Winding needle mechanism and battery cell winding machine

Abstract

The utility model discloses a winding needle mechanism, which is used for a battery core winding machine and comprises a winding needle seat, a winding needle base and a winding needle, one end of the first winding needle is connected with the winding needle seat; the second winding needle and the first winding needle are oppositely arranged in a spaced mode, the second winding needle comprises a main needle, an inner clamping needle and a plurality of springs, one end of the main needle is connected with the winding needle base, and the inner clamping needle is arranged on the main needle and can stretch out towards the first winding needle or retract away from the first winding needle; the inner clamping needle is used for being matched with the first winding needle to clamp one end of a combination of the pole piece and the diaphragm, and the spring is installed between the main needle and the inner clamping needle. In the winding needle mechanism disclosed by the utility model, the inner clamping needle is matched with the first winding needle to elastically clamp one end of the combination body of the pole piece and the diaphragm under the action of the elastic force of the spring, so that the combination body of the pole piece and the diaphragm is not easy to shift, fall off and the like in the winding process, the winding effect can be ensured, and the production quality of a battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, and particularly relates to a winding needle mechanism and a core winding machine. Background Art

[0002] As the core of lithium battery core manufacturing equipment, a core winding machine is used to wind and combine electrode plates and diaphragms to form a core.

[0003] In related technologies, a core winding machine includes a winding needle mechanism. The winding needle mechanism clamps the combination of electrode plates and diaphragms through two winding needles provided thereon, so as to rotate and wind them into a core. However, the clamping is not firm enough, and the combination of electrode plates and diaphragms is prone to displacement or even falling off during the winding process, resulting in poor winding effect and abnormal quality of the produced core. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a winding needle mechanism, aiming to solve the technical problem that the current winding needle mechanism clamps the combination of electrode plates and diaphragms not firmly enough.

[0005] To achieve the above purpose, the utility model proposes a winding needle mechanism for a core winding machine, and the winding needle mechanism includes:

[0006] A winding needle base;

[0007] A first winding needle, one end of the first winding needle is connected to the winding needle base;

[0008] A second winding needle, the second winding needle is arranged opposite to the first winding needle at an interval. The second winding needle includes a main needle, an inner clamping needle and a spring. One end of the main needle is connected to the winding needle base. The inner clamping needle is arranged on the main needle and can extend towards the first winding needle or retract away from the first winding needle. The inner clamping needle is used to cooperate with the first winding needle to clamp one end of the combination of electrode plates and diaphragms. The spring is installed between the main needle and the inner clamping needle.

[0009] In some embodiments, an installation groove is arranged on one side of the main needle facing the first winding needle. The inner clamping needle is arranged in the installation groove and extends out from the notch of the installation groove;

[0010] There are at least two springs. The at least two springs are located in the installation groove and are arranged at intervals in the length direction of the inner clamping needle. One end of each spring abuts against the bottom wall of the installation groove, and the other end abuts against the inner clamping needle.

[0011] In some embodiments, a plurality of first mounting holes are recessed in the bottom wall of the mounting groove, the inner clamping needle is provided with a plurality of second mounting holes, each of the second mounting holes is arranged in alignment with one of the first mounting holes, one end of each spring is received in one of the first mounting holes, and the other end is received in the second mounting hole that is in alignment with the first mounting hole.

[0012] In some embodiments, the second winding needle further includes two limiting members, and the two limiting members are respectively arranged at opposite ends of the mounting groove for limiting the extending distance of the inner clamping needle by blocking the inner clamping needle.

[0013] In some embodiments, the plurality of springs are divided into two spring groups, the two spring groups are symmetrically arranged about the center of the inner clamping needle, and the distance between any two adjacent springs in each spring group is equal.

[0014] In some embodiments, the second winding needle further includes a secondary needle, and the secondary needle is arranged on the side of the main needle facing away from the first winding needle and is detachably connected to the main needle.

[0015] In some embodiments, a positioning post is provided on one of the main needle and the secondary needle, and a positioning hole is provided on the other, and the positioning post is inserted into the positioning hole to realize the positioning of the connection between the main needle and the secondary needle.

[0016] In some embodiments, the thickness of the secondary needle is gradually changed from large to small in the direction away from the main needle.

[0017] In some embodiments, a convex strip is provided on the clamping surface of the end of the inner clamping needle that is used to cooperate with the first winding needle to clamp the pole piece and the diaphragm, and the convex strip extends along the length direction of the inner clamping needle.

[0018] The present invention also provides a battery core winding machine, which includes a driving mechanism and a winding needle mechanism as described above. The driving mechanism is connected to the winding needle seat and is used to drive the winding needle seat to rotate.

[0019] The winding needle mechanism of the present utility model is used for a battery core winding machine. By clamping the combination of the pole piece and the separator, it can wind them into a battery core. On the winding needle seat of the winding needle mechanism, the second winding needle and the first winding needle are arranged opposite to each other at intervals. When one end of the combination of the pole piece and the separator is placed between the second winding needle and the first winding needle, the inner clamping needle of the second winding needle cooperates with the first winding needle to clamp it, and a spring applies an elastic force towards the first winding needle to the inner clamping needle. Under the action of the elastic force of the set spring, the inner clamping needle cooperates with the first winding needle to elastically clamp one end of the combination of the pole piece and the separator. The combination of the pole piece and the separator is firmly clamped. Furthermore, during the winding process, the combination of the pole piece and the separator is not prone to displacement, falling off, etc., which can ensure the winding effect and improve the quality of the produced battery core. And, the spring is not easily aged and lose elasticity, has a long service life, does not need to be frequently maintained and replaced, saves time and effort, and can improve the comprehensive production efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic structural diagram of the winding needle mechanism in an embodiment of the present utility model;

[0021] Figure 2 FIG. is a schematic structural diagram of the second winding needle of the winding needle mechanism in an embodiment of the present utility model;

[0022] Figure 3 is Figure 2 a cross-sectional view of the second winding needle of the winding needle mechanism in the embodiment;

[0023] Figure 4 is Figure 2 an exploded view of the winding needle mechanism in the embodiment;

[0024] Description of the reference numerals in the drawings:

[0025] Label Name Label Name 100 Bobbin holder 1 First mounting hole 210 First bobbin pin 2 Second mounting hole 220 Second bobbin pin T Limit step 221 Main needle 224 Sub-needle 222 Inner clamping needle 3 Positioning post 223 Spring 4 Positioning hole 221a Mounting groove 222a Ridge

[0026] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0028] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0030] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0031] An embodiment of the present utility model provides a winding needle mechanism for a battery core winding machine. Referring to Figures 1 to 3 , the winding needle mechanism includes:

[0032] A winding needle base 100;

[0033] A first winding needle 210, one end of the first winding needle 210 is connected to the winding needle base 100;

[0034] A second winding needle 220, the second winding needle 220 is disposed opposite to the first winding needle 210 at an interval. The second winding needle 220 includes a main needle 221, an inner clamping needle 222 and a spring 223. One end of the main needle 221 is connected to the winding needle base 100. The inner clamping needle 222 is disposed on the main needle 221 and can extend towards the first winding needle 210 or retract away from the first winding needle 210. The inner clamping needle 222 is used to cooperate with the first winding needle 210 to clamp one end of the combination of the pole piece and the diaphragm. The spring 223 is installed between the main needle 221 and the inner clamping needle 222.

[0035] The winding pin mechanism involved in this embodiment is used in a battery cell winding machine. In the battery cell winding machine, the winding pin mechanism is connected to a driving mechanism. The winding pin mechanism holds one end of a combination body of a pole piece and a separator (such as a stacked combination of a positive pole piece, a separator, and a negative pole piece), and rotates under the drive of the driving mechanism, thereby winding the combination body of the pole piece and the separator to form a wound battery cell. Among them, one end of the combination body of the pole piece and the separator held by the winding pin mechanism is finally the innermost end of the formed wound battery cell, and the other end of the combination body of the pole piece and the separator is finally the outermost end of the formed wound battery cell.

[0036] The winding pin mechanism mainly includes a winding pin base 100, a first winding pin 210, and a second winding pin 220. The first winding pin 210 and the second winding pin 220 are arranged on the same side of the winding pin base 100. On the winding pin base 100, the second winding pin 220 is arranged opposite to the first winding pin 210 at an interval, and a gap is formed between the two for one end of the combination body of the pole piece and the separator to extend in. The second winding pin 220 includes a main pin 221, an inner clamping pin 222, and a spring 223. The inner clamping pin 222 is movably arranged on the side of the main pin 221 facing the first winding pin 210, and the inner clamping pin 222 can extend towards the first winding pin 210 or retract away from the first winding pin 210, so as to change the distance from the first winding pin 210, thereby realizing the clamping or loosening of one end of the combination body of the pole piece and the separator. The spring 223 applies an elastic force towards the first winding pin 210 to the inner clamping pin 222, so that the inner clamping pin 222 and the first winding pin 210 stably cooperate to clamp one end of the combination body of the pole piece and the separator.

[0037] Specifically, when winding the battery cell, one end of the combination body of the pole piece and the separator is placed between the second winding pin 220 and the first winding pin 210, and the inner clamping pin 222 of the second winding pin 220 cooperates with the first winding pin 210 to clamp it. And when the winding pin base 100 is driven to rotate, the combination body of the pole piece and the separator can be wound layer by layer around the first winding pin 210 and the second winding pin 220, thereby manufacturing a wound battery cell.

[0038] Among them, under the elastic force of the provided spring 223, the inner clamping pin 222 cooperates with the first winding pin 210 to elastically clamp one end of the combination body of the pole piece and the separator. The combination body of the pole piece and the separator is firmly clamped, and thus during the winding process, the combination body of the pole piece and the separator is not prone to displacement, falling off, etc., which can ensure the winding effect and improve the quality of the produced battery cell; moreover, the spring 223 is not easy to age and lose elasticity, has a long service life, does not need to be frequently maintained and replaced, saves time and effort, and can improve the overall production efficiency of the equipment.

[0039] In some embodiments, referring to Figure 3 and Figure 4, an installation groove 221a is provided on one side of the main needle 221 facing the first coiling needle 210, and the inner clamping needle 222 is arranged in the installation groove 221a and extends out from the notch of the installation groove 221a;

[0040] At least two springs 223 are provided. The at least two springs 223 are located in the installation groove 221a and are arranged at intervals in sequence along the length direction of the inner clamping needle 222. One end of each spring 223 abuts against the bottom wall of the installation groove 221a, and the other end abuts against the inner clamping needle 222.

[0041] In this embodiment, the main needle 221 installs the inner clamping needle 222 by providing the installation groove 221a. The installation groove 221a is adapted to the inner clamping needle 222. The inner clamping needle 222 is inserted into the installation groove 221a and can be telescoped by moving in the installation groove 221a. Among them, the opposite two side walls of the installation groove 221a are slidably matched with the two side walls of the inner clamping needle 222 respectively, so as to realize the movement guiding of the inner clamping needle 222 during the movement of the inner clamping needle 222. The spring 223 is correspondingly arranged in the installation groove 221a. The two ends of the spring 223 respectively abut against the bottom wall of the installation groove 221a and the inner clamping needle 222, that is, the spring 223 is clamped between the bottom wall of the installation groove 221a and the inner clamping needle 222. And at least two springs 223 are provided. The at least two springs 223 are arranged at intervals in sequence along the length direction of the inner clamping needle 222. The at least two springs 223 jointly provide an elastic force for the inner clamping needle 222, so that the inner clamping needle 222 has a better clamping effect when elastically clamping the combination of the pole piece and the diaphragm. Among them, the number of the springs 223 can be set to four, six or eight, etc.

[0042] In some embodiments, referring to Figure 3 , a plurality of first installation holes 1 are recessed in the bottom wall of the installation groove 221a, and a plurality of second installation holes 2 are provided on the inner clamping needle 222. Each second installation hole 2 is arranged in alignment with a first installation hole 1. One end of each spring 223 is accommodated in a first installation hole 1, and the other end is accommodated in the second installation hole 2 that is in alignment with the first installation hole 1. In this embodiment, the number of the first installation holes 1 and the second installation holes 2 is set according to the number of the springs 223. For example, when six springs 223 are provided, six first installation holes 1 are correspondingly provided on the bottom wall of the installation groove 221a, and six second installation holes 2 are correspondingly provided on the inner clamping needle 222. The six second installation holes 2 correspond to the six first installation holes 1 one by one for realizing the installation of the six springs 223. Specifically, the two ends of the spring 223 are respectively inserted into the first installation hole 1 on the bottom wall of the installation groove 221a and the second installation hole 2 on the inner clamping needle 222 to realize installation positioning, so as to be stably arranged between the main needle 221 and the inner clamping needle 222. Among them, both the first installation hole 1 and the second installation hole 2 are circular holes, and their central axes coincide and their diameters are the same, which can prevent the spring 223 from being installed obliquely.

[0043] In some embodiments, the second volume needle 220 further includes two limiting members, which are respectively disposed at opposite ends of the mounting groove 221a and are used to limit the protruding distance of the inner clamping needle 222 by blocking the inner clamping needle 222. In this embodiment, the limiting members can adopt structural forms such as limiting sheets and limiting plates, and the limiting members are detachably connected to the main needle 221. The detachable connection method can adopt screw connection and the like. As Figure 4 shown, at each of the two ends of the mounting groove 221a along its length direction, a limiting member is respectively disposed, and both limiting members extend toward the notch of the mounting groove 221a. Limiting steps T are respectively disposed at both ends of the inner clamping needle 222. The two limiting members block the inner clamping needle 222 by stopping the limiting steps T at both ends of the inner clamping needle 222, thereby limiting the protruding distance of the inner clamping needle 222. Moreover, it can also prevent the inner clamping needle 222 from disengaging from the mounting groove 221a along its protruding direction, realizing the stable setting of the inner clamping needle 222 in the mounting groove 221a.

[0044] In some embodiments, referring to Figure 3 and Figure 4 , the plurality of springs 223 are divided into two spring groups, and the two spring groups are symmetrically arranged about the center of the inner clamping needle 222, and the distance between any two adjacent springs 223 in each spring group is equal. In this embodiment, taking six springs 223 as an example, the six springs 223 are divided into two spring groups, and each spring group is composed of three springs 223. Taking the length direction of the inner clamping needle 222 as the reference direction, by symmetrically arranging the two spring groups about the center of the inner clamping needle 222, and the distance between any two adjacent springs 223 in the spring group is equal, the springs 223 are evenly arranged, and the elastic force exerted by the springs 223 on the inner clamping needle 222 is balanced. Therefore, a balanced clamping force is maintained at each position at one end of the combination of the pole piece and the diaphragm, and the clamping effect is good.

[0045] In some embodiments, referring to Figures 1 to 4, the second winding needle 220 further includes a secondary needle 224. The secondary needle 224 is disposed on the side of the main needle 221 facing away from the first winding needle 210 and is detachably connected to the main needle 221. In this embodiment, when winding the combination of the electrode sheet and the separator, the second winding needle 220 uses the provided secondary needle 224 to hold the combination of the electrode sheet and the separator. The position of the combination of the electrode sheet and the separator held by the secondary needle 224 corresponds to the corner position of the formed battery cell. Among them, the detachable connection method between the secondary needle 224 and the main needle 221 can be screw connection or the like, and there is no limitation thereto. Since the secondary needle 224 is detachable on the main needle 221, therefore, multiple secondary needles 224 with different width dimensions can be configured. When it is necessary to produce battery cells with different width dimensions, the staff can select a suitable secondary needle 224 from the multiple secondary needles 224 and install it on the main needle 221 to make it adapt to the width dimension of the battery cell to be produced.

[0046] In some embodiments, referring to Figure 4 , a positioning post 3 is provided on one of the main needle 221 and the secondary needle 224, and a positioning hole 4 is provided on the other. The positioning post 3 is inserted into the positioning hole 4 to realize the positioning of the connection between the main needle 221 and the secondary needle 224. In this embodiment, when the secondary needle 224 and the main needle 221 are butt-assembled, positioning is performed by inserting the positioning post 3 into the positioning hole 4, and then the secondary needle 224 and the main needle 221 are further connected, which helps to improve the assembly convenience and assembly efficiency. Among them, multiple positioning holes 4 and positioning posts 3 can be provided, and each positioning post 3 is correspondingly used to form a plug-in fit with a positioning hole 4.

[0047] In some embodiments, referring to Figure 2 and Figure 4 , the thickness of the secondary needle 224 is gradually changed from large to small along the direction away from the main needle 221. In this embodiment, taking the direction away from the main needle 221 as the reference direction, the thickness of the secondary needle 224 is gradually changed from large to small. One side thereof presents a narrower side, and the other side presents a wider side. The wider side of the secondary needle 224 is butt-connected to the main needle 221, and the narrower side of the secondary needle 224 is relatively far away from the main needle 221. Optionally, the cross-sectional shape of the secondary needle 224 is triangular or trapezoidal. When winding the combination of the electrode sheet and the separator, the narrower side of the secondary needle 224 holds the combination of the electrode sheet and the separator to correspondingly form the corner of the battery cell, and the winding effect is good.

[0048] In some embodiments, referring to Figure 2 and Figure 4, a clamping surface at one end of the inner clamping needle 222 for cooperating with the first winding needle 210 to clamp the combination of the pole piece and the diaphragm is provided with a rib 222a, and the rib extends along the length direction of the inner clamping needle 222. In this embodiment, when the inner clamping needle 222 and the first winding needle 210 cooperate to clamp one end of the combination of the pole piece and the diaphragm, the rib 222a provided on the clamping surface contacts the combination of the pole piece and the diaphragm, which can increase the friction force and further improve the clamping stability. Optionally, at least two ribs 222a are provided, and the at least two ribs 222a are spaced along the width direction of the inner clamping needle 222.

[0049] An embodiment of the present invention also provides a battery cell winding machine, which includes a driving mechanism and a winding needle mechanism as described in the foregoing embodiment. The driving mechanism is connected to the winding needle seat 100 and is used to drive the winding needle seat 100 to rotate. For the specific structure of the winding needle mechanism, refer to the above embodiment. Since this battery cell winding machine adopts all the technical solutions of all the above embodiments, it at least has all the technical effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one. Among them, the structural composition of the involved driving mechanism can be selected and set by itself. For example, the driving mechanism includes a driving motor and a transmission component. The driving motor is connected to the winding needle seat 100 through the transmission component, and the transmission component can adopt a gear component or the like, and there is no limitation on this.

[0050] The above are only partial or preferred embodiments of the present invention. Whether in terms of words or drawings, they cannot limit the scope of protection of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the overall concept of the present invention, or direct / indirect application in other related technical fields is included in the scope of protection of the present invention.

Claims

1. A winding needle mechanism for a battery core winding machine, characterized in that: The needle winding mechanism comprises: Needle coil holder; a first winding needle, one end of which is connected to the winding needle seat; The second winding needle is arranged opposite to the first winding needle with an interval, and the second winding needle includes a main needle, an inner clamping needle and a spring. One end of the main needle is connected to the winding needle seat, and the inner clamping needle is arranged on the main needle and can extend toward the first winding needle or retract away from the first winding needle. The inner clamping needle is used to cooperate with the first winding needle to clamp one end of the combination of the pole piece and the diaphragm, and the spring is installed between the main needle and the inner clamping needle.

2. The needle winding mechanism according to claim 1, characterized in that: A mounting groove is provided on one side of the main needle facing the first winding needle, and the inner clamping needle is arranged in the mounting groove and extends out from the notch of the mounting groove; At least two springs are provided, and the at least two springs are located in the installation groove and are arranged in sequence along the length direction of the inner clamp needle. One end of each spring abuts against the bottom wall of the installation groove, and the other end abuts against the inner clamp needle.

3. The needle winding mechanism according to claim 2, characterized in that: The bottom wall of the mounting groove is recessed with a plurality of first mounting holes, and the inner clamping needle is provided with a plurality of second mounting holes, each of the second mounting holes is arranged opposite to a first mounting hole, and one end of each of the springs is accommodated in one of the first mounting holes, and the other end is accommodated in the second mounting hole opposite to the first mounting hole.

4. The needle winding mechanism according to claim 2, characterized in that: The second winding needle further includes two limiting members, which are respectively arranged at opposite ends of the mounting groove and are used to limit the extension distance of the inner clamping needle by blocking the inner clamping needle.

5. The needle winding mechanism according to any one of claims 1 to 4, characterized in that: The plurality of springs are divided into two spring groups, the two spring groups are symmetrically arranged about the center of the inner clamping needle, and the distance between any two adjacent springs in each spring group is equal.

6. The needle winding mechanism according to any one of claims 1 to 4, characterized in that: The second winding needle further comprises a secondary needle, which is arranged on the other side of the main needle facing away from the first winding needle and is detachably connected to the main needle.

7. The needle winding mechanism according to claim 6, characterized in that: One of the main needle and the auxiliary needle is provided with a positioning column, and the other is provided with a positioning hole. The positioning column is inserted into the positioning hole to achieve the positioning of the main needle and the auxiliary needle.

8. The needle winding mechanism according to claim 6, characterized in that: The thickness of the secondary needle is gradually changed from large to small along the direction away from the main needle.

9. The needle winding mechanism according to any one of claims 1 to 4, characterized in that: A clamping surface on the inner clamping needle, which is used to cooperate with the first winding needle to clamp the pole piece and one end of the diaphragm, is provided with a convex strip, and the convex strip is extended along the length direction of the inner clamping needle.

10. A battery core winding machine, characterized in that: It comprises a driving mechanism and a needle winding mechanism as claimed in any one of claims 1 to 9, wherein the driving mechanism is connected to the needle winding seat and is used to drive the needle winding seat to rotate.

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