead includes a first negative bending portion and a second negative bending portion, and the first negative bending portion and the second negative bending portion are symmetrically distributed on the negative electrode lead.
2. The pole core connection structure for facilitating core closing according to claim 1, characterized in that: The first pole core includes a first positive pole tab and a first negative pole tab, the first positive pole tab is fixedly connected to the positive lead-out end of the first pole core, the first negative pole tab is fixedly connected to the negative lead-out end of the first pole core, and the first positive pole tab and the first negative pole tab are both located on the same side of the first pole core.
3. The pole core connection structure for facilitating core closing according to claim 1, characterized in that: The second pole core includes a second positive pole tab and a second negative pole tab, the second positive pole tab is fixedly connected to the positive lead-out end of the second pole core, the second negative pole tab is fixedly connected to the negative lead-out end of the second pole core, and the second positive pole tab and the second negative pole tab are both located on the same side of the second pole core.
4. The pole core connection structure for facilitating core closing according to claim 1, characterized in that: The positive electrode lead includes a positive electrode connecting sheet body, a first positive electrode ear connecting portion, and a second positive electrode ear connecting portion. One end of the first positive electrode bent portion is connected to one end of the positive electrode connecting sheet body, one end of the second positive electrode bent portion is connected to the other end of the positive electrode connecting sheet body, the other end of the first positive electrode bent portion is connected to the first positive electrode ear connecting portion, and the other end of the second positive electrode bent portion is connected to the second positive electrode ear connecting portion. The positive electrode connecting sheet body, the first positive electrode ear connecting portion, and the second positive electrode ear connecting portion are connected to form an integrated structure through the first positive electrode bent portion and the second positive electrode bent portion.
5. The pole core connection structure for facilitating core closing according to claim 4, characterized in that: The positive electrode connecting piece body of the positive electrode lead is formed with a positive electrode column connecting portion.
6. The pole core connection structure for facilitating core closing according to claim 1, characterized in that: The negative electrode lead includes a negative electrode connecting piece body, a first negative electrode ear connecting portion, and a second negative electrode ear connecting portion, wherein one end of the first negative electrode bent portion is connected to one end of the negative electrode connecting piece body, one end of the second negative electrode bent portion is connected to the other end of the negative electrode connecting piece body, the other end of the first negative electrode bent portion is connected to the first negative electrode ear connecting portion, and the other end of the second negative electrode bent portion is connected to the second negative electrode ear connecting portion, and the negative electrode connecting piece body, the first negative electrode ear connecting portion and the second negative electrode ear connecting portion are connected to form an integrated structure through the first negative electrode bent portion and the second negative electrode bent portion.
7. The pole core connection structure for facilitating core closing according to claim 6, characterized in that: The negative electrode connecting piece body of the negative electrode lead is formed with a negative electrode column connecting portion.