Lightweight compact battery module

Abstract

The utility model discloses a lightweight compact battery module and belongs to the technical field of power batteries. The light-weight compact battery module comprises a plurality of battery cells, the large surfaces of the plurality of battery cells are close to each other to form battery cell rows, at least two battery cell rows are arranged in parallel to form a battery cell group, and the battery cell rows are separated by middle heat dissipation plates; in the battery cell row, a plurality of battery cells form battery cell units, and heat insulation sheets are arranged among the battery cell units; and the positions of the heat insulation sheets in each battery cell row are the same or different. According to the utility model, the breathing space of each battery cell unit can be gathered to the two sides of the heat insulation sheet, so that the breathing space of each battery cell is not obviously reduced, and the cycle performance of the battery module is also not obviously reduced. The battery module is more compact, the quality energy density of the battery is improved, and the performance of the battery is not reduced.

Description

Technical Field

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

[0002] Due to the growing demand for energy conservation and environmental protection, electric vehicles such as electric bicycles and electric cars are becoming more and more widely used. For these electric vehicles, batteries play a vital role and significance as a power source, which is directly related to the manufacturing cost, service life, etc. of these electric vehicles.

[0003] Today, the development of electric vehicles is booming, and there is an increasing demand for direct performance comparison between electric vehicles and fuel vehicles. That is, the power system of electric vehicles requires a lower energy consumption ratio and a higher cost advantage. Reducing the height of electric vehicles can effectively reduce the resistance of the entire vehicle, thereby reducing energy consumption. Therefore, the volume limit of the Pack is becoming more and more stringent, and the early development of the industry attaches great importance to mass energy density. When the existing battery is formed into a module, too many components are set inside, resulting in a large battery module volume and low mass energy density. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] In view of the problem that existing battery modules are large in size and low in mass energy density, the utility model provides a lightweight and compact battery module, which reduces the volume of the battery module and improves the mass energy density of the battery module.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0008] The utility model discloses a lightweight and compact battery module, comprising a plurality of battery cells, wherein the large surfaces of the plurality of battery cells are close to each other to form a battery cell row, and at least two rows of battery cell rows are arranged in parallel to form a battery cell group, and the battery cell rows are separated by a middle heat dissipation plate;

[0009] In the battery cell row, a plurality of battery cells form a battery cell unit, and heat insulation sheets are arranged between the battery cell units; the positions of the heat insulation sheets in each row of battery cells are the same or different.

[0010] As a further improvement of the present invention, in each battery cell unit, the battery cells are arranged closely to each other.

[0011] As a further improvement of the present invention, in the battery cell unit, the number of battery cells does not exceed 4.

[0012] As a further improvement of the present invention, the terminals of all the battery cells in the battery cell group face the same direction, an FPC component is arranged on the battery cell group, and the battery cell terminals are connected to the FPC component; the number of the FPC components is the same as the number of battery cell rows.

[0013] As a further improvement of the present invention, the FPC assembly includes an FPC substrate, which extends along the length direction of the battery cell; an empty groove is opened in the middle of the FPC substrate, and the empty groove divides the FPC substrate into two parts, and one end of the two parts of the FPC substrate is connected and the other end is not connected.

[0014] As a further improvement of the present invention, conductive plates are arranged along the length direction of both sides of the FPC substrate, the conductive plates are connected to the FPC substrate through nickel sheets, and the conductive plates are in contact with the battery core terminals.

[0015] As a further improvement of the utility model, a plug is also arranged on the FPC substrate, and the plug is arranged at the connection between the two parts of the FPC substrate.

[0016] As a further improvement of the utility model, a tray is arranged between the battery cell group and the FPC assembly, and the tray includes a tray substrate, a fixing frame is arranged on the tray substrate, and the position of the fixing frame corresponds to the conductive plate; a plug slot is arranged at one end of the tray substrate, and the position of the plug slot corresponds to the plug.

[0017] As a further improvement of the present invention, end plates are arranged at both ends of the battery cell group, and the end plates include thermal insulation foam arranged close to the battery cells. A plate body is arranged on the side of the thermal insulation foam away from the battery cells, and a plurality of grooves are arranged on the upper part of the plate body, and fixing holes are arranged in the grooves; fixing protrusions are arranged on the sides of the plate body.

[0018] As a further improvement of the utility model, side panels are arranged on the sides of the battery cell group, and the side panels include a first side panel and a second side panel tightly attached to each other, and a plurality of through holes are provided on the second side panel; and connection holes corresponding to the fixing protrusions are provided at both ends of the second side panel.

[0019] As a further improvement of the utility model, a cover plate is arranged above the FPC assembly, the cover plate includes a plastic sheet and a mica sheet, and the plastic sheet and the mica sheet are composited together; an avoidance groove is provided on the plastic sheet, and the avoidance groove corresponds to the position of the battery cell explosion-proof valve; the mica sheet is located directly above the conductive plate, and the thickness of the plastic sheet and the mica sheet are both 0.3 to 0.5 mm.

[0020] 3. Beneficial effects

[0021] Compared with the existing known technologies, the technical solution provided by the utility model has the following significant effects:

[0022] The utility model provides a lightweight and compact battery module, which divides a maximum of 4 battery cells into one battery cell unit, and sets a heat insulation sheet between the battery cell units, thereby reducing the number of heat insulation sheets and making the battery module more compact. At the same time, multiple battery cell units form a battery cell row, and a heat dissipation plate is also set between the battery cell rows to separate multiple rows of battery cells, so that the breathing space of each battery cell unit can be aggregated to both sides of the heat insulation sheet, thereby making the breathing space of each battery cell not significantly reduced, and the cycle performance of the battery module not significantly reduced. While making the battery module more compact and improving the battery mass energy density, the battery performance does not decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded diagram of the battery module of the present utility model;

[0024] Figure 2 It is a schematic diagram of the hidden part structure of the battery module of the utility model;

[0025] Figure 3 It is a structural schematic diagram of a tray in a battery module of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the FPC component in the battery module of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the middle end plate of the battery module of the utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the side plate in the battery module of the utility model;

[0029] Figure 7 It is a structural schematic diagram of a cover plate in a battery module of the utility model.

[0030] Explanation of the numbers in the schematic diagram:

[0031] 1. Battery cell; 2. Heat insulation sheet; 3. Side panel; 31. First side panel; 32. Second side panel; 33. Through hole; 34. Connecting hole; 4. End panel; 41. Heat insulation foam; 42. Plate body; 43. Groove; 44. Fixing hole; 45. Fixing protrusion; 5. Tray; 51. Tray substrate; 52. Fixing frame; 53. Connector; 54. Plug slot; 55. Explosion-proof valve hole; 6. FPC assembly; 61. FPC substrate; 62. Conductive plate; 63. Nickel sheet; 64. Plug; 7. Cover plate; 71. Plastic sheet; 72 Mica sheet; 711 Avoidance slot; 8. Heat sink. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] Example

[0039] Combination Figure 1-Figure 6 A lightweight and compact battery module of this embodiment divides up to four battery cells 1 into one battery cell unit, and a heat insulating sheet 2 is arranged between the battery cell units, thereby reducing the number of heat insulating sheets 2 and making the battery module more compact. At the same time, multiple battery cell units form a battery cell row, and heat dissipation plates 8 are also arranged between the battery cell rows to separate multiple rows of battery cells 1, so that the breathing space of each battery cell unit can be aggregated to both sides of the heat insulating sheet 2, thereby making the breathing space of each battery cell 1 not significantly reduced, and the cycle performance of the battery module not significantly reduced. While making the battery module more compact and improving the battery mass energy density, the battery performance does not decrease. The specific introduction is as follows:

[0040] A lightweight and compact battery module of the present embodiment includes a plurality of battery cells 1. The large surfaces of the plurality of battery cells 1 are close to each other to form a battery cell row. At least two rows of battery cell rows are arranged in parallel to form a battery cell group. The battery cell rows are separated by a central heat dissipation plate 8. In the battery cell row, a plurality of battery cells 1 form a battery cell unit. Between the battery cell units, a heat insulation sheet 2 is arranged. The positions of the heat insulation sheets 2 in each row of battery cells are the same or different. In the present embodiment, the battery cell 1 includes two relatively large surfaces (hereinafter referred to as large surfaces), four small surfaces are arranged circumferentially along the two large surfaces, and the poles and explosion-proof valves of the battery cells 1 are all arranged on the small surfaces of the battery cells 1 facing upward. When the battery cells 1 of the present embodiment are grouped, all the poles and explosion-proof valves are facing upward. In the battery cell unit of the present embodiment, the number of battery cells 1 does not exceed 4. In the present embodiment, in order to facilitate the assembly of the battery module, every 4 battery cells 1 form a battery cell unit, and the positions of the heat insulation sheets 2 in each row of battery cells are the same, such as Figure 1 and Figure 2 As shown (the battery cell unit at one end of the figure has only 3 battery cells 1, which is to indicate that less than 4 battery cells 1 can be set in the battery cell unit). The number of battery cells 1 in the battery cell unit of this embodiment can also be 3, 2, or 1, and the number of battery cells 1 in each battery cell unit can be the same or different. The thermal insulation sheet 2 of this embodiment can also be in different positions. When the position of the thermal insulation sheet 2 is different, the number of battery cells 1 in each battery cell unit is different, and the thermal insulation sheet 2 is staggered. In this embodiment, in each battery cell unit, the battery cells 1 are arranged closely to the battery cells 1.

[0041] Combination Figure 4 In this embodiment, the terminals of all the cells 1 in the cell group face the same direction, and an FPC assembly 6 is arranged on the cell group, and the terminals of the cell 1 are connected to the FPC assembly 6; the number of FPC assemblies 6 is the same as the number of cell rows. In this embodiment, two rows of cell rows are arranged, and two FPC assemblies 6 are arranged accordingly, and the two FPC assemblies 6 are arranged side by side. Among them, the FPC assembly 6 includes an FPC substrate 61, and the FPC substrate 61 extends along the length direction of the cell; an empty groove is opened in the middle of the FPC substrate 61, and the empty groove divides the FPC substrate 61 into two parts, and one end of the two parts of the FPC substrate 61 is connected, and the other end is not connected, forming a "U"-shaped structure. Conductive plates 62 are arranged on both sides of the FPC substrate 61 along the length direction, and the conductive plates 62 are connected to the FPC substrate 61 through a nickel sheet 63, and the conductive plates 62 are in contact with the terminals of the cell 1. A plug 64 is also arranged on the FPC substrate 61, and the plug 64 is arranged at the connection between the two parts of the FPC substrate 61. In this embodiment, the conductive plate 62 is close to the pole of the battery cell 1, and the current of the battery cell 1 is conducted to the FPC substrate 61 through the nickel sheet 63. The two parts of the FPC substrate 61 respectively conduct the current generated by the battery cell 1 on this side to the plug 64 for output. In this embodiment, the setting of the empty slot can prevent the current from converging on both sides and causing excessive temperature, thereby avoiding damage to the FPC substrate 61 due to excessive temperature. At the same time, the opening of the empty slot can also reduce the quality of the FPC substrate 61 and reduce the overall quality of the battery module. In this embodiment, a cover plate 7 is also provided above the FPC assembly 6 to protect the FPC assembly 6.

[0042] Combination Figure 3In this embodiment, a tray 5 is arranged between the battery cell group and the FPC assembly 6. The tray 5 includes a tray substrate 51. A fixing frame 52 is arranged on the tray substrate 51. The fixing frame 52 corresponds to the position of the conductive plate 62. A plug slot 54 is arranged at one end of the tray substrate 51. The position of the plug slot 54 corresponds to the plug 64. In this embodiment, the tray substrate 51 is located at the empty slot position of the FPC substrate 61. The fixing frames 52 are arranged along both sides of the tray substrate 51. The conductive plate 62 is arranged in the fixing frame 52. An explosion-proof valve hole 55 is opened on the tray substrate 51 to make way for the explosion-proof valve on the battery cell 1. The plug slot 54 at the end of the tray substrate 51 is used to place the plug 64 to prevent the plug 64 from being damaged due to collision. A connector 53 is arranged in the plug slot 54 to connect the tray 5 with the end plate 4.

[0043] Combination Figure 5 , end plates 4 are arranged at both ends of the battery cell group, and the end plates 4 include heat-insulating foam 41 arranged close to the battery cell 1, and a plate body 42 is arranged on the side of the heat-insulating foam 41 away from the battery cell 1, and a plurality of grooves 43 are arranged on the upper part of the plate body 42, and fixing holes 44 are arranged in the grooves 43; fixing protrusions 45 are arranged on the side of the plate body 42. In this embodiment, four grooves 43 are arranged on the upper part of the plate body 42, and the grooves 43 near the two ends are used to fix the connecting piece 53, and the grooves 43 near the middle are used to fix the plug slot 54.

[0044] Combination Figure 6 In this embodiment, a side panel 3 is also provided on the side of the battery cell group, and the side panel 3 includes a first side panel 31 and a second side panel 32 that are tightly attached to each other, and a plurality of through holes 33 are provided on the second side panel 32; and connection holes 34 corresponding to the fixing protrusions 45 are provided at both ends of the second side panel 32. In this embodiment, the two end panels 4, the two side panels 3 and the tray 5 are connected to form a storage space for placing the battery cell 1, and the battery cell 1 is placed in the storage space. In this embodiment, the side panel 3 can achieve two layers of thermal insulation, one layer is the thermal insulation of the first side panel 31, and the other layer is the air filled in the through holes 33 on the second side panel 32, and the air layer is the second thermal insulation layer. Thus, double thermal insulation is achieved, and the thermal insulation effect is good.

[0045] Combination Figure 7 In this embodiment, a cover plate 7 is arranged above the battery cell group, including a plastic sheet 71 and a mica sheet 72 that are compounded together. In this embodiment, the mica sheet 72 and the plastic sheet 71 are fixed and compounded up and down by gluing to save space in the Z direction (height direction). The mica sheet 72 is arranged directly above the conductive plate 62 to ensure that the solid-liquid mixed conductor after the thermal runaway eruption of the battery cell will not cause a short circuit between the busbars, thereby avoiding secondary failure of the module caused by failure of the battery cell 1.

[0046] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A lightweight and compact battery module, characterized in that: It comprises a plurality of battery cells (1), wherein the large surfaces of the plurality of battery cells (1) are close to each other to form a battery cell row, and at least two rows of battery cell rows are arranged in parallel to form a battery cell group, and the battery cell rows are separated by a middle heat dissipation plate (8); In the battery cell row, a plurality of battery cells (1) form a battery cell unit, and heat insulating sheets (2) are arranged between the battery cell units; the positions of the heat insulating sheets (2) in each row of battery cells are the same or different.

2. A lightweight and compact battery module according to claim 1, characterized in that: In each of the battery cell units, the battery cells (1) are arranged closely together; in the battery cell unit, the number of the battery cells (1) does not exceed 4.

3. A lightweight and compact battery module according to claim 1, characterized in that: The terminals of all the cells (1) in the cell group face the same direction; an FPC component (6) is provided on the cell group; the terminals of the cells (1) are connected to the FPC component (6); and the number of the FPC components (6) is the same as the number of the cell rows.

4. A lightweight and compact battery module according to claim 3, characterized in that: The FPC assembly (6) comprises an FPC substrate (61), wherein the FPC substrate (61) extends along the length direction of the battery core; a hollow groove is provided in the middle of the FPC substrate (61), wherein the hollow groove divides the FPC substrate (61) into two parts, wherein one end of the two parts of the FPC substrate (61) are connected and the other end is not connected.

5. A lightweight and compact battery module according to claim 4, characterized in that: Conductive plates (62) are arranged along the length direction of both sides of the FPC substrate (61); the conductive plates (62) are connected to the FPC substrate (61) via a nickel sheet (63); and the conductive plates (62) are in contact with the terminals of the battery cell (1).

6. A lightweight and compact battery module according to claim 5, characterized in that: A plug (64) is also provided on the FPC substrate (61), and the plug (64) is provided at the connection between the two parts of the FPC substrate (61).

7. A lightweight and compact battery module according to claim 6, characterized in that: A tray (5) is arranged between the battery cell group and the FPC assembly (6), the tray (5) comprising a tray substrate (51), a fixing frame (52) is arranged on the tray substrate (51), and the position of the fixing frame (52) corresponds to the position of the conductive plate (62); a plug slot (54) is arranged at one end of the tray substrate (51), and the position of the plug slot (54) corresponds to the position of the plug (64).

8. A lightweight and compact battery module according to any one of claims 1 to 7, characterized in that: End plates (4) are arranged at both ends of the battery cell group, and the end plates (4) include a heat-insulating foam (41) arranged close to the battery cell (1). A plate body (42) is arranged on the side of the heat-insulating foam (41) away from the battery cell (1), and a plurality of grooves (43) are arranged on the upper part of the plate body (42), and fixing holes (44) are arranged in the grooves (43); and fixing protrusions (45) are arranged on the side of the plate body (42).

9. A lightweight and compact battery module according to claim 8, characterized in that: A side plate (3) is arranged on the side of the battery cell group, and the side plate (3) comprises a first side plate (31) and a second side plate (32) which are tightly attached to each other, and a plurality of through holes (33) are provided on the second side plate (32); and connection holes (34) corresponding to the fixing protrusions (45) are provided at both ends of the second side plate (32).

10. A lightweight and compact battery module according to claim 5, characterized in that: A cover plate (7) is arranged above the FPC assembly (6), the cover plate (7) comprising a plastic sheet (71) and a mica sheet (72), the plastic sheet (71) and the mica sheet (72) being composited together; an avoidance groove (711) is provided on the plastic sheet (71), the avoidance groove (711) corresponding to the position of the explosion-proof valve of the battery cell (1); the mica sheet (72) is located directly above the conductive plate (62), and the thickness of the plastic sheet (71) and the mica sheet (72) are both 0.3-0.5 mm.

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