CN204407434U - A Safe Polymer Lithium-ion Battery Pack Structure - Google Patents

Abstract

The utility model belongs to the technical field of battery packs, in particular to a safe polymer lithium ion battery pack structure, which comprises a battery pack and a shell, wherein the battery pack is composed of a plurality of polymer lithium ion batteries which are connected in series and/or in parallel; the battery pack is provided with a temperature control circuit breaker, a total positive plate, a total negative plate and a charging input connector, wherein the temperature control circuit breaker is connected with the total negative plate in series and then connected with the total positive plate on the charging input connector together to form a charging protection circuit. Compared with the prior art, the utility model discloses a set up temperature detect circuit breaker on the group battery, when the group battery was in high temperature state because unusual charging, temperature detect circuit breaker was the state of opening circuit to the emergence of the incident that prevents the decline of the battery performance that the group battery charged and lead to under high temperature environment and cause can improve the safety in utilization of group battery widely.

Description

A Safe Polymer Lithium-ion Battery Pack Structure

technical field

The utility model belongs to the technical field of battery packs, more specifically, the utility model relates to a safe polymer lithium-ion battery pack structure.

Background technique

As a kind of clean energy, polymer lithium-ion battery has been widely used in various electronic products, such as smart Mobile phones, notebook computers, digital cameras and portable small appliances, etc.

With the extensive use of polymer lithium-ion batteries in electronic products and the continuous improvement of battery energy density, the safety of batteries needs to be further strengthened, especially for batteries composed of multiple polymer lithium-ion batteries connected in series and/or in parallel If one of the polymer lithium-ion batteries is abnormally charged (such as high-temperature charging, overcharging, etc.), then the entire battery pack will have a very serious safety hazard.

In order to improve the safety of the battery pack, protection devices such as overvoltage and over temperature are usually installed inside the charger. When the battery pack is abnormally charged, these protection devices can play a certain protective role. However, when the protection circuit components inside the charger are abused, disassembled or encounter failures, the battery pack loses the protection of the charger protection device during charging, thereby increasing the potential safety hazard of the battery pack.

In addition, at present, most of the connections of multi-parallel battery packs adopt the method of PCM adapter board. Connect to the PCM motherboard to form a loop. This assembly method is relatively complicated, the operation is difficult, and the defect rate is high, and the manufacturing cost is relatively high.

In view of this, it is indeed necessary to provide a safe polymer lithium-ion battery pack structure, which can greatly improve the safety of the battery pack by adding a temperature-controlled circuit breaker. The process is simple and feasible, and the operation difficulty is low, and the manufacturing cost Low, low defect rate, and more secure and reliable.

Utility model content

One of the purposes of the utility model is to provide a safe polymer lithium-ion battery pack structure for the deficiencies of the prior art, which can greatly improve the safety of the battery pack by adding a temperature-controlled circuit breaker.

In order to achieve the above object, the utility model adopts the following technical solutions:

A safe polymer lithium-ion battery pack structure, comprising a battery pack composed of several polymer lithium-ion batteries connected in series and/or parallel, and a casing, the battery pack being placed in the casing;

The battery pack is provided with a temperature-controlled circuit breaker, a total positive electrode piece, a total negative electrode piece and a charging input connector, and the temperature-controlled circuit breaker is connected in series with the total negative electrode piece and then connected with the total positive electrode piece A charging protection circuit is formed on the charging input connector.

As an improvement of the structure of the safe polymer lithium-ion battery pack of the present invention, the battery pack is also provided with a discharge output connector, and the total positive electrode sheet and the total negative electrode sheet are connected to the lead wire through the main circuit. The discharge output connector is connected to form a discharge circuit.

As an improvement of the safe polymer lithium-ion battery pack structure of the utility model, the tabs of the polymer lithium-ion battery are connected through connecting pieces, and the connecting pieces are connected with voltage signal detection leads, and the voltage The signal detection leads are also connected to the charging input connector to form a voltage detection circuit.

As an improvement of the structure of the safe polymer lithium-ion battery pack of the utility model, the connecting piece is a connecting nickel piece, a connecting copper piece or a flexible printed circuit board.

As an improvement of the safe polymer lithium-ion battery pack structure of the utility model, the tabs and the connecting pieces are connected by laser welding, spot welding, ultrasonic welding or soldering.

As an improvement of the safe polymer lithium-ion battery pack structure of the utility model, insulating paper is arranged between the tabs and the connecting piece, compressed foam is filled between adjacent tabs, and A polymer tape is wrapped around the whole composed of the tab and the compressed foam.

As an improvement of the safe polymer lithium-ion battery pack structure of the utility model, an adhesive layer is provided between adjacent polymer lithium-ion batteries, and compressed foam is provided at corners of the battery pack.

As an improvement of the safe polymer lithium-ion battery pack structure of the present invention, the temperature control circuit breaker is arranged between the top sealing edges of two adjacent polymer lithium-ion batteries, and the temperature control A heat conducting material layer is arranged between the circuit breaker and the top of the polymer lithium ion battery which is in contact with the temperature-controlled circuit breaker.

As an improvement of the structure of the safe polymer lithium-ion battery pack of the present invention, the housing includes a left housing, a right housing and an upper cover, and the left housing and the right housing jointly form an accommodating space, The upper cover is closed on the upper ends of the left casing and the right casing and the upper cover is located directly above the battery pack;

The left case includes a first bottom case, a first top case, and a first main case disposed between the first top case and the first bottom case; the right case includes a second bottom case shell, a second top shell, and a second main shell disposed between the second top shell and the second bottom shell; the first bottom shell and the second bottom shell are jointly formed to support the The supporting structure of the battery pack, the first top case and the second top case are both connected to the upper cover.

Compared with the prior art, the utility model is provided with a temperature-controlled circuit breaker on the battery pack. When the battery pack is in a high-temperature state due to abnormal charging, the temperature-controlled circuit breaker is in an open state, thereby preventing the battery pack from being charged in a high-temperature environment. The degradation of battery performance and the occurrence of safety accidents, and if the battery temperature rises abnormally during the charging process, the temperature-controlled circuit breaker can cut off the charging current in time, so as to achieve the purpose of safety protection, which can greatly improve the battery life. Improve the use safety of the battery pack. And when the temperature of the battery drops to normal temperature, the temperature control circuit breaker is in the closed state again, allowing the battery pack to charge and discharge normally. The utility model has simple structure, simple and reliable temperature protection control mode, and does not need an additional over-temperature detection and protection control circuit, thereby reducing the consumption of battery power without additionally increasing the cost of materials.

Another object of the present utility model is to provide a safe polymer lithium-ion battery pack structure assembly process, comprising the following steps:

In the first step, several polymer lithium-ion batteries are placed side by side in the auxiliary fixture, and the tabs of the polymer lithium-ion batteries are connected by connecting pieces to form a total positive electrode sheet and a total negative electrode sheet, so that several of the Polymer lithium-ion batteries are combined into battery packs in series and/or parallel;

In the second step, a charging input connector and a temperature-controlled circuit breaker are arranged on the upper end of the battery pack, so that the temperature-controlled circuit breaker is connected in series with the total negative plate and then connected with the total positive plate on the On the charging input connector, a charging protection circuit is formed;

In the third step, insulating paper is arranged between the tabs and the connecting piece, and compressed foam is pasted on the corners of the battery pack, and finally the battery pack is placed in the casing.

As an improvement of the assembly process of the safe polymer lithium-ion battery pack structure of the present invention, the second step also includes the step of setting a discharge output connector and a main circuit connection lead wire on the battery pack, so that the total positive pole The sheet and the total negative electrode sheet are connected to the discharge output connector through the main circuit connecting lead to form a discharge circuit.

As an improvement of the assembly process of the safe polymer lithium-ion battery pack structure of the present invention, the second step also includes connecting a voltage signal detection lead wire on the connecting piece, and connecting the voltage signal detection lead wire with the The step of connecting the charging input connector to form a voltage detection circuit.

As an improvement of the assembly process of the safe polymer lithium-ion battery pack structure of the present invention, the first step also includes the step of setting an adhesive layer between adjacent polymer lithium-ion batteries, and the third step also includes It includes setting insulating paper between the tabs and the connecting piece, filling compressed foam between adjacent tabs, and wrapping polymer around the entire body composed of the tabs and the compressed foam. Tape steps.

As an improvement of the assembly process of the safe polymer lithium-ion battery pack structure of the present invention, the temperature-controlled circuit breaker in the second step is arranged between the top sealing edges of two adjacent polymer lithium-ion batteries. space, and the second step also includes the step of setting a thermally conductive material layer between the temperature-controlled circuit breaker and the top of the polymer lithium-ion battery in contact with the temperature-controlled circuit breaker.

Compared with the prior art, the utility model skillfully utilizes the connecting piece for circuit series connection, and uses the temperature control circuit breaker to realize the purpose of safety protection. The structure is simple and the process is optimized, which makes the whole assembly process simple and easy to manufacture The cost is greatly reduced, the defective rate is greatly reduced, and the structure of the battery pack is safer and more reliable. In addition, the assembled battery pack structure has low internal resistance and stable electrical performance.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of Embodiment 1 of the present utility model.

Fig. 2 is a schematic diagram of an exploded structure of Embodiment 1 of the present utility model.

Fig. 3 is a schematic diagram of an exploded structure of the battery pack in Embodiment 1 of the present utility model.

Fig. 4 is a schematic perspective view of the three-dimensional structure of the battery pack in Embodiment 1 of the present utility model.

in:

1-battery pack, 2-voltage signal detection leads, 3-shell, 31-left shell, 311-first bottom shell, 312-first top shell, 313-first main shell, 32-right shell , 321-second bottom case, 322-second top case, 323-second main case, 33-upper cover, 4-temperature control circuit breaker, 5-general positive plate, 6-general negative plate, 7-charging Input connector, 8-discharge output connector, 9-connecting sheet, 10-insulating paper, 11-compressed foam, 12-polymer tape, 13-main circuit connecting lead.

Detailed ways

Example 1

As shown in Figures 1 to 4, a safe polymer lithium-ion battery pack structure provided by this embodiment includes a battery pack 1 and an outer casing composed of several polymer lithium-ion batteries connected in series and/or in parallel 3. The battery pack 1 is placed in the casing 3; wherein, the battery pack 1 is used for charging and discharging. The casing 3 is used to fix the battery pack 1 .

The battery pack 1 is provided with a temperature-controlled circuit breaker 4, a total positive electrode piece 5, a total negative electrode piece 6, and a charging input connector 7. On the charging input connector 7, a charging protection circuit is formed. Among them, the working principle of the temperature-controlled circuit breaker 4 is: when the battery pack 1 is in a high-temperature state, the temperature-controlled circuit breaker 4 is in an open circuit state, thereby preventing the battery performance of the battery pack 1 from being charged in a high-temperature environment. In addition, if the battery temperature rises abnormally during the charging process, the temperature-controlled circuit breaker 4 can cut off the charging current in time, so as to achieve the purpose of safety protection and greatly improve the use safety of the battery pack 1. sex. And when the temperature of the battery drops to normal temperature, the temperature control circuit breaker 4 is in a closed state again, allowing the battery pack to be charged and discharged normally.

The battery pack 1 is also provided with a discharge output connector 8, and the total positive electrode sheet 5 and the total negative electrode sheet 6 are connected to the discharge output connector 8 through the main circuit connecting lead 13 to form a discharge circuit for use by client devices.

The polymer lithium-ion batteries are connected through connecting sheets 9 . Preferably, the connecting sheet 9 is a connecting nickel sheet, a connecting copper sheet or a flexible printed circuit board, or an electronic wire, and of course it can also be other connecting sheet 9 that can function as a conductive connection. The tabs and the connecting piece 9 are connected by laser welding, spot welding, ultrasonic welding or soldering, and of course other welding methods can also be used.

An insulating paper 10 is arranged between the tab and the connecting piece 9, and the material of the insulating paper 10 is Dupont paper, polyimide paper or fireproof fast paper, etc., so as to play an insulating role between the tab and the connecting piece 9 . Compressed foam 11 is filled between adjacent tabs, and the compressed foam 11 can play a supporting role, and a polymer tape 12 is wrapped around the whole composed of tabs and compressed foam 11. In this embodiment, The polymer adhesive tape 12 is a polyimide adhesive tape to fix the tab and the compressed foam 11 as a whole.

Adjacent polymer lithium-ion batteries are provided with an adhesive layer, the adhesive layer is made of double-sided adhesive tape or polyimide tape, and the corners of the battery pack 1 are provided with compressed foam 11. The shrinkage of the cotton 11 can fasten the battery pack 1 inside the casing 3 .

The connection piece 9 is connected with a voltage signal detection lead wire 2, and the voltage signal detection lead wire 2 is also connected with the charging input connector 7 to form a voltage detection circuit. That is to say, the voltage signal detection leads 2 are connected to the positive and negative poles of each monomer polymer lithium ion battery and lead to the charge input connector 7 for charging balance function. The voltage detection circuit can detect voltage, discriminate Abnormal condition of the circuit.

The temperature-controlled circuit breaker 4 is arranged between the top sealing edges of two adjacent polymer lithium-ion batteries, and between the temperature-controlled circuit breaker 4 and the top of the polymer lithium-ion battery in contact with the temperature-controlled circuit breaker 4 is provided with layer of thermally conductive material. The temperature-controlled circuit breaker 4 can be arranged between the top seals of any two polymer lithium-ion batteries, and the setting of the heat-conducting material layer can make the temperature-controlled circuit breaker 4 accurately sense the heating degree of the polymer lithium-ion battery, thereby improving the temperature-controlled circuit breaker 4. The sensitivity of heat conduction reliably realizes the safety protection of prohibiting charging of the battery under high temperature conditions. The temperature protection control method is simple and reliable, and does not require an additional over-temperature detection and protection control circuit, thus avoiding the consumption of battery power and the increase of material costs caused by the additional over-temperature detection and protection control circuit. Certainly, the temperature-controlled circuit breaker 4 can also be arranged at the bottom of the battery pack 1 or any other position that can contact the polymer lithium-ion battery.

The casing 3 includes a left casing 31, a right casing 32 and an upper cover 33, the left casing 31 and the right casing 32 jointly form an accommodating space, the upper cover 33 covers the upper ends of the left casing 31 and the right casing 32 and The upper cover 33 is located right above the battery pack 1 . The left case 31 , the right case 32 and the upper cover 33 form a space in which the battery pack 1 can be firmly fixed.

The left casing 31 includes a first bottom casing 311, a first top casing 312, and a first main casing 313 disposed between the first top casing 312 and the first bottom casing 311; the right casing 32 includes a second bottom casing. The case 321, the second top case 322, and the second main case 323 disposed between the second top case 322 and the second bottom case 321; the first bottom case 311 and the second bottom case 321 are jointly formed to support the battery pack 1, the first top case 312 and the second top case 322 are both connected to the upper cover 33. This shell 3 has a simple structure, is easy to disassemble and install, and has low manufacturing cost.

The shell 3 is set as a plastic shell, that is, the left shell 31 , the right shell 32 and the upper cover 33 are all made of plastic, so as to play the role of insulation, and the plastic shell has higher strength and longer service life.

Example 2

This embodiment provides an assembly process for the safe polymer lithium-ion battery pack structure provided in Embodiment 1, including the following steps:

The first step is to place several polymer lithium-ion batteries (double-sided adhesive tape with release paper on the battery body) side by side in the auxiliary fixture, and use laser welding to connect the nickel sheet to the tabs of the polymer lithium-ion battery. Connect them to form the total positive electrode sheet 5 and the total negative electrode sheet 6, and then tear off the double-sided adhesive release paper, so that several polymer lithium-ion batteries are combined into a battery pack 1 by connecting in series and/or in parallel;

In the second step, a charging input connector 7, a temperature-controlled circuit breaker 4, a discharge output connector 8 and a main circuit connection lead 13 are arranged on the upper end of the battery pack 1, so that the temperature-controlled circuit breaker 4 is connected in series with the total negative plate 6 (through soldering mode) and then connected to the charging input connector 7 together with the total positive plate 5 to form a charging protection circuit; wherein, the temperature control circuit breaker 4 is arranged on the top seal of two adjacent polymer lithium-ion batteries Between the sides, and between the temperature-controlled circuit breaker 4 and the top of the polymer lithium-ion battery in contact with the temperature-controlled circuit breaker 4, a thermally conductive material layer is set;

The total positive plate 5 and the total negative plate 6 are connected to the discharge output connector 8 through the main circuit connecting lead 13 to form a discharge circuit;

The voltage signal detection lead wire 2 is connected to the nickel plate, and the voltage signal detection lead wire 2 is connected to the charging input connector 7 to form a voltage detection circuit.

The third step is to set DuPont paper between the tabs and the connecting nickel sheet, paste the compressed foam 11 on the corner of the battery pack 1, and then place the battery pack 1 on the left casing 31 and the right casing 32. In the accommodating space, the battery pack 1 can be fastened inside the accommodating space by utilizing the shrinkage of the compressed foam 11 . Then, the compressed foam 11 is filled between the adjacent tabs, and the polyimide tape is wound around the whole composed of the tabs and the compressed foam 11, and finally the upper cover 33 is fastened to complete the assembly of the entire battery pack structure.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also make appropriate changes and modifications to the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (9)

1. A safe polymer lithium-ion battery structure, characterized in that: it includes a battery pack and an outer shell made up of several polymer lithium-ion batteries connected in series and/or in parallel, and the battery pack is placed in the inside the shell; The battery pack is provided with a temperature-controlled circuit breaker, a total positive electrode piece, a total negative electrode piece and a charging input connector, and the temperature-controlled circuit breaker is connected in series with the total negative electrode piece and then connected with the total positive electrode piece A charging protection circuit is formed on the charging input connector. 2. The safe polymer lithium-ion battery pack structure according to claim 1, characterized in that: the battery pack is also provided with a discharge output connector, and the total positive pole piece and the total negative pole piece pass through the main circuit The connecting lead is connected with the discharge output connector to form a discharge circuit. 3. The safe polymer lithium-ion battery pack structure according to claim 1, characterized in that: the tabs of the polymer lithium-ion battery are connected through a connecting piece, and the connecting piece is connected with a voltage signal detection Lead wires, the voltage signal detection lead wires are also connected to the charging input connector to form a voltage detection circuit. 4. The safe polymer lithium-ion battery pack structure according to claim 3, characterized in that: the connecting piece is a connecting nickel piece, a connecting copper piece or a flexible printed circuit board. 5. The safe polymer lithium-ion battery pack structure according to claim 3, characterized in that: the tabs and the connecting pieces are connected by laser welding, spot welding, ultrasonic welding or soldering. 6. The safe polymer lithium-ion battery pack structure according to claim 3, characterized in that: insulating paper is arranged between the tabs and the connecting piece, and the adjacent tabs are filled with The foam is compressed, and a polymer tape is wrapped around the whole composed of the lug and the compressed foam. 7. The safe polymer lithium-ion battery pack structure according to claim 1, characterized in that: an adhesive layer is arranged between adjacent said polymer lithium-ion batteries, and the corner positions of said battery pack are all set With compression foam. 8. The safe polymer lithium-ion battery pack structure according to claim 1, characterized in that: the temperature-controlled circuit breaker is arranged between the top seals of two adjacent polymer lithium-ion batteries, In addition, a thermally conductive material layer is provided between the temperature-controlled circuit breaker and the top of the polymer lithium-ion battery in contact with the temperature-controlled circuit breaker. 9. The safe polymer lithium-ion battery pack structure according to claim 1, characterized in that: the casing includes a left casing, a right casing and an upper cover, and the left casing and the right casing have a common forming an accommodating space, the upper cover is closed on the upper ends of the left case and the right case and the upper cover is located directly above the battery pack; The left case includes a first bottom case, a first top case, and a first main case disposed between the first top case and the first bottom case; the right case includes a second bottom case shell, a second top shell, and a second main shell disposed between the second top shell and the second bottom shell; the first bottom shell and the second bottom shell are jointly formed to support the The supporting structure of the battery pack, the first top case and the second top case are both connected to the upper cover.