Battery pack, battery system and vehicle

Abstract

The invention provides a battery pack, a battery system and a vehicle. The battery pack comprises a first frame, a second frame, a third frame, a fourth frame, a first joint and a second joint, the first frame, the second frame, the third frame and the fourth frame are connected end to end to define a cavity, and a battery cell is arranged in the cavity; the second frame is provided with a first connector, and the fourth frame is provided with a second connector. The battery cell comprises a first battery cell module and a second battery cell module which are mutually independent and are both formed by connecting a plurality of battery cells in series; the two ends of the first battery cell module and the second battery cell module are electrically connected with the first connector and the second connector respectively; the first connector and the second connector have matched structural design and can be detachably and electrically connected with each other, so that the first battery cell modules of adjacent battery packs are connected in series, and the second battery cell modules of adjacent battery packs are connected in series. The space utilization rate of the battery pack and the series connection efficiency of the battery pack can be optimized, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the automotive field, and in particular, to a battery pack, a battery system and a vehicle. Background Art

[0002] With the development of science and technology, and the increasing attention paid by the country and society to environmental protection, electric vehicles powered by electricity have been more and more widely used. Electric vehicles have the characteristics of low noise, high efficiency, low exhaust emissions, and can save a lot of fuel energy.

[0003] However, the current battery system of electric vehicles is composed of a single battery pack or multiple battery packs in series and parallel. A system composed of a single battery pack cannot flexibly expand the power of the battery system, and the development of a large-capacity battery pack has the disadvantage of high development costs. A battery system composed of multiple battery packs can flexibly expand the power, and the battery pack development cost is low, but the existing multi-pack solution has low space utilization because the battery packs cannot fit tightly together, and wiring harnesses are required for connection. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a battery pack, a battery system and a vehicle to solve the technical defects that the battery packs cannot fit tightly together, resulting in low space utilization and the need for wiring harness connection, optimize the space utilization of the battery pack and the series connection efficiency of the battery pack, and reduce costs.

[0005] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0006] According to a first aspect of the present invention, there is provided a battery pack, comprising a first frame, a second frame, a third frame, a fourth frame, a first connector, and a second connector;

[0007] The first frame, the second frame, the third frame, and the fourth frame are connected end to end to form a cavity, a battery cell is arranged in the cavity, and the second frame and the fourth frame are not connected to each other;

[0008] The second frame is provided with a first connector, the fourth frame is provided with a second connector, and the first connector and the second connector are both provided with a low-voltage terminal and a high-voltage terminal;

[0009] The battery cell comprises a first battery cell module and a second battery cell module, the first battery cell module and the second battery cell module are independent of each other and are both composed of a plurality of battery cells connected in series;

[0010] Two ends of the first battery cell module are electrically connected to the first connector and the second connector respectively, and two ends of the second battery cell module are electrically connected to the first connector and the second connector respectively;

[0011] The first connector and the second connector have matching structural designs and can be detachably electrically connected to each other, so that the first battery cell modules of adjacent battery packs are connected in series with each other, and the second battery cell modules are connected in series with each other.

[0012] Preferably, the first joint is embedded in the second frame, and the second joint is embedded in the fourth frame.

[0013] Preferably, the positive and negative electrodes of the first connector are connected through a wiring harness. At this time, the first battery cell module and the second battery cell module in a single battery pack are connected in series through the first connector, and the battery pack can only transmit electricity to the outside through the second connector.

[0014] According to a second aspect of the present invention, there is provided a battery system comprising any one of the above-mentioned battery packs.

[0015] According to a third aspect of the present invention, there is provided a vehicle comprising a battery pack as described above.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides matchable battery pack connectors to enable adjacent battery packs to fit tightly together and complete electrical connection between adjacent battery packs, thereby optimizing the space utilization of the battery packs and the series connection efficiency of the battery packs and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 is an external schematic diagram of the battery pack described in Example 1;

[0020] Figure 2 is a schematic diagram of the interior of the battery pack described in Example 1;

[0021] Figure 3 is an external schematic diagram of the first joint in Example 1;

[0022] Figure 4 is a schematic structural diagram of the first joint in Example 1;

[0023] Figure 5 is an external schematic diagram of the second joint in Example 1;

[0024] Figure 6 This is a schematic diagram of the structure of the second joint in Example 1.

[0025] The figure shows:

[0026] 100-Battery Pack

[0027] 110-First border

[0028] 120-Second border

[0029] 130-First connector

[0030] 131-First high voltage male terminal

[0031] 132-Low voltage male terminal

[0032] 133-Second high voltage male terminal

[0033] 134-First male terminal

[0034] 135-Second male terminal

[0035] 140-Third border

[0036] 150-Fourth border

[0037] 160-Second connector

[0038] 161-First high voltage female terminal

[0039] 162-Low voltage female terminal

[0040] 163-Second high voltage female terminal

[0041] 164-First female termination point

[0042] 165-Second female termination point

[0043] 500-cell

[0044] 510-First battery module

[0045] 520-Second battery module DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0048] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In addition, all directional indications in this application (such as up, down, left, right, front, back, bottom...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions involving "first", "second", etc. in the application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0049] Example 1

[0050] This example provides a battery pack for solving the technical defects of low space utilization caused by the inability of battery packs to fit tightly together and the need for wiring harness connection.

[0051] The battery pack 100 provided in this embodiment is as follows Figure 1 , Figure 2 As shown, it includes a first frame 100, a second frame 120, a third frame 140, a fourth frame 150, a first connector 130, and a second connector 160. The first frame 100, the second frame 120, the third frame 140, and the fourth frame 150 are connected end to end to form a cavity, and a battery cell 500 is arranged in the cavity. The second frame 120 and the fourth frame 150 are not connected to each other, and correspondingly, the first frame 100 and the third frame 140 are not connected to each other.

[0052] like Figure 2 As shown, the two ends of the battery cell 500 are electrically connected to the first connector 130 and the second connector 160 respectively. The battery cells are distributed in an even number of columns, divided into 4 columns or more, and further divided into a first battery cell module 510 and a second battery cell module 520. Among them, the first battery cell module 510 and the second battery cell module 520 are independent of each other, and both are composed of a number of battery cells connected in series. The two ends of the first battery cell module 510 are connected to the first male terminal connection point 134 and the first female terminal connection point 164 through a busbar. Similarly, the two ends of the second battery cell module 520 are connected to the second male terminal connection point 135 and the second female terminal connection point 165 through a busbar.

[0053] like Figure 2-Figure 6As shown, the first connector 130 is installed on the second frame 120 of the battery pack 100, and the second connector 160 is installed on the fourth frame 150 of the battery pack 100. Both the first connector 130 and the second connector 160 have low-voltage and high-voltage terminals, and the first connector 130 and the second connector 160 have matching structural designs and can be detachably electrically connected to each other. When adjacent battery packs 100 are tightly fitted, the second connector 160 of the previous battery pack 100 is docked with the first connector 130 of the next battery pack 100; or the second connector 160 of the previous battery pack 100 is docked with the first connector 130 of the next battery pack 100.

[0054] After the interface docking, the high voltage and low voltage connection between adjacent battery packs 100 can be realized. Specifically, the first high voltage male terminal 131 of the first connector 130 can be stably electrically connected to the second high voltage female terminal 163 of the second connector 160; the low voltage male terminal 132 of the first connector 130 can be stably electrically connected to the low voltage female terminal 162 of the second connector 160; the second high voltage male terminal 133 of the first connector 130 can be stably electrically connected to the first high voltage female terminal 161 of the second connector 160. After the interface docking, the first battery cell modules 510 of adjacent battery packs 100 are connected in series, and the second battery cell modules 520 of adjacent battery packs 100 are connected in series.

[0055] In the first connector 130, the first male terminal 134 is connected to the first high-voltage male terminal 131, and the second male terminal 133 is connected to the second high-voltage male terminal 133, so that the first high-voltage male terminal 131 and the second high-voltage male terminal 133 are connected to the high-voltage wiring harness in the battery pack 100. Similarly, the low-voltage male terminal 132 is connected to the low-voltage wiring harness in the battery pack 100.

[0056] Similarly, in the second connector 160, the first female terminal point 164 is connected to the first high-voltage female terminal 161, and the second female terminal point is connected to the second high-voltage female terminal 163, so that the first high-voltage female terminal 161 and the second high-voltage female terminal 163 are connected to the high-voltage wire harness in the battery pack 100. Similarly, the low-voltage female terminal 162 is connected to the low-voltage wire harness in the battery pack 100.

[0057] Preferably, the first connector 130 is embedded in the second frame 120, and the second connector 160 is embedded in the fourth frame 150, so that after the first connector 130 and the second connector 160 of adjacent battery packs 100 are connected, the gap between the second frame 120 and the fourth frame 150 of adjacent battery packs 100 is small, which facilitates stacking of multiple battery packs 100 along the length direction and maintains a close fit between adjacent battery packs 100.

[0058] Preferably, the positive and negative electrodes of the first connector 130 can be connected through a wiring harness. In this case, the first battery cell module 510 and the second battery cell module 520 in a single battery pack 100 are connected in series through the first connector 130, and the battery pack 100 can output power to the outside only through the second connector 160.

[0059] The battery pack of this embodiment can make adjacent battery packs fit closely together and can complete the electrical connection between adjacent battery packs, thereby optimizing the space utilization of the battery pack and the series connection efficiency of the battery pack and reducing the cost.

[0060] Example 2

[0061] This embodiment provides a battery system, which is composed of several battery packs described in Embodiment 1 and electrically connected through a first connector and a second connector.

[0062] According to the battery system of this embodiment, through the special design of the battery pack, adjacent battery packs can be closely fitted and the electrical connection between adjacent battery packs can be completed, thereby optimizing the space utilization of the battery pack and the series connection efficiency of the battery pack and reducing costs.

[0063] It should be pointed out that the explanation of the implementation method and beneficial effects of the vehicle battery pack in the above-mentioned embodiment 1 is also applicable to the battery system of this embodiment. In order to avoid redundancy, it will not be expanded here in detail.

[0064] Example 3

[0065] This embodiment provides a vehicle, which includes the battery pack described in Embodiment 1.

[0066] According to the vehicle of this embodiment, the special design of the battery pack can make adjacent battery packs fit tightly and complete the electrical connection between adjacent battery packs, thereby optimizing the space utilization of the battery pack and the series connection efficiency of the battery pack and reducing costs.

[0067] Specifically, electric vehicles include but are not limited to pure electric vehicles and hybrid electric vehicles.

[0068] It should be pointed out that the explanation of the implementation method and beneficial effects of the vehicle battery pack in the above-mentioned embodiment 1 is also applicable to the vehicle of this embodiment. In order to avoid redundancy, it will not be expanded here in detail.

[0069] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A battery pack, characterized in that: It includes a first frame, a second frame, a third frame, a fourth frame, a first joint, and a second joint; The first frame, the second frame, the third frame, and the fourth frame are connected end to end to form a cavity, a battery cell is arranged in the cavity, and the second frame and the fourth frame are not connected to each other; The second frame is provided with a first connector, the fourth frame is provided with a second connector, and the first connector and the second connector are both provided with a low-voltage terminal and a high-voltage terminal; The battery cell comprises a first battery cell module and a second battery cell module, the first battery cell module and the second battery cell module are independent of each other and are both composed of a plurality of battery cells connected in series; Two ends of the first battery cell module are electrically connected to the first connector and the second connector respectively, and two ends of the second battery cell module are electrically connected to the first connector and the second connector respectively; The first connector and the second connector have matching structural designs and can be detachably electrically connected to each other, so that the first battery cell modules of adjacent battery packs are connected in series with each other, and the second battery cell modules are connected in series with each other.

2. The battery pack according to claim 1, characterized in that: The first joint is embedded in the second frame, and the second joint is embedded in the fourth frame.

3. The battery pack according to claim 1, characterized in that: The positive and negative electrodes of the first connector are connected through a wiring harness. At this time, the first battery cell module and the second battery cell module in a single battery pack are connected in series through the first connector, and the battery pack can only transmit electricity to the outside through the second connector.

4. A battery system, characterized in that: A battery pack comprising any one of claims 1 to 3.

5. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 3.

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