Battery module and battery pack

Abstract

The utility model discloses a kind of battery module and battery pack, it relates to power battery technical field, its box body includes multiple first connecting plate and at least one second connecting plate, first connecting plate has mutually spaced inner plate layer and outer plate layer, multiple first connecting plate are sequentially connected, to at least coat the three side surfaces of first space circumference, and first end first connecting plate and terminal first connecting plate are spaced apart, to form the part of the circumferential wall of box body;Second connecting plate is single plate layer structure, and second connecting plate is connected between first end first connecting plate and terminal first connecting plate, to form the remaining part of the circumferential wall of box body.The battery module of the application is based on the cooperation of the inner plate layer and outer plate layer of first connecting plate, can provide better structural protection for battery cell group, avoid deformation in the case where box body vibrates.The battery pack of the application applies the above-mentioned battery module, and has the beneficial effects possessed by the above-mentioned battery module.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery module and battery pack. Background Technology

[0002] A battery module is a structural unit assembled from multiple battery cells. Compared to a single battery cell, a battery module can provide higher voltage and capacity and is an important component of a battery system. It is widely used in electric vehicles, energy storage devices and consumer electronics products.

[0003] Currently, existing battery modules, based on lightweight considerations, typically employ a single-layer plate structure for their casing to meet the energy density requirements within the battery module. However, the structural strength of a single-layer plate structure is limited. In automotive battery modules, if the casing's rigidity is insufficient, it is prone to deformation under vehicle vibrations. This can cause the casing to compress the internal battery cells, leading to cell shell rupture, electrode deformation, or separator puncture, resulting in internal short circuits and increasing the risk of thermal runaway in the battery module. Utility Model Content

[0004] The purpose of this utility model is to provide a battery module and battery pack, which improves the structural strength of the housing by configuring a first connecting plate and a second connecting plate for the housing, and the cooperation between the first connecting plate and the second connecting plate prevents the housing from deforming under vehicle vibration.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A battery module having a first direction and a second direction perpendicular to each other, the battery module comprising:

[0007] The box has a first space inside;

[0008] The battery cell assembly is disposed within the first space; and...

[0009] The housing includes multiple first connecting plates and at least one second connecting plate, wherein,

[0010] The first connecting plate has an inner plate layer and an outer plate layer that are spaced apart from each other, and there is a first channel between the inner plate layer and the outer plate layer. Furthermore, a plurality of the first connecting plates are connected in sequence to cover at least three sides of the first space in the circumferential direction, and the first connecting plate at the beginning and the first connecting plate at the end are spaced apart to form part of the peripheral wall of the box.

[0011] The second connecting plate is a single-layer structure, and the second connecting plate is connected between the first connecting plate at the beginning and the first connecting plate at the end to form the remaining part of the peripheral wall of the box.

[0012] Based on the above-mentioned battery module, this application also provides a battery pack, including a housing and at least two of the above-mentioned battery modules, wherein the two battery modules are disposed within the housing and are electrically connected by series connection or parallel connection.

[0013] Compared with the prior art, the battery module and battery pack implemented in this application have the following advantages:

[0014] The battery module of this application, through the cooperation of a first connecting plate and a second connecting plate, constitutes the housing of the battery module. Based on the cooperation of the inner and outer plates of the first connecting plate, the battery module provides better structural protection for the cell assembly, preventing deformation of the housing under vehicle vibration. Furthermore, the cooperation of the second connecting plate effectively increases the assembly space inside the housing, which is beneficial for increasing the energy density inside the battery module. The battery pack of this application uses the above-described battery module and possesses the beneficial effects of the aforementioned battery module. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the battery module in an embodiment of this application;

[0016] Figure 2 This is a partial schematic diagram of the box body in an embodiment of this application;

[0017] Figure 3 yes Figure 2 Enlarged view of A in the middle;

[0018] Figure 4 This is a top view of the box in an embodiment of this application;

[0019] Figure 5 This is a schematic diagram of the second connecting plate in an embodiment of this application.

[0020] In the diagram, 100 represents the battery module; X represents the first direction; Y represents the second direction; Z represents the third direction; 1 represents the housing; 1a represents the first connecting plate; 1a1 represents the inner plate layer; 1a2 represents the outer plate layer; 1a3 represents the first channel; 1a31 represents the first cavity; 1a32 represents the second cavity; 1a4 represents the reinforcing rib; 1b represents the second connecting plate; 1b1 represents the first section; 1b2 represents the second section; 2 represents the battery cell assembly; 3 represents the battery management module; 3a represents the main control module; 3b represents the slave control module; 4 represents the supporting beam; and 5 represents the first space. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] In the description of this utility model, it should be understood that when an element is referred to as "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] In the description of this utility model, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0025] Example

[0026] refer to Figure 1-5 This embodiment provides a battery module 100, which has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other. The output interface of the battery module 100 is the front side, the side opposite to the front side is the rear side, the front-rear direction is the first direction X of the housing 1, the two opposite sides where the large surface of the housing 1 of the battery module 100 is located are the upper side and the lower side, the vertical direction is the third direction Z of the housing 1, and the left-right direction of the housing 1 is the second direction Y of the housing 1.

[0027] refer to Figure 1-5The battery module 100 of this embodiment includes a housing 1, a cell assembly 2, and a battery management module 3. The housing 1 has a first space 5, the cell assembly 2 is disposed in the first space 5, and the battery management module 3 is disposed in the housing 1 but outside the first space 5, and the battery management module 3 is electrically connected to the cell assembly 2. The housing 1 includes a plurality of first connecting plates 1a and at least one second connecting plate 1b. The first connecting plate 1a has an inner plate layer 1a1 and an outer plate layer 1a2 that are spaced apart from each other, and a first channel 1a3 is provided between the inner plate layer 1a1 and the outer plate layer 1a2. The plurality of first connecting plates 1a are connected in sequence to cover at least three sides of the first space 5 in the circumferential direction, and the first connecting plate 1a at the beginning and the first connecting plate 1a at the end are spaced apart to form part of the peripheral wall of the housing 1. The second connecting plate 1b has a single-layer structure and is connected between the first connecting plate 1a at the beginning and the first connecting plate 1a at the end to form the remaining part of the peripheral wall of the housing 1.

[0028] The battery module 100 is formed by the cooperation of a first connecting plate 1a and a second connecting plate 1b, which together constitute the housing 1 of the battery module 100. The first connecting plate 1a covers the outer periphery of the first space 5. Based on the cooperation of the inner plate layer 1a1 and the outer plate layer 1a2 of the first connecting plate 1a, the battery module 100 can provide better structural protection for the cell assembly 2 arranged in the first space 5, and avoid the deformation of the housing 1 caused by vehicle vibration from affecting the cell assembly 2. Moreover, based on the cooperation of the second connecting plate 1b, the battery module 100 can use the area where the second connecting plate 1b is located as a light load area, and use the second connecting plate 1b to install electrical connectors and other structures connected to the vehicle. In this way, the second connecting plate 1b will not be subjected to excessive compression during vehicle operation, and the second connecting plate 1b can provide sufficient protection for the battery module 100. Thus, the second connecting plate 1b can effectively increase the assembly space inside the housing 1, which is conducive to increasing the energy density inside the battery module 100.

[0029] It should be noted that the enclosure 1 refers to a closed or semi-closed structure made of materials such as metal and plastic. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. Furthermore, the enclosure 1 provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components within the enclosure 1, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The enclosure 1 typically includes an upper enclosure and a lower enclosure. The lower enclosure includes a base plate and side plates connected to and surrounding the base plate. The upper enclosure is connected to the side plates and has a cover plate opposite to the base plate. The upper and lower enclosures together define the space for accommodating the battery modules. The battery pack enclosure 1 generally consists of an upper enclosure and a lower enclosure. The lower enclosure typically has four side plates and a base plate. The four side plates surround the perimeter of the base plate and can be integrally formed with the base plate or manufactured using a separate, fixed connection method. The enclosure 1 can be cast from materials such as steel plate or aluminum alloy, or it can be made of lightweight materials, such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials. The shape of the enclosure 1 can be cylindrical, cuboid, cube, etc.

[0030] It should be noted that the battery cell assembly 2 described in this embodiment is a battery cell assembly 2 composed of individual battery cells. Each individual battery cell can store chemical energy and controllably convert this chemical energy into electrical energy. In recyclable batteries, individual battery cells can be recharged after discharge to reactivate the active materials and continue to be used. Each individual battery cell has a cell body, tabs, and a casing. The cell body typically includes a separator and two electrodes with opposite polarities, namely a positive electrode and a negative electrode. The cell body operates by the movement of metal ions between the positive and negative electrodes. The cycling process of the cell body is the process of metal ions moving from the positive electrode to the negative electrode and then from the negative electrode to the positive electrode. The separator of the individual battery cell is typically a porous insulating material, whose main function is to isolate the positive and negative electrodes while allowing lithium ions to pass through.

[0031] Separators typically have a termination point (i.e., the end position of the separator winding), which is connected to a fixing point to keep the separator taut. For example, in some single-cell batteries, the termination point of the separator is connected to an insulating tape as a fixing element. One end of the insulating tape is adhered to the termination point of the separator, and the other end is adhered to another position on the separator. By pulling the insulating tape in, the separator can be taut, thereby firmly covering the electrode sheets.

[0032] The tabs are electrically connected to the electrode plates of a single battery cell and are an integral part of the cell. The tabs electrically connected to the electrode plates typically include a positive tab and a negative tab. The positive tab is electrically connected to the positive electrode plate, and the negative tab is electrically connected to the negative electrode plate. The single battery cell is charged and discharged through the positive and negative tabs. Of course, both the positive and negative tabs are tab layers of the single battery cell, and they are stacked sequentially to form the tabs of the single battery cell. Therefore, the stacking direction of the tab layers is usually the same as the stacking direction of the electrode plates.

[0033] Tabs are typically current collector structures or composite current collector structures. Tabs with current collector structures usually include a metal layer; that is, in this type of tab, the tab layer is a metal layer. Tabs with composite current collector structures include both a metal layer and a non-metal layer; that is, in this type of tab, the tab layer consists of both a metal layer and a non-metal layer. The metal layer can be made of aluminum or copper, and the non-metal layer can be a polymer layer, such as polypropylene (PP), polyimide (PI), or polyethylene terephthalate (PET).

[0034] It should be noted that the casing is used to encapsulate individual battery cells and electrolyte components. The casing can come in various shapes and sizes, such as cylindrical, cuboid, and hexagonal prisms. The shape of the casing is determined based on the specific shape and size of the individual battery cell. The casing can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloys.

[0035] In the battery module 100, there is a Battery Management System (BMS) 3. The BMS is used to detect the operating status of the battery module 100 and its internal individual cells, and to manage the battery module 100 and its internal individual cells. The Battery Management System 3 includes a Battery Management Unit (BMU), a Cell Measurement Circuit (CMC), sensors, and some electronic control devices. Furthermore, the Battery Management System 3 also includes at least one processor and a memory. The memory can be built into the Battery Management System 3 or externally located outside the Battery Management System 3. The memory can also be a remotely configured memory connected to the Battery Management System 3 via a network.

[0036] In some battery modules 100, the battery management module 3 communicates with the vehicle's controller via a CAN bus. The area where the battery management module 3 is located is a light-load area of ​​the battery module 100. For this, refer to... Figure 1-5In some battery modules 100, the battery management module 3 may be located at least partially inside the second connecting plate 1b and close to the second connecting plate 1b; the second connecting plate 1b is provided with a connection port that cooperates with the battery management module 3. In this way, the area where the second connecting plate 1b is located is a light load area, and the battery module 100 can avoid the second connecting plate 1b from being subjected to excessive load and deformed during the operation of the battery module 100.

[0037] refer to Figure 1-5 In some battery modules 100, a reinforcing rib 1a4 is provided between the inner plate layer 1a1 and the outer plate layer 1a2 to enhance the structural strength of the first connecting plate 1a. Of course, the reinforcing rib 1a4 can be arranged in various ways. For example, the reinforcing rib 1a4 can extend along the length direction of the first connecting plate 1a and be an integral structure along the length direction of the first connecting plate 1a; or, the reinforcing rib 1a4 can extend along the length direction of the first connecting plate 1a and be a segmented structure along the length direction of the first connecting plate 1a, with each segment of the reinforcing rib 1a4 spaced apart along the length direction of the first connecting plate 1a.

[0038] refer to Figure 1-5 In some battery modules 100, the inner plate layer 1a1, the outer plate layer 1a2, and the reinforcing rib 1a4 can be formed by bending a single plate. In this way, the inner plate layer 1a1, the outer plate layer 1a2, and the reinforcing rib 1a4 form an integral connection structure. The connection between the inner plate layer 1a1 and the reinforcing rib 1a4, and the connection between the outer plate layer 1a2 and the reinforcing rib 1a4, has better structural strength, avoiding deformation and cracking of the housing 1 at the connection between the inner plate layer 1a1 and the reinforcing rib 1a4, and at the connection between the outer plate layer 1a2 and the reinforcing rib 1a4.

[0039] It is understandable that the reinforcing rib 1a4 is located within the first channel 1a3. Extending along the length of the first connecting plate 1a, the reinforcing rib 1a4 can divide the first channel 1a3 into two cavities. For example, refer to... Figure 1-5 As an example of this embodiment, the first channel 1a3 includes a first cavity 1a31 and a second cavity 1a32. A reinforcing rib 1a4 separates the first cavity 1a31 and the second cavity 1a32. In this way, the battery module 100 can use the first cavity 1a31 and the second cavity 1a32 to arrange wire harnesses with different directions. For example, the first cavity 1a31 can be used to arrange the input wire harness, and the second cavity 1a32 can be used to arrange the output wire harness. This makes the wire harness layout inside the battery module 100 neat and facilitates the assembly and maintenance of the battery module 100.

[0040] Of course, the number of turns of the input and output wiring harnesses may differ in different battery modules 100, and correspondingly, the channel volumes of the first cavity 1a31 and the second cavity 1a32 may differ in different battery modules 100. For example, taking a section perpendicular to the axial direction of the first channel 1a3 as the cross-section, the cross-sectional area of ​​the first cavity 1a31 is equal to the cross-sectional area of ​​the second cavity 1a32, or the cross-sectional areas of the first cavity 1a31 and the second cavity 1a32 are not equal.

[0041] Understandably, the thickness of the second connecting plate 1b affects its structural strength and the energy density inside the battery module 100. If the thickness of the first connecting plate 1a is too large, the internal space of the housing 1 will be shortened, affecting the energy density inside the battery module 100. If the thickness of the second connecting plate 1b is too small, its structural strength will be insufficient, and the housing 1 will be easily deformed by compression. Therefore, in some battery modules 100, the thickness of the second connecting plate 1b is D1 mm, and 0.8 mm ≤ D1 mm ≤ 2 mm.

[0042] For example, the thickness D1 of the second connecting plate 1b can be 0.8, 0.85, 0.9, 0.93, 0.97, 1, 1.2, 1.4, 1.7, 1.9, 2, or any value from 0.8 to 2.

[0043] Similar to the second connecting plate 1b, the first connecting plate 1a also affects the structural strength of the second connecting plate 1b and the energy density inside the battery module 100. For the first connecting plate 1a, the thickness of its inner layer 1a1 and outer layer 1a2 should be controlled within a certain range. For example, in some battery modules 100, the thickness of the inner layer 1a1 is D3 mm, and 0.6 mm ≤ D3 mm ≤ 2 mm; the thickness of the outer layer 1a2 is D4 mm, and 0.6 mm ≤ D4 mm ≤ 2 mm.

[0044] For example, the thickness D3 of the inner plate layer 1a1 can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.93, 0.97, 1, 1.2, 1.4, 1.7, 1.9, 2, or any value from 0.6 to 2.

[0045] For example, the thickness D4 of the outer panel layer 1a2 can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.93, 0.97, 1, 1.2, 1.4, 1.7, 1.9, 2, or any value from 0.6 to 2.

[0046] It should be noted that when the housing 1 is deformed by compression, the outer plate layer 1a2 will deform towards the inner plate layer 1a1. In this case, the first channel 1a3, located between the outer plate layer 1a2 and the inner plate layer 1a1, can reduce the degree of compression of the inner plate layer by the outer plate layer 1a2. Of course, the length H1 of the first channel 1a3 in the second direction Y and the length H2 of the first channel 1a3 in the third direction Z will affect the mitigation effect of the first channel 1a3. The lengths H1 and H2 of the first channel 1a3 in the second direction Y are suitable for the specifications of the battery module 100. For example, in some battery modules 100, the length of the first channel 1a3 in the second direction Y is H1 mm, and 15 mm ≤ H1 mm ≤ 30 mm; the length of the first channel 1a3 in the third direction Z is H2 mm, and 20 mm ≤ H2 mm ≤ 100 mm.

[0047] For example, the length H1 of the first channel 1a3 in the second direction Y can be 15, 15.6, 16, 16.4, 17, 17.6, 18, 18.3, 19, 19.2, 20, 20.8, 21, 21.5, 22, 22.6, 23, 23.1, 24, 24.7, 25, 25.8, 26, 26.3, 27, 27.4, 28, 28.5, 29, 29.2, 30, or any value from 15 to 30.

[0048] For example, the length H2 of the first channel 1a3 in the third direction Z can be 20, 22, 26, 30, 32, 35, 40, 44, 49, 50, 51, 56, 60, 62, 66, 70, 74, 79, 80, 82, 86, 90, 92, 97, 100, or any value from 20 to 100.

[0049] In some battery modules 100, the second connecting plate 1b may have designs such as folds or bends to adapt the battery module 100 to the assembly environment inside the vehicle. (Reference) Figure 1-5 As an example of this embodiment, in this type of battery module 100, the second connecting plate 1b may include a first segment 1b1 and a second segment 1b2 that are connected to each other. The first segment 1b1 and the second segment 1b2 are integrally connected structures, and the first segment 1b1 is inclined to the first connecting plate 1a to which it is connected, and is inclined to the second segment 1b2.

[0050] It should be noted that the junction of the first segment 1b1 and the second segment 1b2 can be rounded. In this way, the length of the first segment 1b1 and the length of the second segment 1b2 are respectively the length of the straight line segment of the first segment 1b1 and the length of the straight line segment of the second segment 1b2.

[0051] Understandably, the degree of bending of the second connecting plate 1b affects the internal volume of the housing 1 and its assembly. If the bending degree of the second connecting plate 1b is too large, it will be difficult to form, and the connection between the first segment 1b1 and the second segment 1b2 of the second connecting plate 1b will easily tear during the forming process, affecting the airtightness and structural strength of the housing 1. At the same time, if the bending degree of the second connecting plate 1b is too large, the internal space of the housing 1 will be reduced, affecting the arrangement of electrical components, wiring harnesses, etc. inside the battery module 100. If the bending degree of the second connecting plate 1b is too small, it will be difficult for the second connecting plate 1b to adapt to the assembly environment inside the vehicle, making it difficult to install the battery module 100. In response, some battery modules 100 consider constraining the bending degree of the second connecting plate 1b by bending angle. For example, as an example of this embodiment, the first segment 1b1 and the first connecting plate 1a it is connected to have a first included angle α1°, and 120°≤α1°≤150°; the first segment 1b1 and the second segment 1b2 have a second included angle α2°, and 130°≤α2°≤160°.

[0052] For example, the first included angle α1 between the first segment 1b1 and the first connecting plate 1a to which it is connected can be 120, 122, 125, 129, 130, 131, 134, 137, 140, 143, 145, 148, 150, or any value from 120 to 150.

[0053] For example, the second included angle α2 between the first segment 1b1 and the second segment 1b2 can be 120, 122, 125, 129, 130, 131, 134, 137, 140, 143, 145, 148, 150, or any value from 120 to 150.

[0054] In some battery modules 100, the bending degree of the second connecting plate 1b may also be constrained by the length ratio of the first segment 1b1 and the second segment 1b2. For example, as an example of this embodiment, the length of the first segment 1b1 is L3 mm and the length of the second segment 1b2 is L4 mm. The length of the first segment 1b1 L3 mm and the length of the second segment 1b2 L4 mm satisfy: 0.35≤L3 / L4≤0.45.

[0055] For example, the ratio of the length L3 of the first segment 1b1 to the length L4 of the second segment 1b2 can be 0.35, 0.36, 0.38, 0.4, 0.41, 0.43, 0.45, or any value between 0.35 and 0.45.

[0056] Of course, in some battery modules 100, the distance between the first connecting plate 1a at the beginning and the first connecting plate 1a at the end is fixed. It is also possible to consider constraining the bending degree of the second connecting plate 1b by the length of the first segment 1b1 and the second segment 1b2. For example, as an example of this embodiment, the length of the first segment 1b1 is L3 mm, and 260mm≤L3 mm≤290mm; the length of the second segment 1b2 is L4 mm, and 620mm≤L4 mm≤660mm.

[0057] For example, the length L3 of the first segment 1b1 can be 260, 262, 265, 268, 270, 271, 273, 276, 279, 280, 285, 288, 290, or any value from 260 to 290.

[0058] For example, the length L4 of the second segment 1b2 can be 620, 622, 623, 625, 628, 630, 634, 637, 639, 640, 642, 645, 648, 650, 652, 655, 659, 660, or any value from 620 to 660.

[0059] It is understandable that the length of the first connecting plate 1a in the first direction X will affect the volume of the internal space of the housing 1 and the volume occupied on the outside of the housing 1. In some battery modules 100, the length of the first connecting plate 1a in the first direction X is appropriately adjusted according to the vehicle assembly environment. For example, as an example of this embodiment, the length of the first connecting plate 1a in the first direction X is L1 mm, and 1050 mm ≤ L1 mm ≤ 1150 mm.

[0060] For example, the length L1 of the first connecting plate 1a in the first direction X can be 1050, 1060, 1070, 1080, 1090, 1100, 1110, 1120, 1130, 1140, 1150, or any value from 1050 to 1150.

[0061] Of course, the length of the second connecting plate 1b in the second direction Y will also affect the volume of the internal space of the housing 1 and the volume occupied on the outside of the housing 1. In some battery modules 100, the length of the second connecting plate 1b in the second direction Y can also be adjusted according to the vehicle assembly environment. For example, as an example of this embodiment, the length of the second connecting plate 1b in the second direction Y is L2 mm, and 880 mm ≤ L2 mm ≤ 980 mm.

[0062] For example, the length L2 of the second connecting plate 1b in the second direction Y can be 880, 890, 900, 910, 920, 930, 940, 950, 960, 970, 980, or any value from 880 to 980.

[0063] In some battery modules 100, the housing 1 may require better structural strength. These battery modules 100 can enhance the structural stability of the housing 1 by incorporating support structures within the housing 1. For example, see reference... Figure 1-5 As an example of this embodiment, a support beam 4 is provided inside the box body 1. The support beam 4 extends along the second direction Y, and at least a portion of the first connecting plate 1a is provided on both sides of the extension direction of the support beam 4 and connected to the support beam 4.

[0064] It should be noted that in some battery modules 100, there are multiple cell groups 2, arranged along the first direction X. To separate adjacent cell groups 2, a partition structure is configured inside the housing 1. In battery modules 100 equipped with support beams 4, the support beams 4 can be considered as the partition structure separating adjacent cell groups 2. (Reference) Figure 1-5 As an example of this embodiment, there are multiple support beams 4, which are arranged at intervals in the first direction X. In the first direction X, there is a space between two adjacent support beams 4 and between at least one support beam 4 and the first connecting plate 1a. The battery cell assembly 2 is disposed in the space.

[0065] Based on the above-described battery module 100, this embodiment also provides a battery pack, including a housing and at least two of the above-described battery modules 100, wherein the two battery modules 100 are disposed inside the housing and are electrically connected by series connection or parallel connection.

[0066] It should be noted that a battery pack generally includes: a battery pack composed of multiple battery modules 100 connected in series and / or in parallel, a battery management module 3 (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components, etc. The above components are placed inside the casing and sealed with a cover plate to form a complete functional unit that can directly output electrical energy. It is a rechargeable battery and also the power source for new energy vehicles.

[0067] In summary, the battery module 100 provided in this application embodiment, through the cooperation of the first connecting plate 1a and the second connecting plate 1b, constitutes the housing 1 of the battery module 100. Based on the cooperation of the inner plate layer 1a1 and the outer plate layer 1a2 of the first connecting plate 1a, the battery module 100 can provide better structural protection for the cell assembly 2, preventing the housing 1 from deforming under vehicle vibration. Moreover, based on the cooperation of the second connecting plate 1b, the battery module 100 can effectively increase the assembly space inside the housing 1, which is beneficial to increasing the energy density inside the battery module 100. The battery pack of this application embodiment uses the above-described battery module 100 and has the beneficial effects of the above-described battery module 100.

[0068] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery module having a first direction and a second direction that are perpendicular to each other, characterized in that, The battery module includes: The box has a first space inside; The battery cell assembly is disposed within the first space; and... The housing includes multiple first connecting plates and at least one second connecting plate, wherein, The first connecting plate has an inner plate layer and an outer plate layer that are spaced apart from each other, and there is a first channel between the inner plate layer and the outer plate layer. Furthermore, a plurality of the first connecting plates are connected in sequence to cover at least three sides of the first space in the circumferential direction, and the first connecting plate at the beginning and the first connecting plate at the end are spaced apart to form part of the peripheral wall of the box. The second connecting plate is a single-layer structure, and the second connecting plate is connected between the first connecting plate at the beginning and the first connecting plate at the end to form the remaining part of the peripheral wall of the box.

2. The battery module according to claim 1, characterized in that, The battery module further includes a battery management module, which is disposed inside the housing and outside the first space, and is electrically connected to the battery cell assembly; and the battery management module is at least partially located inside the second connecting plate and close to the second connecting plate; the second connecting plate is provided with a connection port that cooperates with the battery management module.

3. The battery module according to claim 1, characterized in that, A reinforcing rib is provided between the inner plate layer and the outer plate layer.

4. The battery module according to claim 3, characterized in that, The reinforcing rib extends along the length of the first connecting plate, and the reinforcing rib is either an integral structure or a segmented structure along the length of the first connecting plate.

5. The battery module according to claim 3, characterized in that, The inner plate, the outer plate, and the reinforcing ribs are an integrally connected structure.

6. The battery module according to claim 3, characterized in that, The first channel includes a first cavity and a second cavity, the reinforcing ribs separate the first cavity and the second cavity, and the cross-sectional area of ​​the first cavity is equal to that of the second cavity, or the cross-sectional area of ​​the first cavity is not equal to that of the second cavity, with the cross-sectional area of ​​the cross-section perpendicular to the axial direction of the first channel as the cross-section.

7. The battery module according to claim 1, characterized in that, The thickness of the second connecting plate is D1 mm, and 0.8 mm ≤ D1 mm ≤ 2 mm.

8. The battery module according to claim 1, characterized in that, The thickness of the inner panel is D2 mm, and 0.6 mm ≤ D3 mm ≤ 2 mm; and / or, the thickness of the outer panel is D3 mm, and 0.6 mm ≤ D4 mm ≤ 2 mm.

9. The battery module according to claim 1, characterized in that, The length of the first channel in the second direction is H1 mm, and 15 mm ≤ H1 mm ≤ 30 mm.

10. The battery module according to claim 1, characterized in that, The housing has a third direction, which is perpendicular to the first direction and the second direction; the length of the first channel in the third direction is H2mm, and 20mm≤H2mm≤100mm.

11. The battery module according to claim 1, characterized in that, The second connecting plate includes a first segment and a second segment that are connected to each other. The first segment and the second segment are integrally connected, and the first segment is inclined to the first connecting plate to which it is connected, and also inclined to the second segment.

12. The battery module according to claim 11, characterized in that, The first segment and the first connecting plate to which it is connected have a first included angle α1°, and 120°≤α1°≤150°; and / or, the first segment and the second segment have a second included angle α2°, and 130°≤α2°≤160°.

13. The battery module according to claim 11, characterized in that, The length of the first segment is L3 mm, the length of the second segment is L4 mm, and 0.35≤L3 / L4≤0.

45.

14. The battery module according to claim 11, characterized in that, The length of the first segment is L3 mm, and 260 mm ≤ L3 mm ≤ 290 mm; and / or, the length of the second segment is L4 mm, and 620 mm ≤ L4 mm ≤ 660 mm.

15. The battery module according to claim 1, characterized in that, The length of the first connecting plate in the first direction is L1 mm, and 1050 mm ≤ L1 mm ≤ 1150 mm.

16. The battery module according to claim 1, characterized in that, The length of the second connecting plate in the second direction is L2 mm, and 880 mm ≤ L2 mm ≤ 980 mm.

17. The battery module according to claim 1, characterized in that, The box is provided with a support beam that extends along the second direction, and at least a portion of the first connecting plate is provided on both sides of the extension direction of the support beam and connected to the support beam.

18. The battery module according to claim 17, characterized in that, The number of support beams is multiple, and the multiple support beams are arranged at intervals in the first direction. In the first direction, there is an accommodating space between two adjacent support beams and between at least one support beam and the first connecting plate. The battery cell assembly is disposed in the accommodating space.

19. A battery pack, characterized in that, It includes a housing and at least two battery modules as described in any one of claims 1-18, wherein the two battery modules are disposed within the housing and are electrically connected.

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