Flexible connection structure between battery module sampling wire harness and battery

Abstract

The flexible connection structure between the battery module sampling wire harness and the battery is composed of the sampling wire harness, a battery plastic frame, a plurality of metal tube springs and the like, a plurality of step round holes are formed in the plane of the battery plastic frame, and one metal tube spring is installed in each step round hole. A sampling contact piece and a temperature sampling sensor of a battery module sampling wire harness are installed between a step round hole of a battery plastic frame and a metal tube spring, and a negative electrode of a metal shell of a cylindrical battery is installed between the step round hole of the battery plastic frame and the metal tube spring. After the arc-shaped elastic piece of the metal tube spring deforms, the negative electrode of the battery metal shell and the sampling contact piece of the sampling wire harness are connected together, and the temperature of the battery metal shell is conducted to the temperature sensor of the sampling wire harness. Potential quality hazards and potential safety hazards caused by the process of welding the battery module sampling wire harness on the battery electrode are fundamentally avoided, the product quality of the battery module is improved, the single battery can be quickly mounted and dismounted, the appearance quality and the battery performance of the single battery are not influenced, and gradient utilization of the single battery is realized.

Description

[Technical field]

[0001] The present invention relates to the field of design and manufacture of new energy battery modules, and is particularly suitable for a soft connection structure between a battery module sampling harness and a battery of a cylindrical battery assembly. [Background technology]

[0002] At present, all battery modules are single-layer battery packs with rated capacity of battery modules formed by parallel connection of single-cell batteries. The voltage of battery modules is increased by series connection of single-layer battery packs to reach the specified rated voltage. The BMS or protection board of the battery module connects the series connection points of each layer of parallel battery packs in the battery series circuit through sampling harnesses, samples the voltage of each layer of battery packs and the temperature of the specific battery shell, monitors the changes of battery pack voltage and temperature, and performs balanced management on each layer of battery packs. At present, the voltage sampling harnesses of battery modules are welded to the battery electrodes of each layer of battery packs. Since the sampling harnesses are relatively thin, the sampling harnesses are easy to open and break. There are quality risks such as open circuit of the sampling harnesses and even short circuit of the battery module circuit during the installation and use process. Welded batteries are difficult to disassemble. Forced disassembly will seriously affect the appearance and battery performance of the single-cell batteries, and cannot meet the requirements of the national government for the cascade utilization of scrapped batteries. [Summary of the invention]

[0003] To solve the above problems, the present invention provides a soft connection structure between a battery module sampling harness and a battery, which utilizes the elasticity and conductivity of a metal tube spring to connect the series connection points of each layer of parallel battery packs in the battery module and the sampling contacts of the battery module sampling harness.

[0004] The soft connection structure between the battery module sampling harness and the battery is composed of a sampling harness, a battery plastic frame and several metal springs. The soft connection structure between the battery module sampling harness and the battery is a combined component of the battery module and is installed on the negative side of the battery metal steel shell of the battery module. The plane of the battery plastic frame is arranged with several stepped circular holes, and each stepped circular hole is installed with a metal spring. The sampling contact of the battery module sampling harness is installed between the inner diameter of the stepped circular hole of the battery plastic frame and the outer diameter of the metal spring. The negative electrode of the metal shell of the cylindrical battery is installed in the middle of the metal spring. After the arc-shaped spring of the metal spring is deformed, the negative electrode of the battery metal shell is connected to the sampling contact of the sampling harness. The temperature sampling sensor of the battery module sampling harness is installed between the hole of the battery plastic frame and the outer diameter of the metal spring. After the arc-shaped spring of the metal spring is deformed, the temperature of the battery metal shell is transmitted to the temperature sensor of the sampling harness.

[0005] The stepped circular holes of the battery plastic frame are arranged in a rectangular or triangular arrangement, and the two end faces of the stepped circular holes are respectively provided with an upper limit step and a lower limit step, which can limit the axial movement of the metal tube spring. The plastic frame is provided with a recessed platform at the position where the sampling harness is installed, and the plastic frame is provided with a hole at the position where the temperature sensor of the sampling harness is installed.

[0006] The metal tube spring is processed into an open circular ring with a metal sheet, and a plurality of inwardly protruding arc-shaped spring pieces are arranged on the circumference of the circular ring. The outer diameter of the metal tube spring is consistent with the inner diameter of the stepped circular hole of the battery plastic frame, and the inner diameter of the arc-shaped spring piece of the metal tube spring is interference fit with the diameter of the battery.

[0007] The battery module sampling harness is composed of a number of wires. One end of the sampling harness is a plug connected to the BMS or protection board, and the other end of the sampling harness is connected to each sampling contact and the temperature sampling sensor. The sampling contact is processed into an arc shape by a metal sheet and is connected to the sampling harness by welding or crimping. The width of the sampling contact is greater than the width of the plastic frame recess, which can prevent the sampling contact from falling off abnormally.

[0008] Preferably, the sampling contact of the battery module sampling harness can be replaced by an inverted "U"-shaped parallel sampling contact. The two wings of the parallel sampling contact are arc-shaped, and the diameter of the arc is consistent with the diameter of the step circular hole of the plastic frame. The parallel sampling contact is installed between two adjacent step circular holes of the plastic frame. The inner diameter surface of the parallel sampling contact is attached to the outer diameter surface of the metal tube spring. The elasticity and conductivity of the metal tube spring are used to connect the negative poles of the adjacent battery metal shells together, so that two batteries can be connected in parallel.

[0009] Preferably, the battery module sampling harness can be formed by a flexible circuit board (FPC for short), which includes a plug, a temperature sampling sensor and a plurality of sampling contacts / parallel sampling contacts. The sampling contacts / parallel sampling contacts of the flexible circuit board are installed between the stepped circular holes of the plastic frame and the metal tube spring. The arc-shaped inner diameter surface of the sampling contacts / parallel sampling contacts that are attached to the outer diameter surface of the metal tube spring are conductively treated.

[0010] The application of the present invention can make the installation of the sampling harness of the battery module and the battery parallel connection process simple and easy, and the connection is reliable. It fundamentally avoids the quality and safety hazards caused by the process of welding the sampling harness of the battery module on the battery electrode, improves the product quality of the battery module, and can realize the rapid installation and disassembly of the single cell. The installation and disassembly will not affect the appearance quality and battery performance of the single cell, thereby realizing the cascade utilization of the single cell.

Brief Description of the Drawings

[0011] Figure 1is an axonometric view of the plastic frame;

[0012] Figure 2 It is an axial view of a metal tube spring;

[0013] Figure 3 It is a partial exploded view of implementation example 1 of the soft connection structure between the battery module sampling harness and the battery;

[0014] Figure 4 It is an axial view of the parallel sampling contact piece;

[0015] Figure 5 is an axial side view of implementation example 2 of the soft connection structure between the battery module sampling harness and the battery;

[0016] Figure 6 yes Figure 5 A partial enlarged cross-sectional view of .

[0017] Among them: 1. Plastic frame; 1-1. Stepped circular hole; 1-2. Lower limit step; 1-3. Upper limit step; 1-4. Concave platform; 1-5. Hole; 2. Metal tube spring; 2-1. Arc-shaped spring; 2-2. Opening; 3. Parallel sampling contact; 3-1. Arc-shaped; 3-2. Two wings; 4. Sampling harness; 4-1. Plug; 4-2. Sampling contact; 4-3. Temperature sampling sensor; 5. Negative pole of battery metal steel shell. [Specific implementation method]

[0018] The present invention is further described in detail below with reference to the accompanying drawings and implementation examples, but the protection scope of the present invention is not limited thereto.

[0019] Implementation Example 1: A soft connection structure between a battery module sampling harness and a battery consisting of 15 batteries connected in series

[0020] like Figure 1 As shown, the battery plastic frame (1) is formed by processing ABS plastic, 15 stepped circular holes (1-1) are arranged on the plane of the battery plastic frame, and the stepped circular holes of the battery plastic frame are arranged in a rectangular shape of 3 rows and 5 columns. The two end faces of the stepped circular holes are respectively provided with an upper limit step (1-2) and a lower limit step (1-3). The battery plastic frame is provided with a concave platform (1-4) at the position where the sampling harness and the sampling contact piece are installed, and the battery plastic frame is provided with a hole (1-5) at the position where the temperature sensor of the sampling harness is installed.

[0021] like Figure 2 As shown, the metal tube spring (2) is made of a stainless steel sheet and processed into a circular ring with an opening (2-2). On the circumference of the circular ring, there are 40 arc-shaped spring pieces (2-1) protruding inwardly. The outer diameter of the metal tube spring is equal to the inner diameter of the stepped circular hole (1-1) of the battery plastic frame. The inner diameter of the arc-shaped spring piece of the metal tube spring is interference fit with the diameter of the battery (5).

[0022] like Figure 3 As shown, the battery module sampling harness (4) is formed by a flexible printed circuit board (FPC), and one end of the sampling harness is connected to the plug (4-1) of the BMS. Figure 5 The other end of the sampling harness (same) is a sampling contact piece (4-2) with 15 voltage sampling points and a temperature sampling sensor (4-3), and the sampling harness also has a harness connected to the total positive electrode of the battery module. The inner arc surface of the sampling contact piece (4-2) is treated for conductivity, and the width of the sampling contact piece is greater than the width of the concave platform (1-4) of the battery plastic frame. The temperature sampling sensor (4-3) is welded on the flexible circuit board and installed in the middle of the cavity (1-5) of the plastic frame.

[0023] The soft connection structure between the battery module sampling harness and the battery is installed on one side of the negative electrode (5) of the battery metal steel shell of the battery module as a combined component of the battery module. A metal tube spring (2) is installed in each stepped circular hole (1-1) of the battery plastic frame, and the sampling contact (4-2) of the battery module sampling harness is installed between the inner diameter of the stepped circular hole of the battery plastic frame and the outer diameter of the metal tube spring. The negative electrode (5) of the metal shell of the cylindrical battery is installed in the middle of the metal tube spring. After the arc-shaped spring piece of the metal tube spring is deformed, the negative electrode of the battery metal shell is connected to the sampling contact of the sampling harness. The temperature sampling sensor (4-3) of the battery module sampling harness is installed between the hole of the battery plastic frame and the outer diameter of the metal tube spring. After the arc-shaped spring piece of the metal tube spring is deformed, the temperature of the battery metal shell is transmitted to the temperature sensor of the sampling harness.

[0024] Implementation Example 2: A 2-parallel 15-series battery module consisting of 30 batteries and a soft connection structure between the sampling harness and the battery

[0025] like Figure 5 As shown, the battery plastic frame (1) is formed by processing ABS plastic, 30 stepped circular holes (1-1) are arranged on the plane of the battery plastic frame, the stepped circular holes of the battery plastic frame are arranged in a triangle, and the two end faces of the stepped circular holes respectively have an upper limit step (1-2) and a lower limit step (1-3). The battery plastic frame is provided with a concave platform (1-4) at the position where the sampling harness voltage sampling contact piece is installed, and the battery plastic frame is provided with a hole (1-5) at the position where the temperature sensor of the sampling harness is installed.

[0026] like Figure 2 As shown, the metal tube spring (2) is processed into a ring shape with an opening (2-2) using a phosphor bronze thin plate, and 50 arc-shaped spring pieces (2-1) protruding inward are arranged on the circumference of the ring shape. The outer diameter of the metal tube spring is equal to the inner diameter of the stepped circular hole (1-1) of the battery plastic frame, and the inner diameter of the arc-shaped spring piece of the metal tube spring is interference fit with the diameter of the battery (5).

[0027] like Figure 4 As shown, the parallel sampling contact piece (3) is processed into an approximately inverted "U" shape using a phosphor bronze thin plate, and the two wings (3-2) of the parallel sampling contact piece are arc-shaped, and the diameter of the arc shape (3-1) is consistent with the diameter of the stepped circular hole (1-1) of the plastic frame. The parallel sampling contact piece is installed between two adjacent stepped circular holes of the plastic frame, and the parallel sampling contact piece is attached to the outer diameter surface of the metal tube spring, and the elasticity and conductive properties of the metal tube spring are used to connect the adjacent negative electrodes (5) of the battery metal shells in parallel.

[0028] like Figure 5 As shown, the battery module sampling harness (4) is composed of 18 wires, one end of the sampling harness is a plug (4-1) connected to the protection board, the other end of the sampling harness is connected to 15 parallel sampling contacts (3) and 1 temperature sampling sensor (4-3), and another harness is connected to the total positive electrode of the battery module.

[0029] The soft connection structure between the battery module sampling harness and the battery is installed on one side of the negative electrode (5) of the battery metal steel shell of the battery module as a combined component of the battery module. A metal tube spring (2) is installed in each stepped circular hole (1-1) of the battery plastic frame, 15 parallel sampling contacts (3) are installed in the middle of the concave platform (1-4) between two adjacent stepped circular holes of the plastic frame, the two wings (3-2) of the parallel sampling contacts are installed between the inner diameter of the stepped circular hole of the battery plastic frame and the outer diameter of the metal tube spring, the negative electrode (5) of the battery metal shell is installed in the middle of the metal tube spring, and the arc-shaped spring of the metal tube spring is deformed to connect the negative electrode of the battery metal shell with the sampling contact of the sampling harness. The temperature sampling sensor (4-3) of the battery module sampling harness is installed between the hole (1-5) of the battery plastic frame and the outer diameter of the metal tube spring, and the arc-shaped spring of the metal tube spring is deformed to conduct the temperature of the battery metal shell to the parallel sampling contact and the temperature sensor.

Claims

1. The soft connection structure between the battery module sampling harness and the battery is composed of a sampling harness, a battery plastic frame and a number of metal springs, and is characterized in that: A plurality of stepped circular holes are arranged on the plane of the battery plastic frame, and a metal tube spring is installed in each stepped circular hole. The sampling contact of the battery module sampling harness is installed between the inner diameter of the stepped circular hole of the battery plastic frame and the outer diameter of the metal tube spring. The negative electrode of the metal shell of the cylindrical battery is installed in the middle of the metal tube spring. After the arc-shaped spring piece of the metal tube spring is deformed, the negative electrode of the metal shell of the battery is connected with the sampling contact of the sampling harness. The temperature sampling sensor of the battery module sampling harness is installed between the hole of the battery plastic frame and the outer diameter of the metal tube spring. After the arc-shaped spring piece of the metal tube spring is deformed, the temperature of the battery metal shell is transmitted to the temperature sensor of the sampling harness.

2. The soft connection structure between the battery module sampling harness and the battery according to claim 1 is characterized in that: The stepped circular holes of the battery plastic frame are arranged in a rectangular or triangular shape, and the two end faces of the stepped circular holes are respectively provided with an upper limit step and a lower limit step, which can limit the axial movement of the metal tube spring. The plastic frame is provided with a recessed platform at the position where the sampling harness is installed, and the plastic frame is provided with a hole at the position where the temperature sensor of the sampling harness is installed.

3. The soft connection structure between the battery module sampling harness and the battery according to claim 1, characterized in that: The battery module sampling harness is composed of a number of wires. One end of the sampling harness is a plug connected to the BMS or protection board, and the other end of the sampling harness is connected to each sampling contact and the temperature sampling sensor. The sampling contact is processed into an arc shape by a metal sheet and is connected to the sampling harness by welding or crimping. The width of the sampling contact is greater than the width of the plastic frame recess, which can prevent the sampling contact from falling off abnormally.

4. The soft connection structure between the battery module sampling harness and the battery according to claim 1, characterized in that: The sampling contact of the battery module sampling harness can be replaced by an inverted "U"-shaped parallel sampling contact. The two wings of the parallel sampling contact are arc-shaped, and the diameter of the arc is consistent with the diameter of the step circular hole of the plastic frame. The parallel sampling contact is installed between two adjacent step circular holes of the plastic frame. The inner diameter surface of the parallel sampling contact is attached to the outer diameter surface of the metal tube spring. The elasticity and conductivity of the metal tube spring are used to connect the negative poles of the adjacent battery metal shells together, so that two batteries can be connected in parallel.

5. The soft connection structure between the battery module sampling harness and the battery according to claim 1, characterized in that: The battery module sampling harness can be formed by a flexible circuit board (FPC). The flexible circuit board includes a plug, a temperature sampling sensor and a plurality of sampling contacts / parallel sampling contacts. The sampling contacts / parallel sampling contacts of the flexible circuit board are installed between the stepped circular holes of the plastic frame and the metal tube spring. The arc-shaped inner diameter surface of the sampling contacts / parallel sampling contacts that are attached to the outer diameter surface of the metal tube spring are conductively treated.

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