Battery cell structure

Abstract

The utility model discloses a battery cell structure, which comprises a plurality of soft package battery cells and a shell for packaging the soft package battery cells, each soft package battery cell has a length direction and a thickness direction, at least two soft package battery cells are arranged along the length direction of the soft package battery cells to form battery cell groups, the number of the battery cell groups is two, and the soft package battery cells are arranged in the shell. And the plurality of LED chips are arranged along the thickness direction and are packaged in the shell. According to the utility model, the problem of slow heat dissipation caused by single-row superposition of at least three layers of battery cells in the prior art is solved, and the heat dissipation effect of the soft package battery cell structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cell structure. Background Art

[0002] In the process of forming a traditional soft-pack cell module, due to the fluctuation of the tolerance ranges of multiple battery parameters, the module size fluctuates. In addition, the soft-pack cell is relatively soft, and the aluminum-plastic film cannot play a good protective role. Compared with the traditional soft-pack cell forming, the structure of encapsulating the soft-pack cell in a shell provides better forming dimensional accuracy, safety, mechanical protection and thermal management capabilities.

[0003] At present, the design of encapsulating a soft-pack cell in a shell mostly stacks at least three layers of cells in a single row and then encapsulates them in the shell. The heat dissipation area of the cell in the middle part after stacking is small, and the overall heat dissipation effect of the cells after stacking is average. Summary of the Utility Model

[0004] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the utility model is to provide a cell structure, which solves the problem of slow heat dissipation caused by the single-row stacking of traditional at least three layers of soft-pack cells, and improves the heat dissipation effect of the soft-pack cells.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A cell structure includes a plurality of soft-pack cells and a shell encapsulating the soft-pack cells. The soft-pack cells have a length direction and a thickness direction. Along the length direction of the soft-pack cells, at least two of the soft-pack cells are arranged to form a cell group. There are two cell groups, and they are arranged along the thickness direction and encapsulated in the shell.

[0007] In one embodiment, each soft-pack cell has a surface in contact with the inner wall of the shell in its thickness direction.

[0008] In one embodiment, a fire extinguishing agent is injected into the shell, and the fire extinguishing agent fills the gap between the soft-pack cells and the shell.

[0009] In one embodiment, a foam is provided between the two cell groups.

[0010] In one embodiment, the cell group is coated with an insulating film.

[0011] In one embodiment, a fire extinguishing agent is injected into the shell, and the fire extinguishing agent fills the gap between the insulating film and the shell.

[0012] In one embodiment, the housing is a hollow cavity structure with an open end. The housing includes a cover plate, which is installed at the opening of the housing, and a plurality of the soft-pack battery cells are electrically connected to the cover plate.

[0013] In one embodiment, the battery cell structure further includes an explosion-proof valve, which is arranged on the cover plate.

[0014] In one embodiment, the soft-pack battery cell includes a tab; the cover plate includes a plurality of terminals, and one of the terminals is electrically connected to a plurality of the tabs.

[0015] In one embodiment, the cover plate further includes a plurality of adapter plates, and the tab and the terminal are electrically connected through the adapter plate.

[0016] The beneficial effects of the present utility model are as follows: A plurality of soft-pack battery cells are arranged in a row along their length direction to form a battery cell group. In the thickness direction of the soft-pack battery cell, only two battery cell groups are arranged side by side, so that each soft-pack battery cell encapsulated in the housing has one surface exposed in the thickness direction and does not contact other soft-pack battery cells, which increases the heat dissipation area of a single soft-pack battery cell. Compared with the traditional design of at least three layers of soft-pack battery cells stacked in a single row, the problem that the two surfaces of the soft-pack battery cells in the middle part are in contact with the adjacent soft-pack battery cells along the thickness direction, resulting in a small heat dissipation area and slow heat dissipation, is solved, and the heat dissipation effect of a single soft-pack battery cell is improved.

[0017] By arranging a cover plate on the housing and electrically connecting all the soft-pack battery cells inside the housing to the cover plate, it is realized that a plurality of battery cells share one cover plate for output, saving material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of the battery cell structure of the embodiment of the present utility model;

[0020] Figure 2 is Figure 1 the explosion diagram of

[0021] Figure 3 is Figure 1 the connection schematic diagram of the cover plate and other components in

[0022] In the figure: 1. housing; 11. cover plate; 200. battery cell group; 2. soft-pack battery cell; 21. tab; 3. explosion-proof valve; 4. terminal; 5. adapter plate; 6. insulating film; 7. foam. Specific embodiments

[0023] The following will describe in detail specific embodiments of the present utility model with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the description of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0024] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "arranged", "installed", "connected", etc. shall 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] Terms such as "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0027] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the listed elements, it may also include other elements not specifically listed.

[0028] The present utility model provides a battery cell structure, as Figure 1 and Figure 2As shown, it includes a plurality of pouch cells 2 and a housing 1 that encapsulates the pouch cells 2. The pouch cell 2 has a length direction L and a thickness direction D. Along the length direction L of the pouch cell 2, at least two pouch cells 2 are arranged to form a cell group 200. There are two cell groups 200, and they are arranged along the thickness direction D and encapsulated in the housing 1. In this embodiment, a plurality of pouch cells 2 are arranged along their length direction L to form a cell group 200. In the thickness direction D of the pouch cell 2, only two cell groups 200 are arranged, so that one surface of each pouch cell 2 is exposed in the thickness direction D and does not contact other pouch cells 2, which increases the heat dissipation area of a single pouch cell 2. Compared with the traditional design of at least three layers of pouch cells stacked in a single row, it solves the problem that both surfaces of the pouch cell 2 in the middle of the stacking direction are in contact with adjacent pouch cells 2, resulting in a small heat dissipation area and slow heat dissipation. It improves the heat dissipation effect of a single pouch cell 2, reduces the heat accumulation in the pouch cell 2, and improves the working stability of the pouch cell 2. Specifically, the areas of the two surfaces in the thickness direction D of the pouch cell 2 are large. When at least three layers of pouch cells 2 are stacked in a single row along the thickness direction D in the traditional way, both large-area surfaces of the pouch cell 2 in the middle part are in contact with the large-area surfaces of adjacent pouch cells 2, resulting in slow heat dissipation. In this embodiment, the pouch cells 2 are arranged along their length direction L, and two are arranged in the thickness direction D, avoiding the problem that both large-area surfaces of the pouch cell 2 in the middle are in contact with adjacent pouch cells 2, resulting in heat accumulation and slow heat dissipation, and improving the heat dissipation effect.

[0029] As an implementation manner, as Figure 1 and Figure 2 shown, one surface of each pouch cell 2 in its thickness direction D is in contact with the inner wall of the housing 1. Specifically, the cell group 200 may include two or three pouch cells 2 arranged along the length direction L of the pouch cell 2, and one or two cell groups 200 may be arranged along its thickness direction D. When only one cell group 200 is arranged, both surfaces of the pouch cell 2 in its thickness direction D can be in contact with the inner wall of the housing 1; when two cell groups 200 are arranged, one surface of the pouch cell 2 in its thickness direction D can be in contact with the inner wall of the housing 1; it ensures that the large-area surface of the pouch cell 2 can be in contact with the housing 1 to ensure a high heat dissipation effect. Preferably, the cell structure may include four pouch cells 2. Two pouch cells 2 are arranged along their length direction L to form a cell group 200, and two cell groups 200 are arranged along the thickness direction D of the pouch cell 2. Compared with the case where all four pouch cells 2 are arranged along the length direction L, it occupies less space, and compared with the case where all four pouch cells 2 are arranged along the thickness direction D, it has a better heat dissipation effect.

[0030] As an implementation manner, a fire extinguishing agent is injected into the housing 1, and the fire extinguishing agent fills the gap between the soft-pack battery cell 2 and the housing 1; when the soft-pack battery undergoes thermal runaway, the fire extinguishing agent encapsulated inside the housing 1 can directly extinguish the fire, which is convenient for fire extinguishing.

[0031] As an implementation manner, as Figure 2 shown, a foam material 7 is disposed between two battery cell groups 200. The foam material 7 can prevent the two adjacent soft-pack battery cells 2 from rubbing against each other in the thickness direction D, and has a good buffering effect. Among them, a whole large foam material 7 can be disposed between the two battery cell groups 200, or it can be divided into multiple foam materials 7, and a foam material 7 is disposed between the two soft-pack battery cells 2 arranged along the thickness direction D of the soft-pack battery cell 2.

[0032] As an implementation manner, as Figure 2 shown, the battery cell group 200 is coated with an insulating film 6. Specifically, first, a plurality of soft-pack battery cells 2 are stacked along the length direction L to form the battery cell group 200, and after the two battery cell groups 200 are arranged along the thickness direction D, they are wrapped together by the insulating film 6 and encapsulated in the housing 1, ensuring the insulation between the soft-pack battery cell 2 and the housing 1; of course, an insulating film 6 can also be wrapped around each soft-pack battery cell 2 first, and then the soft-pack battery cells 2 wrapped with the insulating film 6 are placed in the housing 1 one by one, and stacking is completed inside the housing 1.

[0033] As an implementation manner, a fire extinguishing agent is injected into the housing 1, and the fire extinguishing agent fills the gap between the insulating film 6 and the housing 1.

[0034] As an implementation manner, as Figure 1 and Figure 2 shown, the housing 1 is a hollow cavity structure with one end open, and the housing 1 includes a cover plate 11, and the cover plate 11 is installed at the opening of the housing 1; the soft-pack battery cell 2 is loaded into the hollow inner cavity of the housing 1 through the opening, and then the opening is sealed by the cover plate 11. Among them, the cover plate 11 is an integral structure, and each soft-pack battery cell 2 shares one cover plate 11, saving raw materials.

[0035] As an implementation manner, as Figures 1 to 3 shown, the battery cell structure further includes an explosion-proof valve 3, and the explosion-proof valve 3 is disposed on the cover plate 11. When gas is generated inside the battery cell structure, the explosion-proof valve 3 can control the pressure of the battery cell structure through its own pressure control device to keep it within a safe range, preventing accidents such as explosion and fire caused by the over-expansion of the battery cell structure; when gas with too high pressure is generated inside the battery cell structure, the explosion-proof valve 3 can automatically open to release the internal pressure, achieving the effect of protecting the battery cell structure.

[0036] As an implementation manner, as Figures 1 to 3As shown in the figure, the soft-pack battery cell 2 includes tab 21, and the cover plate 11 includes a plurality of terminals 4. In the thickness direction D of the soft-pack battery cell 2, one terminal 4 is electrically connected to a plurality of tabs 21. Specifically, the tabs 21 are arranged on the side of the soft-pack battery cell 2 close to the cover plate 11, and the terminals 4 are arranged on the side of the cover plate 11 away from the soft-pack battery cell 2. In the thickness direction D of the soft-pack battery cell 2, one terminal 4 is connected to the corresponding plurality of tabs 21.

[0037] As an implementation, as Figure 2 and Figure 3 shown in the figure, the cover plate 11 further includes a plurality of adapter plates 5, and the tabs 21 and the terminals 4 are electrically connected through the adapter plates 5. Specifically, a plurality of through holes (not shown) for installing the terminals 4 are formed on the cover plate 11. One end of the terminal 4 passes through the through hole (not shown) and is riveted and fixed to the cover plate 11; the adapter plate 5 is arranged on the side of the cover plate 11 close to the soft-pack battery cell 2. One end of the adapter plate 5 is welded to the end of the terminal 4 passing through the through hole (not shown), and the other end of the adapter plate 5 is welded to the tab 21; the welding method can be laser welding.

[0038] As an implementation, the cover plate 11 and the housing 1 are connected by welding; the welding method can be laser welding.

[0039] As an implementation, the housing 1 is made of an aluminum plate, and each soft-pack battery cell 2 ensures that there is a surface in the thickness direction D in contact with it, improving the heat dissipation effect.

[0040] Advantages of the present utility model:

[0041] (1) A plurality of soft-pack battery cells 2 are arranged along their length direction L to form a battery cell group 200. In the thickness direction D of the soft-pack battery cell 2, only two battery cell groups 200 are arranged, so that each soft-pack battery cell 2 encapsulated in the housing has a surface exposed in the thickness direction D and does not contact other soft-pack battery cells 2, improving the heat dissipation area of a single soft-pack battery cell 2. Compared with the traditional design of at least three layers of single-row soft-pack battery cells stacked, it solves the problem that the two surfaces of the soft-pack battery cell in the middle part in the thickness direction D are in contact with adjacent soft-pack battery cells, resulting in a small heat dissipation area and slow heat dissipation. The heat dissipation effect of a single soft-pack battery cell is improved, the heat accumulation in the soft-pack battery cell 2 is reduced, and the working stability of the soft-pack battery cell 2 is improved.

[0042] (2) By providing the cover plate 11 on the housing 1, the soft-pack battery cells 2 inside the housing 1 are all electrically connected to the cover plate 11, realizing the output of a plurality of soft-pack battery cells 2 sharing one cover plate 11, saving material costs.

[0043] The above are only the preferred embodiments of the present utility model, and do not impose any formal limitations on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications by using the above-disclosed technical content within the scope of the technical solution of the present utility model, which are equivalent embodiments of equivalent changes. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A battery cell structure, comprising a plurality of pouch cells (2) and a housing (1) encapsulating the pouch cells (2), characterized in that, The pouch cell (2) has a length direction (L) and a thickness direction (D). Along the length direction (L) of the pouch cell (2), at least two of the pouch cells (2) are arranged to form a cell group (200). There are two cell groups (200), which are arranged along the thickness direction (D) and encapsulated in the housing (1).

2. The cell structure according to claim 1, wherein Each of the pouch cells (2) has a surface in contact with the inner wall of the housing (1) in its thickness direction (D).

3. The battery cell structure according to claim 1, wherein, A foam (7) is provided between the two cell groups (200).

4. The cell structure according to claim 1, wherein, The cell group (200) is coated with an insulating film (6).

5. The battery cell structure according to claim 1, wherein, The housing (1) is a hollow cavity structure with one end open. The housing (1) includes a cover plate (11), and the cover plate (11) is installed at the opening of the housing (1). A plurality of the pouch cells (2) are all electrically connected to the cover plate (11).

6. The cell structure according to claim 5, wherein The cell structure further includes an explosion-proof valve (3), and the explosion-proof valve (3) is provided on the cover plate (11).

7. The cell structure according to claim 5, wherein The pouch cell (2) includes a plurality of tabs (21); the cover plate (11) includes a plurality of terminals (4). Among them, one terminal (4) is electrically connected to the plurality of tabs (21).

8. The battery cell structure according to claim 7, wherein, The cover plate (11) further includes a plurality of adapter plates (5), and the tabs (21) are electrically connected to the terminals (4) through the adapter plates (5).

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