Soft package battery module structure and battery pack

Abstract

The utility model relates to a soft package battery module structure and a battery pack. The soft package battery module structure comprises a plurality of unit groups and an integrated cover plate which are arranged in sequence, each unit group comprises two soft package batteries with tabs at two ends and a heat-conducting aluminum plate positioned between the two soft package batteries, the polarities of the two tabs at the same ends of the two soft package batteries are different, and the two tabs at the same ends of the two soft package batteries are electrically connected with the heat-conducting aluminum plate; the two tabs at the other ends of the two soft package batteries of each unit group and the heat conduction aluminum plate are electrically connected with the integrated cover plate; and the integrated cover plate is provided with a voltage acquisition device. The heat-conducting aluminum plate is connected with the soft package battery tabs in the unit group and is connected with the integrated cover plate, so that the heat-conducting aluminum plate is used as a voltage acquisition connecting conductor to be connected to a voltage acquisition device, the voltage of each soft package monomer can be acquired, a low-voltage wire harness is omitted, the stability of electric connection voltage acquisition is enhanced, and the device is simple and economical.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a soft-pack battery module structure and a battery pack. Background Art

[0002] Batteries are widely used in production and life, especially in the automotive industry. Commonly used batteries include lithium batteries, square batteries, soft-pack batteries, etc. Among them, soft-pack batteries are made by wrapping a layer of polymer film around a liquid ion battery. They have the advantages of good safety performance and low internal resistance. Specifically, in the event of a safety hazard, the soft-pack battery will only bulge and crack at most, and will not explode like steel-shell and aluminum-shell batteries. At the same time, the internal resistance of domestic soft-pack battery cells can be as low as 35mΩ, which greatly reduces the battery's self-consumption. Due to the above advantages of soft-pack batteries, they are used more by people than other types of batteries.

[0003] In order to meet the market demand for expanded capacity, the related technology uses multiple large-capacity soft-pack lithium-ion batteries with tabs on both ends to form modules and power-consuming devices. However, the soft-pack lithium-ion batteries with tabs on both ends are relatively large in size (especially in the length direction), and their component modules usually require very long wiring harnesses or very long FPCs (flexible circuit boards) to collect voltage, which is not only complicated to arrange but also very costly. Utility Model Content

[0004] Based on this, it is necessary to provide a soft-pack battery module structure and battery pack to address the technical problem that the current soft-pack lithium-ion batteries with tabs at both ends are relatively large in size (especially in the length direction), and their component modules usually require very long wiring harnesses or very long FPCs to collect voltage, which is not only complex to arrange but also very costly.

[0005] The utility model proposes a soft-pack battery module structure, which includes a plurality of unit groups and an integrated cover plate arranged in sequence; each unit group includes two soft-pack batteries with pole ears at both ends and a heat-conducting aluminum plate located between the two soft-pack batteries, the two pole ears at the same end of the two soft-pack batteries have different polarities and the two pole ears at the same end of the two soft-pack batteries are electrically connected to the heat-conducting aluminum plate; the two pole ears and the heat-conducting aluminum plate at the other ends of the two soft-pack batteries of each unit group are electrically connected to the integrated cover plate, and the integrated cover plate is provided with a voltage collection device.

[0006] The thermally conductive aluminum plate of the utility model is connected to the pole ear of the soft-pack battery in the unit group and to the integrated cover plate, so that the thermally conductive aluminum plate is connected to the voltage collection device as a voltage collection connection conductor, so that the voltage of each soft-pack monomer can be collected, the low-voltage wiring harness is omitted and the stability of the electrical connection voltage collection is enhanced, which is simple and economical; at the same time, a thermally conductive aluminum plate is arranged between two soft-pack batteries in each unit group, and the thermally conductive aluminum plate is in full contact with the large surface of the adjacent soft-pack batteries, so that the heat generated by the battery can be conducted outward, thereby reducing the temperature of the battery and improving the temperature uniformity of the entire module.

[0007] As a further improvement of the above solution of the utility model, a connector 1 is provided at one end of the heat-conducting aluminum plate, and the heat-conducting aluminum plate is electrically connected to the tab of the soft-pack battery through the connector 1.

[0008] By arranging a connector 1 at one end of the heat-conducting aluminum plate, the connection with the pole ear is facilitated, and the connector 1 and the heat-conducting aluminum plate can be integrally formed, which is convenient for processing.

[0009] As a further improvement of the above solution of the utility model, each unit group also includes a connection row 1, and the connection row 1 is electrically connected to the pole ear and the connection head 1 of the soft-pack battery.

[0010] Conventional soft-pack battery cells require aluminum plates to conduct heat to the bottom when they are made into modules. The utility model uses the aluminum plate as a "conductive harness" to collect voltage, replacing the harness. Connectors are provided at both ends of the heat-conducting aluminum plate, and the pole ears are connected to the connectors through a connecting row to replace the voltage collection harness, making the structure simpler and the assembly efficiency higher.

[0011] As a further improvement of the above solution of the utility model, a second connector is provided at the other end of the heat-conducting aluminum plate, and the second connector is electrically connected to the integrated cover plate.

[0012] By providing a second connector at one end of the heat-conducting aluminum plate to replace the connection between the voltage collection harness and the integrated cover plate, the structure becomes simpler and the assembly efficiency is higher. The second connector and the heat-conducting aluminum plate can be integrally formed for easy processing.

[0013] As a further improvement of the above scheme of the utility model, the soft-pack battery module structure also includes a plurality of connection rows 2; in any two adjacent unit groups of two soft-pack batteries close to each other, the two pole ears away from the connector 1 are welded to a connection row 2, and the connection row 2 is electrically connected to the integrated cover plate.

[0014] The second connection row is provided to replace the voltage collection harness to connect the pole ear with the integrated cover plate, so that the structure becomes simpler and the assembly efficiency is higher.

[0015] As a further improvement of the above solution of the utility model, a heat insulation pad is arranged between any two adjacent soft-pack batteries.

[0016] As a further improvement of the above scheme of the utility model, the soft-pack battery module structure also includes end plate 1 and end plate 2, which are respectively arranged at the two ends of multiple unit groups, and the integrated cover plate is arranged on the side of end plate 2 away from the unit group and fixed on end plate 2, the pole ear and connector 1 at one end of each soft-pack battery both penetrate end plate 1 and connection row 1 is arranged on the side of end plate 1 away from the unit group; the pole ear and connector 2 at the other end of each soft-pack battery both penetrate end plate 2 and connection row 2 is arranged on the side of end plate 2 away from the unit group.

[0017] The utility model provides a battery pack, which includes the soft-pack battery module structure as described above.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The thermally conductive aluminum plate of the utility model is connected to the pole ear of the soft-pack battery in the unit group and to the integrated cover plate, so that the thermally conductive aluminum plate is connected to the voltage collection device as a voltage collection connection conductor, so that the voltage of each soft-pack monomer can be collected, the low-voltage wiring harness is omitted and the stability of the electrical connection voltage collection is enhanced, which is simple and economical; at the same time, a thermally conductive aluminum plate is arranged between two soft-pack batteries in each unit group, and the thermally conductive aluminum plate is in full contact with the large surface of the adjacent soft-pack batteries, so that the heat generated by the battery can be conducted outward, thereby reducing the temperature of the battery and improving the temperature uniformity of the entire module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a soft-pack battery module structure proposed in an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Side view of

[0022] Figure 3 A partial exploded view of a soft-pack battery module structure proposed in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of a heat-conducting aluminum plate in a soft-pack battery module structure proposed in an embodiment of the utility model;

[0024] Figure 5 This is an assembly diagram of an integrated cover plate in a soft-pack battery module structure proposed in an embodiment of the utility model.

[0025] Figure numerals: 1. integrated cover plate; 2. soft-pack battery; 3. thermal conductive aluminum plate; 4. pole ear; 5. voltage collection device; 6. connector one; 7. connector row one; 8. connector two; 9. connector row two; 10. thermal insulation pad; 11. end plate one; 12. end plate two. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0029] Reference Figure 1-Figure 3 This embodiment provides a soft-pack battery module structure, including three cell groups and an integrated cover plate 1 , and may also include two connecting row 2s 9 , an end plate 1 11 and an end plate 2 12 .

[0030] The end plate 11 and the end plate 2 12 are arranged opposite to each other. Three unit groups are arranged between the end plate 11 and the end plate 2 12 and the three unit groups are arranged in sequence, and each unit group includes two soft-pack batteries 2 with tabs 4 at both ends, a heat-conducting aluminum plate 3 located between the two soft-pack batteries 2, and a connecting row 1 7. In this embodiment, the number of unit groups is three. Of course, in other embodiments, the number of unit groups can also be four, five, or other numbers.

[0031] In each unit group: the two pole ears 4 at the same end of the two soft-pack batteries 2 have different polarities and the two pole ears 4 of different polarities of each soft-pack battery 2 respectively penetrate the end plate 11 and the end plate 2 12; Figure 4The heat-conducting aluminum plate 3 is arranged between two soft-pack batteries 2, and the two ends of the heat-conducting aluminum plate 3 are respectively formed with a connector 1 6 and a connector 2 8, which respectively penetrate the end plate 1 11 and the end plate 2 12; the connecting row 1 7 is arranged on the side of the end plate 11 away from the unit group, and the connecting row 1 7 is welded to the connecting head 1 6, and the two pole ears 4 penetrating the end plate 1 11 are welded to the connecting row 1 7. In this embodiment, a heat insulation pad 10 is arranged between any two adjacent soft-pack batteries 2.

[0032] The two connecting rows 2 9 are both arranged on the side of the end plate 2 12 away from the cell group. The number of connecting rows 2 9 is related to the number of cell groups, and one connecting row 2 9 is arranged between any two adjacent cell groups. The pole ears 4 penetrating the end plate 2 12 in the two soft-pack batteries 2 close to each other in any two adjacent cell groups are welded to one connecting row 2 9.

[0033] The integrated cover plate 1 is arranged on the side of the end plate 12 away from the unit group and fixed on the end plate 12, and a voltage collection device 5 is arranged on the integrated cover plate 1. Figure 5 The integrated cover plate 1 is welded to the two connection rows 2 9 and the connection heads 2 8 of each heat-conducting aluminum plate 3 , and the tabs 4 of the two outermost soft-pack batteries 2 that penetrate the end plates 2 12 are directly welded to the integrated cover plate 1 .

[0034] Through the above structural arrangement, a heat-conducting aluminum plate 3 is arranged between two soft-pack batteries 2 in each unit group. The heat-conducting aluminum plate 3 is in full contact with the large surface of the adjacent soft-pack battery 2, and can conduct the heat generated by the battery to the outside, thereby reducing the temperature of the battery and improving the temperature uniformity of the entire module; at the same time, the heat-conducting aluminum plate 3 is connected to the pole ear 4 of the soft-pack battery 2 in the unit group and is connected to the integrated cover plate 1, so that the heat-conducting aluminum plate 3 is welded to the voltage collection device 5 as a voltage collection connection conductor, so that the voltage of each soft-pack monomer can be collected, the low-voltage wiring harness is omitted and the stability of the electrical connection voltage collection is enhanced, which is simple and economical.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A soft pack battery module structure, characterized in that: It comprises a plurality of sequentially arranged unit groups and an integrated cover plate (1); each unit group comprises two soft-pack batteries (2) with tabs at both ends and a heat-conducting aluminum plate (3) located between the two soft-pack batteries (2); two tabs (4) at the same end of the two soft-pack batteries (2) have different polarities and the two tabs (4) at the same end of the two soft-pack batteries (2) are both electrically connected to the heat-conducting aluminum plate (3); the two tabs (4) at the other ends of the two soft-pack batteries (2) in each unit group and the heat-conducting aluminum plate (3) are both electrically connected to the integrated cover plate (1); and the integrated cover plate (1) is provided with a voltage collection device (5).

2. The soft pack battery module structure according to claim 1, characterized in that: One end of the heat-conducting aluminum plate (3) is provided with a connector 1 (6), and the heat-conducting aluminum plate (3) is electrically connected to the tab (4) of the soft-pack battery (2) via the connector 1 (6).

3. The soft pack battery module structure according to claim 2, characterized in that: Each unit group also includes a connection row one (7), and the connection row one (7) is electrically connected to the pole ear (4) and the connection head one (6) of the soft-pack battery (2).

4. The soft pack battery module structure according to claim 1, characterized in that: The other end of the heat-conducting aluminum plate (3) is provided with a second connector (8), and the second connector (8) is electrically connected to the integrated cover plate (1).

5. The soft pack battery module structure according to claim 2, characterized in that: The soft-pack battery (2) module structure also includes a plurality of connection rows (9); in any two adjacent unit groups of two soft-pack batteries (2) close to each other, the two pole ears (4) away from the connection head (6) are welded to a connection row (9), and the connection row (9) is electrically connected to the integrated cover plate (1).

6. The soft pack battery module structure according to claim 1, characterized in that: A heat insulation pad (10) is provided between any two adjacent soft-pack batteries (2).

7. The soft pack battery module structure according to claim 5, characterized in that: The soft-pack battery (2) module structure further comprises an end plate one (11) and an end plate two (12), the end plate one (11) and the end plate two (12) being respectively arranged at the two ends of a plurality of unit groups, the integrated cover plate (1) being arranged on a side of the end plate two (12) away from the unit group and being fixed on the end plate two (12), the pole ear (4) and the connector one (6) at one end of each soft-pack battery (2) both pass through the end plate one (11), and the connection row one is arranged on a side of the end plate one away from the unit group; the pole ear (4) and the connector two (8) at the other end of each soft-pack battery (2) both pass through the end plate two (12), and the connection row two (9) is arranged on a side of the end plate two (12) away from the unit group.

8. A battery pack, characterized in that: It includes the soft-pack battery module structure as described in any one of claims 1 to 7.

Images