Power battery pack

Abstract

The utility model discloses a power battery pack which comprises a plurality of battery modules which are sequentially connected in series through connecting wires, the battery module comprises a first shell, a second shell and a plurality of battery cells; all the battery cells are arranged in a space formed between the first shell and the second shell, and the first shell and the second shell are connected through a dismounting mechanism; an intermediate conductor is fixed on the first shell, and a positive electrode conductor and a negative electrode conductor are fixed on the second shell; all the battery cells are divided into two groups, and the two groups of battery cells are respectively connected in parallel between the positive conductor and the middle conductor and between the negative conductor and the middle conductor; the positive conductor and the negative conductor are respectively provided with a positive connecting lug and a negative connecting lug; and the connecting wire is used for connecting the positive electrode connecting lugs and the negative electrode connecting lugs of different battery modules. According to the utility model, a modularized structure is adopted, so that the battery modules can be conveniently combined as required, the battery cells can be conveniently replaced and maintained by detaching the first shell and the second shell, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a power battery pack. Background Art

[0002] The power battery pack is an important part of electric vehicles and electric bicycles. The structure of the existing mainstream power battery pack is shown in patent CN114976454A, which includes a frame, an isolation frame and multiple batteries. The isolation frame divides the space inside the frame into multiple accommodating cavities, and all batteries are placed in different accommodating cavities. This power battery pack has the following disadvantages: its volume is fixed, the combination is not flexible, and it is inconvenient to disassemble and maintain, and it is difficult to meet the production requirements of different battery capacities. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a power battery pack that is easy to assemble and disassemble.

[0004] Technical solution: To achieve the above purpose, the utility model provides a power battery pack, which includes a plurality of battery modules, all of which are sequentially connected in series through connecting wires;

[0005] The battery module comprises a first shell, a second shell and a plurality of battery cells; all the battery cells are placed in a space formed between the first shell and the second shell, and the first shell and the second shell are connected by a disassembly mechanism;

[0006] An intermediate conductor is fixed on the first shell, and a positive conductor and a negative conductor are fixed on the second shell; all the battery cells are divided into two groups, and the two groups of battery cells are respectively connected in parallel between the positive conductor and the intermediate conductor and between the negative conductor and the intermediate conductor; the positive conductor and the negative conductor have a positive connecting ear and a negative connecting ear respectively; the connecting wire is used to connect the positive connecting ear and the negative connecting ear of different battery modules.

[0007] Furthermore, an equal number of first positive electrode connecting parts and first negative electrode connecting parts are formed on the intermediate conductor; a second positive electrode connecting part is formed on the positive electrode conductor, and a second negative electrode connecting part is formed on the negative electrode conductor.

[0008] Furthermore, a buckle portion and a slot portion are formed on the first shell and the second shell respectively, and the buckle portion and the slot portion can be buckled and fixed.

[0009] Furthermore, each of the battery modules has end plates at both ends; the intermediate conductor is placed between the first shell and one of the end plates; and the positive electrode conductor and the negative electrode conductor are placed between the second shell and another of the end plates.

[0010] Furthermore, all the battery modules are arranged in a linear array, and two adjacent battery modules share the end plate. A BMS circuit board is also included, and the end plate of the battery module at the end has a receiving groove, and the BMS circuit board is fixed in the receiving groove.

[0011] Furthermore, the two sides of the end plate located in the middle are the first shell and the second shell belonging to the two battery modules respectively; the first shell and the second shell on both sides of the same end plate are connected by screws. The first shell and the second shell have a first connecting part and a second connecting part for connecting screws respectively.

[0012] Furthermore, the power battery pack also includes an FPC board, on which a plurality of temperature sensors are distributed, and each of the battery modules has a corresponding temperature sensor; an end of the FPC board has an interface portion, and all of the temperature sensors are connected to the interface portion through lines laid out on the FPC board.

[0013] Beneficial effects: The power battery pack of the utility model has the following beneficial effects:

[0014] (1) A modular structure is adopted. In the same battery module, all the battery cells of the same battery module are divided into two parts, connected in parallel and then in series, so that the battery modules can be combined as needed to form a large power battery pack. The battery cells can be replaced and maintained conveniently by disassembling the first shell and the second shell, which is easy to operate.

[0015] (2) The control system can collect temperature data from all temperature sensors in real time and determine whether the temperature is normal, so as to monitor the charging and discharging process of the battery pack and prevent thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a first three-dimensional structural diagram of a power battery pack;

[0017] Figure 2 is a second three-dimensional structural diagram of a power battery pack;

[0018] Figure 3 This is the exploded structure diagram of the power battery pack;

[0019] Figure 4 for Figure 1 The enlarged structure diagram of part A in the middle;

[0020] Figure 5 for Figure 1 The enlarged structure diagram of part B;

[0021] Figure 6 for Figure 2The enlarged structure diagram of the middle C part;

[0022] Figure 7 This is the structural diagram of the FPC board;

[0023] Figure 8 This is a diagram of the connection structure of the battery cells in the power battery pack.

[0024] In the figure: 1-battery module; 11-first shell; 11a-first connecting part; 1a-buckle part; 12-second shell; 12a-second connecting part; 1b-slot part; 13-battery cell; 14-intermediate conductor; 14a-first positive electrode connecting part; 14b-first negative electrode connecting part; 15-positive electrode conductor; 15a-positive electrode connecting ear; 15b-second positive electrode connecting part; 16-negative electrode conductor; 16a-negative electrode connecting ear; 16b-second negative electrode connecting part; 17-end plate; 2-connecting wire; 3-FPC board; 31-temperature sensor; 32-interface part; 4-BMS circuit board. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] like Figure 1-3 The power battery pack includes a plurality of battery modules 1, all of which are connected in series in sequence through a connecting line 2; the battery module 1 includes a first shell 11, a second shell 12 and a plurality of battery cells 13; all of the battery cells 13 are placed in a space formed between the first shell 11 and the second shell 12, and the first shell 11 and the second shell 12 are connected by a disassembly mechanism; an intermediate conductor 14 is fixed on the first shell 11, and a positive conductor 15 and a negative conductor 16 are fixed on the second shell 12; all of the battery cells 13 are divided into two groups, and the two groups of battery cells 13 are respectively connected in parallel between the positive conductor 15 and the intermediate conductor 14 and between the negative conductor 16 and the intermediate conductor 14; the positive conductor 15 and the negative conductor 16 have a positive connection ear 15a and a negative connection ear 16a respectively; Figure 6 As shown, the connecting wire 2 is used to connect the positive electrode connecting ear 15 a and the negative electrode connecting ear 16 a of different battery modules 1 .

[0027] The intermediate conductor 14 is formed with an equal number of first positive electrode connecting portions 14a and first negative electrode connecting portions 14b; the positive electrode conductor 15 is formed with a second positive electrode connecting portion 15b, and the negative electrode conductor 16 is formed with a second negative electrode connecting portion 16b. In this embodiment, the positive electrode conductor 15 and the negative electrode conductor 16 are both nickel sheets.

[0028] like Figure 8In the embodiment shown, each battery module 1 includes 8 battery cells 13, and the 8 battery cells 13 are divided into two battery cell groups. The 4 battery cells contained in each battery cell group are connected in parallel, and the battery cell groups are connected in series. The battery cell groups corresponding to adjacent battery modules 1 are connected in series through connecting lines 2. The schematic diagram is shown in FIG. Figure 8 In other embodiments, the battery module 1 may further include more battery cells 13 , such as 10 or 12 battery cells, and correspondingly, each battery cell group includes 5 or 6 battery cells 13 .

[0029] like Figure 5 As shown, a buckle portion 1a and a slot portion 1b are respectively formed on the first shell 11 and the second shell 12, and the buckle portion 1a and the slot portion 1b can be buckled and fixed.

[0030] By adopting the above structure, a modular structure is adopted. In the same battery module 1, all the battery cells 13 of the same battery module 1 are divided into two parts, which are connected in parallel and then in series, so that the battery modules 1 can be conveniently combined as needed to form a large power battery pack. The battery cells 13 can be conveniently replaced and maintained by disassembling the first shell 11 and the second shell 12, and the operation is convenient.

[0031] Preferably, each of the battery modules 1 has an end plate 17 at both ends; the intermediate conductor 14 is placed between the first shell 11 and one of the end plates 17; the positive conductor 15 and the negative conductor 16 are placed between the second shell 12 and another of the end plates 17. All the battery modules 1 are arranged in a linear array, and two adjacent battery modules 1 share the end plate 17. The power battery pack also includes a BMS circuit board 4, and the end plate 17 of the battery module 1 at the end has a receiving groove, and the BMS circuit board 4 is fixed in the receiving groove. The BMS circuit board 4 is used to connect the battery module 1 and can manage charging and discharging.

[0032] The two sides of the end plate 17 located in the middle are the first shell 11 and the second shell 12 belonging to the two battery modules 1 respectively; the first shell 11 and the second shell 12 on the two sides of the same end plate 17 are connected by screws. Figure 4 As shown, the first shell 11 and the second shell 12 respectively have a first connecting portion 11 a and a second connecting portion 12 a for connecting screws.

[0033] The power battery pack also includes an FPC board 3, such as Figure 7As shown, a plurality of temperature sensors 31 are distributed on the FPC board 3, and each of the battery modules 1 has a corresponding temperature sensor 31; an interface portion 32 is provided at the end of the FPC board 3, and all the temperature sensors 31 are connected to the interface portion 32 through the lines arranged on the FPC board 3. In actual use, the interface portion 32 is connected to the control system, and the control system can collect temperature data of all temperature sensors 31 in real time and determine whether the temperature is normal, so as to monitor the charging and discharging process of the battery pack and prevent thermal runaway.

[0034] In addition, all battery modules 1 can be installed in the aluminum shell casing, and the aluminum shell casing has lock buckles at both ends, which can easily fix the battery pack in the frame. The lock buckles have power output terminals, which can be connected to power units such as motors to output electricity. The aluminum shell casing can increase the strength of the battery pack. The aluminum shell casing also has end caps at both ends, which are used for dust prevention and insulation and waterproofing. There are also rubber shockproof pads between the aluminum shell casing and the battery module 1 to insulate the internal terminal from contacting the aluminum shell casing.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A power battery pack, characterized in that: It comprises a plurality of battery modules (1), all of which are sequentially connected in series via connecting wires (2); The battery module (1) comprises a first shell (11), a second shell (12) and a plurality of battery cells (13); all the battery cells (13) are placed in a space formed between the first shell (11) and the second shell (12); the first shell (11) and the second shell (12) are connected via a disassembly mechanism; An intermediate conductor (14) is fixed on the first shell (11), and a positive conductor (15) and a negative conductor (16) are fixed on the second shell (12); all the battery cells (13) are divided into two groups, and the two groups of battery cells (13) are respectively connected in parallel between the positive conductor (15) and the intermediate conductor (14) and between the negative conductor (16) and the intermediate conductor (14); the positive conductor (15) and the negative conductor (16) have a positive connecting ear (15a) and a negative connecting ear (16a) respectively; the connecting wire (2) is used to connect the positive connecting ear (15a) and the negative connecting ear (16a) of different battery modules (1).

2. The power battery pack according to claim 1, characterized in that: The intermediate conductor (14) is formed with an equal number of first positive electrode connecting parts (14a) and first negative electrode connecting parts (14b); the positive electrode conductor (15) is formed with a second positive electrode connecting part (15b), and the negative electrode conductor (16) is formed with a second negative electrode connecting part (16b).

3. The power battery pack according to claim 1, characterized in that: A buckle portion (1a) and a slot portion (1b) are respectively formed on the first shell (11) and the second shell (12).

4. The power battery pack according to claim 1, characterized in that: Each of the battery modules (1) has end plates (17) at both ends; the intermediate conductor (14) is placed between the first shell (11) and one of the end plates (17); and the positive electrode conductor (15) and the negative electrode conductor (16) are placed between the second shell (12) and another of the end plates (17).

5. The power battery pack according to claim 4, characterized in that: It also includes a BMS circuit board (4), wherein the end plate (17) of the battery module (1) at the end has a receiving groove, and the BMS circuit board (4) is fixed in the receiving groove.

6. The power battery pack according to claim 5, characterized in that: The first shell (11) and the second shell (12) belonging to the two battery modules (1) are located on both sides of the end plate (17) in the middle; the first shell (11) and the second shell (12) on both sides of the same end plate (17) are connected by screws.

7. The power battery pack according to claim 1, characterized in that: It also comprises an FPC board (3), on which a plurality of temperature sensors (31) are distributed, and each of the battery modules (1) has a corresponding temperature sensor (31); an end of the FPC board (3) has an interface portion (32), and all of the temperature sensors (31) are connected to the interface portion (32) via lines arranged on the FPC board (3).

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