阅读说明：本技术 一种电池卷针及大容量方形金属壳锂离子电池 (Battery winding needle and large-capacity square metal shell lithium ion battery ) 是由 佘沛亮 于 2020-12-24 设计创作，主要内容包括：本发明适用于锂离子电池技术领域,提供了一种电池卷针及大容量方形金属壳锂离子电池,电池卷针包括内管和外套管,内管设置于外套管内,内管的两端分别连通一集液管,集液管的一端开设有第一接口,外套管的两端分别连接有卡接件,卡接件套设集液管,卡接件开设有第二接口。本发明将卷绕极片的电池卷针与卷绕之后的极卷一体化,电池卷针作为电芯内壳,可以避免抽针导致的隔膜移位,消除由此引起的安全隐患；电池卷针的中空结构可以为大容量方形金属壳锂离子电池形成内部热管理通道,通过液流在电池卷针内传输,达到快速加热和冷却的效果；电池卷针为内管和外套管组合的方式,内管和外套管的液流流向相反,可以起到均温的效果。(The invention is suitable for the technical field of lithium ion batteries, and provides a battery winding needle and a high-capacity square metal shell lithium ion battery. The battery winding needle for winding the pole piece and the wound pole piece are integrated, and the battery winding needle is used as an inner shell of the battery core, so that the displacement of a diaphragm caused by needle drawing can be avoided, and potential safety hazards caused by the displacement can be eliminated; the hollow structure of the battery winding needle can form an internal heat management channel for a high-capacity square metal shell lithium ion battery, and the internal heat management channel is transmitted in the battery winding needle through liquid flow, so that the effects of rapid heating and cooling are achieved; the battery winding needle is in a mode of combining the inner tube and the outer sleeve, and the liquid flow directions of the inner tube and the outer sleeve are opposite, so that the temperature equalization effect can be achieved.)

1. The utility model provides a needle is rolled up to battery, its characterized in that, includes inner tube and outer tube, the inner tube is provided with a plurality ofly, and is a plurality of the inner tube set up side by side in the outer tube, and is a plurality of the both ends of inner tube communicate a collector tube respectively, the first interface that supplies liquid inflow or outflow is seted up to the one end of collector tube, the both ends of outer tube are connected with joint spare respectively, joint spare cover is established the collector tube, first interface extends joint spare, joint spare is seted up and is supplied the second interface that liquid inflow or outflow.

2. The battery winding needle of claim 1, wherein the outer sleeve is sized to fit the snap fit member and is welded to the snap fit member.

3. The battery winding needle of claim 1, wherein the clamping member is slightly larger than the outer sleeve and clamped with the outer sleeve, and a sealing rubber ring is arranged at the clamping position.

4. The battery winding needle of claim 1, wherein the outer sleeve is a rounded rectangular parallelepiped structure.

5. The battery winding needle of claim 1, wherein adjacent outer walls of the inner tubes are not in contact.

6. A large-capacity square metal shell lithium ion battery is characterized by comprising the battery winding needle as claimed in any one of claims 1 to 5, wherein two first interfaces in the battery winding needle are respectively communicated with an output end and a return end of external circulating water equipment, and two second interfaces are respectively communicated with the return end and the output end of the external circulating water equipment, so that liquid in the inner pipe and liquid in the outer pipe flow in opposite directions.

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a battery winding needle and a high-capacity square metal shell lithium ion battery.

Background

The capacity of the large-capacity square lithium ion battery is developed to be more than 300Ah from 100Ah and 200Ah, the problem of deformation and swelling of the battery is solved, and how to dissipate heat inside the battery is a technical difficulty which is difficult to overcome all the time, so that the large-scale application of the large-capacity square lithium ion battery is hindered, and the capacity of the square lithium ion battery is limited to be further improved. The heat inside the large-capacity square lithium ion battery cannot be effectively dissipated in the long-time charge and discharge process, the internal temperature is easily overhigh, and the diaphragm gradually shrinks to cause micro short circuit and even thermal runaway. Or the internal temperature is too high to cause a large amount of side reactions, consuming the electrolyte, and leading the capacity of the battery to be attenuated too fast. In addition, the pole piece and the diaphragm of the large-capacity square lithium ion battery are prone to dislocation when the needle is drawn after winding, so that a microcircuit and even a short circuit are caused, and potential safety hazards are caused.

Patent 'high capacity lithium ion battery' with application number 201320188337.0 adopts hollow box as the electricity core casing, but does not solve the problem of heat dissipation that produces inside the electricity core.

Patent 'a square lithium ion battery of large capacity' with application number 201210051980.9 adopts the shell body of moulding and lamination core that is equipped with the circulation metal pipeline of heat dissipation medium in the lateral wall, can strengthen the big current during operation heat dissipation of large capacity lithium ion battery and anti deformability, improves the inside different position temperature distribution's of battery cell homogeneity to a certain extent, still can't solve outside quick conduction electricity core inside heat production, or inside quick conduction heat heating electricity core.

Disclosure of Invention

The invention provides a battery winding needle and a high-capacity square metal shell lithium ion battery, and aims to solve the technical problems.

The invention is realized in such a way that a battery winding needle comprises an inner tube and an outer sleeve, wherein the inner tube is provided with a plurality of inner tubes, the inner tubes are arranged in the outer sleeve side by side, two ends of the inner tubes are respectively communicated with a liquid collecting tube, one end of the liquid collecting tube is provided with a first interface for liquid to flow in or out, two ends of the outer sleeve are respectively connected with a clamping piece, the liquid collecting tube is sleeved with the clamping piece, the first interface extends out of the clamping piece, and the clamping piece is provided with a second interface for liquid to flow in or out.

Furthermore, the outer tube with the size phase-match of joint spare, and with joint spare welding.

Furthermore, the size of joint spare slightly is greater than the outer tube, and with the outer tube joint, joint department is provided with the sealing rubber circle.

Still further, the outer sleeve is a rounded cuboid structure.

Further, adjacent outer walls of the inner tubes do not touch.

The invention also provides a large-capacity square metal shell lithium ion battery which comprises the battery winding needle, wherein two first interfaces in the battery winding needle are respectively communicated with the output end and the backflow end of external circulating water equipment, and two second interfaces are respectively communicated with the backflow end and the output end of the external circulating water equipment, so that the liquid flow directions in the inner pipe and the outer sleeve are opposite.

Advantageous effects

In the battery winding needle and the high-capacity square metal shell lithium ion battery provided by the invention, the battery winding needle for winding the pole piece is integrated with the wound pole piece, and the battery winding needle is used as an inner shell of a battery cell, so that the diaphragm displacement caused by needle drawing can be avoided, and the potential safety hazard caused by the displacement can be eliminated; the hollow structure of the battery winding needle can form an internal heat management channel for a high-capacity square metal shell lithium ion battery, and the internal heat management channel is transmitted in the battery winding needle through liquid flow, so that the effects of rapid heating and cooling are achieved; the battery winding needle is in a mode of combining the inner tube and the outer sleeve, and the liquid flow directions of the inner tube and the outer sleeve are opposite, so that the temperature equalization effect can be achieved.

Drawings

FIG. 1 is a schematic structural diagram of an inner tube and an outer sleeve of a battery winding needle provided by an embodiment of the invention;

FIG. 2 is a schematic structural diagram of an inner tube, an outer sleeve and a liquid collecting tube of the battery needle according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an outer sleeve, a liquid collecting tube and a clamping member of the battery winding needle provided by the embodiment of the invention;

fig. 4 is a schematic view of the flow of liquid in the inner tube and the outer tube of the battery needle according to the embodiment of the present invention.

The reference numbers in the figures denote: 1-inner tube, 2-outer tube, 3-liquid collecting tube, 301-first interface, 4-clamping piece, 401-second interface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 4, an embodiment of the present invention provides a battery winding pin, including: inner tube 1 and outer tube 2, inner tube 1 is provided with a plurality ofly, a plurality of inner tubes 1 set up side by side in outer tube 2, a collector tube 3 is communicate respectively at a plurality of inner tube 1's both ends, the first interface 301 that supplies liquid inflow or outflow is seted up to collector tube 3's one end, outer tube 2's both ends are connected with joint spare 4 respectively, collector tube 3 is established to 4 covers of joint spare, first interface 301 extends joint spare 4, joint spare 4 sets up the second interface 401 that supplies liquid inflow or outflow.

The liquid collecting pipe 3 is used for being communicated with external circulating water equipment, the circulating water equipment inputs low-temperature or high-temperature liquid into the liquid collecting pipe 3, the liquid flows into each inner pipe 1 through the liquid collecting pipe 3 at one end of each inner pipe 1, flows out from the other end of each inner pipe 1, is collected by the liquid collecting pipe 3 at the other end of each inner pipe 1, and finally flows back to the external circulating water equipment. In a specific embodiment of the present invention, the outer walls of the adjacent inner tubes 1 are not in contact, so that the surface area of the inner tubes 1 inside the outer sleeve 2 is maximized, which is beneficial to improving the heat exchange efficiency.

Outer tube 2 also communicates with outside circulating water equipment, and the junction of collector tube 3 and inner tube 1 is established to 4 covers of joint spare at 2 both ends of outer tube for inner tube 1 and collector tube 3 are totally by the cladding of outer tube 2, and the inside circulating water that flows of outer tube 2 can fully contact with collector tube 3 and 1 outer wall of inner tube, and outer tube 2 is split type structure with joint spare 4, the battery of being convenient for rolls up the whole equipment of needle. In one embodiment of the present invention, the outer sleeve 2 is matched with the clamping member 4 in size and welded to the clamping member 4, or in another embodiment of the present invention, the clamping member 4 is slightly larger than the outer sleeve 2 in size and clamped to the outer sleeve 2, and a sealing rubber ring is arranged at the clamping position to ensure that the outer sleeve 2 is connected with the clamping member 4 in a sealing manner.

In addition, in a specific embodiment of the present invention, the outer sleeve 2 is a rounded rectangular parallelepiped structure, which facilitates winding of the battery cell and avoids damage to the separator.

The embodiment of the invention also provides a high-capacity square metal shell lithium ion battery, which adopts the battery winding needle to wind the battery core, wherein two first interfaces 301 in the battery winding needle are respectively communicated with the output end and the backflow end of external circulating water equipment, and two second interfaces 401 are respectively communicated with the backflow end and the output end of the external circulating water equipment, so that the liquid flow directions in the inner pipe 1 and the outer sleeve 2 are opposite.

After the battery winding needle provided by the embodiment of the invention is used for winding the battery core, the battery winding needle is not taken out, but is reserved as a component of the inner cavity of the battery core, so that circulating water or other liquid is conveyed by the battery winding needle with the inner tube 1 and the outer sleeve 2 to adjust the temperature of the high-capacity square metal shell lithium ion battery.

When connecting outside circulating water equipment, the liquid flow in inner tube 1 and the outer tube 2 is opposite in addition for the inside temperature of battery book needle is even, and then reaches the purpose of evenly adjusting large capacity square metal shell lithium ion battery temperature. The circulating water equipment comprises circulating water cooling equipment and circulating water heating equipment, and is equipment for cooling or heating other equipment by circulating water in the prior art.

In summary, in the battery winding needle and the high-capacity square metal shell lithium ion battery provided by the invention, the battery winding needle for winding the pole piece and the wound pole piece are integrated, and the battery winding needle is used as the inner shell of the battery core, so that the displacement of a diaphragm caused by needle drawing can be avoided, and the potential safety hazard caused by the displacement can be eliminated; the hollow structure of the battery winding needle can form an internal heat management channel for a high-capacity square metal shell lithium ion battery, and the internal heat management channel is transmitted in the battery winding needle through liquid flow, so that the effects of rapid heating and cooling are achieved; the battery coil needle is a mode of combining the inner tube 1 and the outer sleeve 2, and the liquid flow directions of the inner tube 1 and the outer sleeve 2 are opposite, so that the temperature equalization effect can be achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.