Device for connecting internal and external circuits of lithium battery

Abstract

The utility model relates to a lithium battery internal and external circuit communication device, which is mounted in a lithium battery top cover and connected with an internal lead of a lithium battery, and comprises a bolt-shaped device main body, a plurality of fine copper columns and filler formed by injection molding, the device main body is fixedly mounted in the lithium battery top cover, and the fine copper columns are fixedly mounted in the device main body. A plurality of thin copper column mounting holes are formed in the device main body corresponding to the bolt head, a cavity is formed in the device main body corresponding to the screw, the main body of the thin copper column is positioned in the cavity of the device main body, one end of the thin copper column is fixed in the thin copper column mounting hole, and the other end of the thin copper column is connected with an internal lead of the lithium battery; the filler is filled in the cavity of the device main body around the thin copper columns, the filler is provided with a plurality of fixing through holes, and the thin copper columns are located in the fixing through holes. According to the utility model, the internal circuit of the lithium battery can be led out safely and conveniently while the sealing performance of the lithium battery is ensured, so that the internal and external circuits of the lithium battery are communicated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery technical field, especially relate to a lithium battery internal and external circuit intercommunication device. BACKGROUND

[0002] With the continuous development of new energy field, people have not been satisfied with the battery management ability of present BMS (battery management system), and higher requirements have been put forward for the data monitoring range and detection accuracy of BMS, and the present BMS is gradually expanding the battery management range to the internal lithium battery, but there are still certain difficulties at present.

[0003] Because the lithium battery will heat in the charging and discharging process, the overall temperature of the battery rises, and the BMS needs to monitor such temperature changes, but the method used in the market at present is mostly to fix the OT terminal (circular cold pressure terminal), water droplet head and other wire harness type NTC (negative temperature coefficient thermistor) at the lithium battery shell, monitor the resistance value change of NTC (negative temperature coefficient thermistor), and calculate the temperature change of lithium battery according to the RT table (resistance-temperature relationship corresponding table). This kind of temperature monitoring method has certain error, because the temperature is transmitted from the lithium battery cell, and part of the heat is consumed on the lithium battery aluminum shell, since the OT terminal (circular cold pressure terminal), water droplet head are all wrapped with NTC (negative temperature coefficient thermistor), so the temperature conduction to NTC (negative temperature coefficient thermistor) still needs to pass through a layer of epoxy resin, and there will be certain deviation between the temperature reaching NTC (negative temperature coefficient thermistor) after layer-by-layer reduction and the actual temperature of the internal cell of lithium battery, and the detection accuracy needs to be improved. On the other hand, the temperature needs to be transmitted to NTC (negative temperature coefficient thermistor) through various media, and also needs to pass through the material such as epoxy resin which has relatively weak heat conduction capacity, which leads to slow overall thermal response time. Therefore, it is tried to add temperature sensor in the internal lithium battery, improve the detection accuracy, and also speed up the thermal response time, so that the obtained data is more accurate and reliable.

[0004] In addition, a pressure sensor can also be added in the internal lithium battery to detect the pressure generated by the cell expansion during the charging and discharging of the lithium battery, predict the extrusion state of the internal cell of the battery through data, and deduce the battery bulging situation. Therefore, it is tried to add temperature, pressure sensor and other detection devices in the internal lithium battery, which can better monitor the internal cell temperature of the lithium battery and the pressure generated by the cell expansion during the charging and discharging, but how the data of the temperature, pressure sensor and other detection devices in the internal lithium battery is transmitted, how the external equipment receives the data transmitted by the internal lithium battery, and how to realize the intercommunication of the internal and external circuits of the lithium battery become a difficult problem to be solved. UTILITY MODEL CONTENTS

[0005] The utility model wants to solve the technical problem to provide a lithium battery internal and external circuit intercommunication device, can guarantee the lithium battery sealing simultaneously, safely and conveniently lead out the internal circuit of lithium battery, make lithium battery internal and external circuit intercommunication.

[0006] The utility model provides a kind of lithium battery internal and external circuit intercommunication device, install in lithium battery top cover, and with lithium battery internal lead connection, it includes the device main body of bolt, several thin copper columns and the filler by injection molding, the device main body is fixedly installed in lithium battery top cover, the position of the device main body corresponding bolt head is equipped with several thin copper column mounting hole, the position of corresponding screw rod is equipped with cavity, the main part of the thin copper column is located in device main body cavity, one end of the thin copper column is fixed in thin copper column mounting hole, and the other end is connected with lithium battery internal lead, the filler is filled in the device main body cavity around thin copper column, the filler is equipped with several fixed through holes, and the thin copper column is located in fixed through hole.

[0007] Preferably, the device main body corresponding bolt head position is equipped with thin copper column fixed groove, and the thin copper column mounting hole is located in the thin copper column fixed groove.

[0008] Preferably, the device main body is equipped with device main body inner thread, and the outer surface of the thin copper column is equipped with thin copper column outer thread;The filler is filled in the device main body cavity around thin copper column and is in full contact with device main body and thin copper column, and the contact surface thereof with device main body has outer thread matched with device main body inner thread, and the contact surface thereof with thin copper column has inner thread matched with thin copper column outer thread.

[0009] Preferably, the device main body length is greater than the thickness of lithium battery top cover, and the device main body corresponding bolt head part is welded in lithium battery top cover, and the top surface of device main body is flush with the top surface of lithium battery top cover.

[0010] Preferably, the device main body, filler and several thin copper columns are coated with a layer of high-barrier co-extrusion film on the part of outer surface in lithium battery.

[0011] Preferably, the thin copper column is equipped with 6. The number of thin copper columns can be set as required.

[0012] Preferably, it further comprises a thimble connector, the thimble connector comprises a connector top cover and a plurality of connector thimbles, the connector thimbles are top-mounted in the connector top cover; the connector thimbles are internally provided with springs and connector thimble heads, one end of the springs is fixed in the connector thimbles, the other end is fixedly connected with the connector thimble heads, and the connector thimble heads are connected with the fine copper columns.

[0013] Preferably, the thimble connector further comprises a plurality of connector components, and the connector components are mounted in the connector top cover.

[0014] The utility model has the following technical effects:

[0015] 1. The device body is fixedly installed on the lithium battery top cover, which ensures the sealing of the lithium battery. The assembly structure of the fine copper column mounting hole, the fixing through hole and the plurality of fine copper columns makes the fine copper column more stable. The structure that the bottom of the fine copper column is connected with the internal lead of the lithium battery can safely and conveniently lead out the internal circuit of the lithium battery, and the internal and external circuits of the lithium battery are connected.

[0016] 2. The fine copper column outer thread on the outer surface of the fine copper column cooperates with the inner thread of the filler, increases the contact area between the fine copper column and the filler, makes the lithium battery internal liquid more difficult to penetrate into the gap between the fine copper column and the filler, and makes the overall structure of the fine copper column and the filler more compact and not easy to separate to cause the gap, so that the overall air tightness is better.

[0017] 3. The internal thread of the device body cooperates with the external thread of the filler, which enhances the overall air tightness and stability.

[0018] 4. The part of the device body, the filler and the plurality of fine copper columns located in the lithium battery is coated with a layer of high-barrier co-extruded film, which prevents the device from being corroded by the lithium battery electrolyte. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a part structure schematic view of the utility model omitting injection molding;

[0020] Figure 2 It is a bolt structure schematic view of the utility model;

[0021] Figure 3 It is a thimble connector assembly structure schematic view of the utility model;

[0022] Figure 4 It is a thimble connector assembly sectional view schematic view of the utility model;

[0023] Figure 5The utility model discloses a needle type connector assembly (omitted injection part) cross section schematic view.

[0024] Figure 6 The utility model discloses a fine copper column and lithium battery internal lead connection structure schematic view.

[0025] Figure 7 The utility model discloses a needle type connector structure schematic view.

[0026] Figure 8 The utility model discloses a connector needle structure schematic view.

[0027] Figure 9 The utility model discloses a connector needle cross section structure schematic view.

[0028] Figure 10 The utility model discloses a connector needle explosion structure schematic view.

[0029] Figure 11 The utility model discloses a lithium battery structure schematic view.

[0030] Figure 12 The utility model discloses a lithium battery overhead structure schematic view.

[0031] Figure 13 The utility model discloses Figure 12 The utility model discloses a section A-A schematic view.

[0032] Figure 14 The utility model discloses a lithium battery internal lead connection cross section structure schematic view.

[0033] In the drawing: 1, battery positive pole column;2, battery negative pole column;3, safety valve;4, device main part;5, fine copper column;6, fine copper column fixed recess;7, battery top cover;8, lithium battery aluminum shell;9, filling;10, fine copper column mounting hole;11, lithium battery internal lead;12, lithium battery electric core;13, cavity;14, connector top cover;15, connector component;16, connector needle;17, spring;18, connector needle head;19, device main part internal thread;20, fine copper column external thread;21, external thread;22, internal thread. Specific implementation

[0034] In order to make the utility model's purpose, technical scheme and advantage more clear, the following is specifically described to the utility model with the attached drawing.

[0035] For example Figure 1 And Figure 2As shown, a lithium battery internal and external circuit connection device is installed in the top cover 7 of the lithium battery and connected to the internal leads 11 of the lithium battery. It includes a bolt-shaped device body 4, several thin copper pillars 5, and filler 9. The device body 4 is fixedly installed in the top cover 7 of the lithium battery. The device body 4 has several thin copper pillar mounting holes 10 corresponding to the bolt heads, and cavities 13 corresponding to the screw positions. The main body of each thin copper pillar 5 is located within the cavity 13 of the device body 4. Figure 6 As shown, one end of the thin copper pillar 5 is fixed in the thin copper pillar mounting hole 10, and the other end is connected to the internal lead 11 of the lithium battery. The filler 9 fills the cavity 13 of the device body 4 around the thin copper pillar 5. The filler 9 has several fixing through holes, and the thin copper pillar 5 is located in the fixing through holes. The structure of the device body 4 being fixedly installed on the top cover 7 of the lithium battery ensures the sealing of the lithium battery. The assembly structure of the thin copper pillar mounting hole 10, the fixing through holes and the several thin copper pillars 5 makes the installation of the thin copper pillar 5 more stable. The structure of the bottom of the thin copper pillar 5 being connected to the internal lead 11 of the lithium battery allows the internal circuit of the lithium battery to be safely and conveniently led out, so that the internal and external circuits of the lithium battery are connected. The filler 9 is usually made of plastic.

[0036] The main body 4 of the device is provided with a fine copper column fixing groove 6 at the position corresponding to the bolt head, and the fine copper column mounting hole 10 is located in the fine copper column fixing groove 6.

[0037] like Figure 1 and Figure 14 As shown, the main body 4 of the device is provided with an internal thread 19, and the outer surface of each fine copper pillar 5 is provided with an external thread 20. The filler 9 fills the cavity 13 of the main body 4 around the fine copper pillars 5 and is in full contact with the main body 4 and the fine copper pillars 5. The contact surface with the main body 4 has an external thread 21 that matches the internal thread 19 of the main body, and the contact surface with the fine copper pillars 5 has an internal thread 22 that matches the external thread 20 of the fine copper pillars. By the cooperation of the external thread 20 of the fine copper pillars 5 with the internal thread 22 of the filler 9, the contact area between the fine copper pillars 5 and the filler 9 is increased, making it more difficult for the liquid inside the lithium battery to penetrate into the gap between the fine copper pillars 5 and the filler 9. This also makes the overall structure of the fine copper pillars 5 and the filler 9 more compact, less prone to separation and gaps, and improves the overall airtightness. The cooperation of the internal thread 19 of the main body and the external thread 21 of the filler 9 enhances the overall airtightness and stability.

[0038] The length of the main body 4 is greater than the thickness of the lithium battery top cover 7. The portion of the main body 4 corresponding to the bolt head is welded into the lithium battery top cover 7, and the top surface of the main body 4 is flush with the top surface of the lithium battery top cover 7. Welding the main body 4 to the lithium battery top cover 7 with the bolt head achieves both fixation and sealing. The flush top surface of the main body 4 with the top surface of the lithium battery top cover 7 effectively prevents impacts and is also more aesthetically pleasing.

[0039] The device body 4, the filler 9 and the plurality of fine copper columns 5 are coated with a high-barrier co-extrusion film on the outer surface of the part located in the lithium battery. The structure of the device body 4, the filler 9 and the plurality of fine copper columns 5 being coated with a high-barrier co-extrusion film on the outer surface of the part located in the lithium battery prevents the device from being corroded by the electrolyte of the lithium battery.

[0040] The fine copper column 5 is provided with 6. The number of fine copper columns 5 can be set as needed.

[0041] As shown in Figures 8 to 10 , it further includes a thimble connector, which includes a connector top cover 14 and a plurality of connector thimbles 16, the top of which is installed in the connector top cover 14; the inside of the connector thimble 16 is provided with a spring 17 and a connector thimble head 18, one end of the spring 17 is fixed in the connector thimble 16, and the other end is fixedly connected with the connector thimble head 18, as shown in Figures 3 to 5 , the connector thimble head 18 is connected with the fine copper column 5. The thimble connector realizes the connection of the internal and external circuits of the lithium battery. The lithium battery outside can be connected by the thimble connector or directly welded with a lead wire.

[0042] As shown in Figure 7 , the thimble connector further includes a plurality of connector components 15, which are installed in the connector top cover 14.

[0043] As shown in Figures 11 to 13 , the lithium battery includes a battery top cover 7, a lithium battery aluminum shell 8, an internal electrolyte and a lithium battery internal lead wire 11, the battery top cover 7 is provided with a battery positive column 1, a battery negative column 2, a safety valve 3 and a lithium battery internal and external circuit communication device, and the lithium battery internal and external circuit communication device is connected with the lithium battery internal lead wire 11.

[0044] A manufacturing method of a lithium battery internal and external circuit communication device is as follows:

[0045] First take a larger bolt (no external thread), the bolt rod part hollowed out ready-made cavity 13, the cavity 13 top slot forming thin copper column fixed groove 6 (used to fix thin copper column 5), thin copper column fixed groove 6 set 6 thin copper column mounting hole 10, forming bolt-like device main body 4. Subsequently in the cavity 13 bottom placed a base (convenient for cavity 13 part injection), the 6 thin copper column 5 respectively through the thin copper column mounting hole 10 installed in thin copper column fixed groove 6, and thin copper column 5 between each other do not contact, also do not contact device main body 4 inner surface. Subsequently in the device main body 4 cavity 13 injection, forming the filler 9, the filler 9 filled in the device main body 4 cavity 13 around the thin copper column 5, and with the device main body 4 and thin copper column 5 is in full contact, its contact surface with the device main body 4 thus forming with the device main body internal thread 19 matching external thread 21, with the thin copper column 5 contact surface thus forming with the thin copper column external thread 20 matching internal thread 22. Injection is completed after taking off the base, thus forming the complete lithium battery internal and external line communication device.

[0046] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A device for connecting the internal and external circuits of a lithium battery, which is installed in the top cover of the lithium battery and connected with the internal lead of the lithium battery, characterized in that, It includes bolt-like device body, several thin copper columns and filling by injection molding, the device body is fixedly installed in the lithium battery top cover, the device body is provided with several thin copper column mounting holes corresponding to the position of the bolt head, a cavity is opened corresponding to the position of the screw rod, the main body of the thin copper column is located in the cavity of the device body, one end of the thin copper column is fixed in the thin copper column mounting hole, the other end is connected with the internal lead of the lithium battery, the filling is filled in the cavity of the device body around the thin copper column, the filling is provided with several fixed through holes, and the thin copper column is located in the fixed through hole.

2. The device for connecting internal and external circuits of a lithium battery according to claim 1, characterized in that: The device body is provided with a thin copper column fixing groove corresponding to the position of the bolt head, and the thin copper column mounting hole is located in the thin copper column fixing groove.

3. The device according to claim 1, wherein the device is characterized by: The device body is provided with a device body inner thread, and the outer surface of the thin copper column is provided with a thin copper column outer thread; the filling is filled in the cavity of the device body around the thin copper column and fully contacts with the device body and the thin copper column, and the contact surface with the device body has an outer thread matched with the device body inner thread, and the contact surface with the thin copper column has an inner thread matched with the thin copper column outer thread.

4. The device for connecting internal and external circuits of a lithium battery according to claim 1, characterized in that: The length of the device body is greater than the thickness of the lithium battery top cover, the device body corresponding to the bolt head part is welded in the lithium battery top cover, and the top surface of the device body is flush with the top surface of the lithium battery top cover.

5. The device for connecting internal and external circuits of a lithium battery according to claim 1, characterized in that: The device body, filling and several thin copper columns are located in the part of the outer surface of the lithium battery, and are covered with a layer of high barrier co-extrusion film.

6. The device for connecting internal and external circuits of a lithium battery according to claim 1, characterized in that: The thin copper column is provided with 6.

7. The device according to claim 1, wherein the device is characterized by: It also includes a thimble connector, the thimble connector includes a connector top cover and several connector thimbles, the connector thimbles are installed in the connector top cover; the connector thimbles are provided with springs and connector thimble heads inside, one end of the spring is fixed in the connector thimble, the other end is fixedly connected with the connector thimble head, and the connector thimble head is connected with the thin copper column.

8. The device according to claim 7, wherein: The thimble connector also includes several connector components, and the connector components are installed in the connector top cover.

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