Soft package battery and soft package battery module

Abstract

The utility model relates to the technical field of batteries, and provides a soft package battery and a soft package battery module, the soft package battery comprises: a soft package battery body, the two ends of the soft package battery body comprise tabs; the top cover is a hard metal piece, one side, facing the tabs, of the top cover is correspondingly welded with the tabs, the other side of the top cover is used for being connected with an aluminum row, and the top cover covers one end of the soft package battery body and partially coincides with the end part of the soft package battery body. According to the technical scheme, the integration rate of the soft package battery is improved, the occupied volume of a single soft package battery body can be reduced, and after a plurality of soft package battery bodies form a module, the occupied internal space of the module shell is reduced, so that the internal space utilization rate of the module shell is improved; meanwhile, according to the technical scheme, the structural strength of the soft package battery can be improved, and pack integration of the soft package battery is facilitated.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a pouch battery and a pouch battery module. Background Technology

[0002] Currently, when assembling pouch power batteries, electrode brackets are typically installed on the tab side, and aluminum busbars are further welded to the tab bracket ends to connect the cells in series and parallel. Since the tab bracket has a certain thickness, the tabs need to pass through the tab bracket and aluminum busbar for welding. For example, prior art: 202121656112.4 A standard module structure for energy storage pouch batteries discloses a structure comprising: a plurality of cells 9 stacked together; a tab bracket 2 fixed above the plurality of cells 9; each cell 9 includes a cell tab 8, which passes through the tab bracket 2 and is bent and welded to the surface of the tab bracket 2.

[0003] When assembling the module, space needs to be reserved for installing assembly accessories such as connecting wires and sampling lines. Because the tab bracket has a certain thickness, when it is set at one end of multiple soft-pack power batteries and grouped with multiple soft-pack power batteries, it will occupy a certain space, resulting in the limited space inside the module shell not being fully utilized. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a soft-pack battery and a soft-pack battery module, which improves the integration rate of the soft-pack battery, reduces the volume occupied by a single soft-pack battery, and reduces the space occupied inside the module casing after multiple soft-pack batteries are assembled into a module, thereby improving the space utilization rate inside the module casing.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a pouch battery, comprising: a pouch battery body, wherein the pouch battery body has tabs at both ends; and a top cover, which is a hard metal part, wherein the top cover is welded to the tabs on one side and connected to an aluminum busbar on the other side, and the top cover is disposed on one end of the pouch battery body and partially overlaps with the end of the pouch battery body.

[0007] In one embodiment, the top cover includes a bottom wall and a side wall connected to the bottom wall, the bottom wall and the side wall forming a cavity that covers one end of the soft-pack battery body.

[0008] In one embodiment, a gap is provided between the sidewall and the soft-pack battery body, and the gap is filled with thermally conductive adhesive.

[0009] As an implementation form, the bottom wall is further provided with a conductive terminal at one end of the tab, and the conductive terminal is welded with the tab.

[0010] As an implementation form, the bottom wall is further provided with a protruding conductive column at a side away from the tab.

[0011] As an implementation form, the bottom wall is provided with a through hole, and a part of the conductive column passes through the through hole and is connected with the conductive terminal.

[0012] As an implementation form, the conductive terminal, the conductive column and the top cover are insulated.

[0013] As an implementation form, the top cover is provided with two top covers respectively arranged at two ends of the soft package battery body.

[0014] In a second aspect, the application provides a soft package battery module, which comprises the soft package battery provided in the first aspect, and a plurality of the soft package batteries are stacked.

[0015] As an implementation form, the soft package battery module further comprises a plurality of aluminum rows, and the aluminum rows are connected with adjacent conductive columns.

[0016] The technical scheme of the application has the following beneficial effects:

[0017] The two ends of the soft package battery body comprise two tabs, i.e. a positive tab and a negative tab; the soft package battery further comprises a top cover, which is a hard metal piece and can be connected and conductive with the tab; a side of the top cover facing the tab is welded with the tab in correspondence, and covers one end of the soft package battery body to protect the tab; the top cover is partially overlapped with the end of the soft package battery body, thereby improving the structural strength of the end of the soft package battery. After the top cover is welded with the tab, the top cover and the soft package battery body are integrated, thereby improving the integration rate; and the tab support is cancelled, the tab does not need to pass through a tab support with a certain thickness to be connected with the aluminum row, and the top cover can be directly connected with the aluminum row, thereby reducing the volume of a single soft package battery, and improving the space utilization rate of the limited module shell when a plurality of soft package batteries form a module. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 The structural schematic diagram of the soft package battery provided in the embodiments of the application;

[0020] Figure 2 This is a schematic diagram of the exploded structure of a pouch battery provided in an embodiment of this application;

[0021] Figure 3 A schematic diagram showing the overlapping structure of the top cover and the soft-pack battery body in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of the soft-pack battery module provided in the embodiments of this application.

[0023] Icons: 1-Pack battery body; 11-Taper; 2-Top cover; 21-Bottom wall; 22-Side wall; 23-Conductive terminal; 24-Conductive post. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1 to 3 As shown, in a first aspect, embodiments of this application provide a pouch battery, including a pouch battery body 1. The pouch battery body 1 has two tabs 11 at both ends, namely a positive tab and a negative tab. The pouch battery also includes a top cover 2, which is a rigid metal component capable of connecting and conducting electricity with the tabs 11. The side of the top cover 2 facing the tabs 11 is welded to the tabs 11 and covers one end of the pouch battery body 1, protecting the tabs 11. The top cover 2 partially overlaps with the end of the pouch battery body 1, improving the structural strength of the pouch battery end. After the top cover 2 is welded to the tabs 11, the top cover 2 and the pouch battery body 1 become integrated, improving the integration rate. Furthermore, the tab support is eliminated, and the tabs 11 do not need to pass through a tab support of a certain thickness to connect with the aluminum busbar, thereby reducing the volume of a single pouch battery. When multiple pouch batteries are assembled into a module, the space utilization rate within the limited module casing is also improved.

[0027] Optionally, after the top cover 2 is welded to the tab 11 and before it is placed over the pouch battery body 1, the tab 11 can be compressed to reduce the volume of the pouch battery.

[0028] Optionally, the pouch battery body 1 can be a pouch battery cell as in the prior art.

[0029] Optionally, the top cover 2 can be made of aluminum or steel.

[0030] In the prior art, the temperature at the position of the tab is high, the tab support is generally a plastic part, the heat conduction effect is poor, and the heat dissipation effect at the tab is poor; and the top cover 2 is directly welded with the tab 11, the tab support is cancelled, and the top cover 2 is also a metal part, and after contacting with the liquid cooling plate, the heat dissipation effect of the tab 11 can be improved.

[0031] In the prior art, due to the insufficient structural strength of the soft-pack power battery and the group error caused by the battery consistency problem, it is difficult to imitate the hard-shell battery integrated scheme without a module form, and the complex and inefficient integrated scheme makes the soft-pack power battery system lose the advantage of high specific energy of a single battery. In the embodiment of the present application, the top cover 2 is arranged at both ends of the single soft-pack battery body 1, and the top cover 2 is a hard metal part, so that the structural strength of the integrated soft-pack battery is improved, the consistency of the soft-pack battery is improved, and the soft-pack battery is suitable for the assembly mode without a module form.

[0032] In the prior art, unlike the square cell battery, the soft-pack battery does not have a pressure relief valve, and the soft-pack battery packaged by the aluminum plastic film has uncertainty in the position of pressure relief when thermal runaway occurs. The position of the tab seal of the soft-pack battery has relatively weak sealing strength, and the probability of high-temperature flue gas breaking through the position of the tab seal is higher. There are a large number of gaps between the tabs of the batteries in the soft-pack battery module. When thermal runaway occurs, the high-temperature flue gas diffuses and conducts heat in the gaps between the tabs, causing the occurrence of heat spread. At the same time, the high-temperature flue gas in the thermal runaway contains a large amount of electrode particulate matter, which has the possibility of further causing short circuit and arc sparking at the battery tab position. Based on this, the protection of the battery tab side is the key to the thermal safety protection of the soft-pack battery. In the embodiment of the present application, the top cover 2 is arranged at the end of the soft-pack battery body 1. On the one hand, it can prevent high-temperature flue gas from being sprayed out from the position of the top cover 2; on the other hand, it can protect the tab 11.

[0033] As shown in FIG. 1, as an embodiment, the top cover 2 includes a bottom wall 21 and a side wall 22 connected with the bottom wall 21, and the bottom wall 21 and the side wall 22 form a cavity cover arranged at one end of the soft-pack battery body 1, thereby facilitating connection with the soft-pack battery body 1. Figure 1 Optionally, the length of the side wall 22 can be longer, so that when the top cover 2 covers one end of the soft-pack battery body 1, part of the side wall 22 can coincide with the corresponding side surface of the soft-pack battery body 1, thereby improving the structural strength of the end of the soft-pack battery, and facilitating connection with the corresponding side surface of the soft-pack battery body 1.

[0034] Optionally, the side wall 22 is provided with four.

[0035]

[0036] ​As an implementation form, a gap is arranged between the side wall 22 and the soft package battery body 1, and the gap is filled with a heat-conducting glue, so as to strengthen the structural strength of the soft package battery, and facilitate heat conduction and heat dissipation of the tab area.

[0037] Optionally, the area of the bottom wall 21 is greater than the cross section of the soft package battery body 1, so that when the top cover 2 covers the end of the soft package battery body 1, the side wall 22 can have a gap corresponding to the side of the soft package battery body 1.

[0038] As shown in Figure 2 As an implementation form, the bottom wall 21 is also provided with a conductive terminal 23 at one end of the tab 11, and the conductive terminal 23 is convenient for welding with the tab 11.

[0039] Optionally, the conductive terminal 23 can be arranged protruding from the bottom wall 21, so that the tab 11 is more convenient for welding with the conductive terminal 23.

[0040] Optionally, since the tab 11 has a certain length, in the welding process, the end of the tab 11 can be attached to the position of the conductive terminal 23, and a laser or ultrasonic welding method is used to realize welding. After welding, the tab 11 can be compressed by the top cover 2, so that the tab 11 is in the chamber, and the volume of the soft package battery is also reduced. Of course, in addition, the side wall 22 of the top cover 2 can also be arranged to be provided with three first, leaving a part of the area for welding, and after the welding is completed, the remaining one side wall 22 is welded to the top cover 2, that is, welded with the bottom wall 21 and the other two side walls 22.

[0041] As shown in Figure 1 As an implementation form, the bottom wall 21 is also provided with a protruding conductive column 24 away from the tab 11, and the conductive column 24 is used to connect with the aluminum row. When a plurality of soft package batteries are stacked, the connection mode of series and parallel connection of the module can be realized through the connection of the aluminum row and the conductive column 24.

[0042] Optionally, the conductive column 24 can be welded with the aluminum row.

[0043] As an implementation form, the bottom wall 21 is provided with a through hole, and the local conductive column 24 passes through the through hole and is connected with the conductive terminal 23, so that the conductive column 24 is directly connected with the conductive terminal 23.

[0044] Of course, the local conductive terminal 23 can also pass through the through hole and be directly connected with the conductive column 24.

[0045] As an implementation form, the conductive terminal 23 and the conductive column 24 are insulated from the top cover 2. The top cover 2 can be attached with an insulating film. When a plurality of soft package batteries are stacked, the two adjacent top covers 2 can be insulated after being contacted, and the conduction between the two adjacent soft package batteries is prevented.

[0046] Optionally, an insulating sleeve can be further arranged at the position of the through hole. The insulating sleeve is located on both sides of the bottom wall 21 and includes two abutting portions. The two abutting portions are abutted with both sides of the bottom wall 21, and the two abutting portions are connected by a connecting portion. The connecting portion is a hollow structure. The conductive terminal 23 can partially pass through the connecting portion and be welded with the conductive column 24. Of course, the conductive column 24 can also partially pass through the connecting portion and be welded with the conductive terminal 23. The areas of the two abutting portions can be greater than those of the conductive terminal 23 and the conductive column 24, respectively.

[0047] As an implementation form, the top cover 2 is provided with two top covers, which are respectively arranged at two ends of the soft package battery body 1. In this way, the structural strength of the soft package battery can be improved, the connection mode of the soft package battery is changed to a square shell, the assembly of a subsequent battery pack is simplified, and the operation is convenient. To some extent, the position of the tab 11 on the soft package battery body 1 is protected, and the service life of the soft package battery body 1 is improved.

[0048] As shown in Figure 4 The second aspect, the embodiment of the application provides a soft package battery module, which comprises the soft package battery provided in the first aspect, and a plurality of soft package batteries are stacked. The stacking arrangement can maximize the use of the space inside the battery module, reduce the waste of invalid space, and thus improve the energy density.

[0049] As an implementation form, the soft package battery module further comprises a plurality of aluminum rows. The aluminum rows are connected with the adjacent conductive columns 24, so that the plurality of soft package batteries are connected in series and parallel.

[0050] The above only describes the embodiments of the application and is not used to limit the protection scope of the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

[0051] The above only describes the embodiments of the application and is not used to limit the protection scope of the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

[0052] It is to be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a combination of two or more components. Additionally, the terms "comprise," "comprises," and "comprising," or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, unless otherwise indicated herein, the terms "first," "second," "third," etc., are used herein merely as labels, and are not intended to impose ordinal import.

Claims

1. A pouch battery, characterized by, The utility model relates to a soft package battery module, comprising: a soft package battery body, both ends of the soft package battery body comprising a tab; a top cover, which is a hard metal piece, one side of the top cover corresponding to the tab is welded with the tab, and the other side is used for being connected with an aluminum bar, the top cover is arranged on one end of the soft package battery body and partially overlaps the end of the soft package battery body.

2. The pouch battery of claim 1, wherein, The top cover comprises a bottom wall and a side wall connected with the bottom wall, and the bottom wall and the side wall form a cavity which is arranged on one end of the soft package battery body. 3.The pouch battery of claim 2, wherein, A gap is arranged between the side wall and the soft package battery body, and the gap is filled with a heat-conducting adhesive. 4.The pouch battery according to claim 2 or 3, characterized by, One end of the bottom wall towards the tab is further provided with a conductive terminal, and the conductive terminal is welded with the tab.

5. The pouch battery of claim 4, wherein, The side away from the tab of the bottom wall is further provided with a protruding conductive column. 6.The pouch battery of claim 5, wherein, The bottom wall is provided with a through hole, and part of the conductive column passes through the through hole and is connected with the conductive terminal.

7. The pouch battery of claim 6, wherein, The conductive terminal, the conductive column and the top cover are insulated. 8.The pouch battery of any one of claims 1 to 3, wherein, The top cover is provided with two, respectively arranged on both ends of the soft package battery body.

9. A pouch battery module, characterized by, The utility model relates to a soft package battery module, comprising:

10. The pouch battery module of claim 9, wherein, a soft package battery body, both ends of the soft package battery body comprising a tab; a top cover, which is a hard metal piece, one side of the top cover corresponding to the tab is welded with the tab, and the other side is used for being connected with an aluminum bar, the top cover is arranged on one end of the soft package battery body and partially overlaps the end of the soft package battery body. The top cover comprises a bottom wall and a side wall connected with the bottom wall, and the bottom wall and the side wall form a cavity which is arranged on one end of the soft package battery body. A gap is arranged between the side wall and the soft package battery body, and the gap is filled with a heat-conducting adhesive. One end of the bottom wall towards the tab is further provided with a conductive terminal, and the conductive terminal is welded with the tab. The side away from the tab of the bottom wall is further provided with a protruding conductive column. The bottom wall is provided with a through hole, and part of the conductive column passes through the through hole and is connected with the conductive terminal. The conductive terminal, the conductive column and the top cover are insulated. The top cover is provided with two, respectively arranged on both ends of the soft package battery body. The utility model relates to a soft package battery module, comprising: a soft package battery body, both ends of the soft package battery body comprising a tab; a top cover, which is a hard metal piece, one side of the top cover corresponding to the tab is welded with the tab, and the other side is used for being connected with an aluminum bar, the top cover is arranged on one end of the soft package battery body and partially overlaps the end of the soft package battery body. The top cover comprises a bottom wall and a side wall connected with the bottom wall, and the bottom wall and the side wall form a cavity which is arranged on one end of the soft package battery body. A gap is arranged between the side wall and the soft package battery body, and the gap is filled with a heat-conducting adhesive. One end of the bottom wall towards the tab is further provided with a conductive terminal

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