Novel battery pack
By directly connecting the battery cells through tabs, eliminating the need for aluminum foil, and employing a flexible structure and ultrasonic welding process, the battery module structure is simplified, costs and process difficulty are reduced, and production efficiency is improved.
Patent Information
- Application Number
- CN202422998027.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Existing battery modules have complex structures, requiring multiple parts and aluminum bars for connection, which increases thermal resistance and cost, makes the process difficult, and results in high production line costs.
The battery cell is directly connected by tabs, simplifying the structure and eliminating the aluminum bar connection. Electrical connection is achieved through electrical contact between the tabs and the battery cell shell, and elastic structures or shape memory alloys are used to ensure stable connection. Combined with end components and ultrasonic welding process, production is simplified.
The battery module structure has been simplified, the number of parts has been reduced, production costs and process difficulty have been lowered, and production efficiency has been improved.
Smart Images
Figure CN223651605U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a novel battery pack. Background Technology
[0002] Currently, environmental and energy issues are driving the rapid development of the energy storage industry. Numerous new energy companies are engaged in fierce competition for energy storage modules. Therefore, the technologies involved in energy storage modules are constantly being optimized and upgraded.
[0003] In existing technologies, battery modules typically include a busbar and multiple battery cells. The cells are arranged sequentially, and steel strips are fitted onto each cell to secure it. The busbar covers each cell and has multiple aluminum plates attached to it, with each aluminum plate used to connect the cells. Traditional battery module structures are relatively complex, requiring numerous parts, including a busbar and multiple aluminum plates. These aluminum plates are welded to the cells, increasing thermal resistance and component costs. Therefore, existing battery module manufacturing processes are highly complex, resulting in high production line costs. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a novel battery pack.
[0005] The present invention adopts the following technical solution:
[0006] A new type of battery pack includes:
[0007] Multiple battery cells, each battery cell including a cell shell and a tab, the tab being connected to one side surface of the cell shell, the cell shell having a cavity, battery material being disposed within the cavity, one of the positive electrode material and the negative electrode material of the battery material being electrically connected to the cell shell, and the other being electrically connected to the tab, the battery cells being arranged sequentially, and in two adjacent battery cells, the tab of one cell and the cell shell of the other cell being in electrical contact;
[0008] The housing has a receiving cavity in which each of the battery cells is housed.
[0009] Optionally, the two sides of the cell shell along the thickness direction are a first surface and a second surface, respectively, and the tab covers the first surface. In two adjacent cells, the tab of one cell and the second surface of the other cell are in contact.
[0010] Optionally, the tabs are elastically deformable and are configured in a compressive deformation manner between two adjacent cell housings.
[0011] Optionally, the electrode tab is made of shape memory alloy;
[0012] Alternatively, the electrode tab and the battery cell housing are connected by an elastic structure;
[0013] Alternatively, the tab may include an elastic part and a metal sheet, the metal sheet being connected to the elastic part, and the elastic part being directly or indirectly connected to the battery cell casing.
[0014] Optionally, a temperature sensor and / or a voltage sensor may be provided on the tab.
[0015] Optionally, the top of the electrode extends out of the cell housing, and the temperature sensor and / or voltage sensor are disposed on the part of the electrode that extends out of the cell housing.
[0016] Optionally, the top of the electrode is provided with a notch, on which the temperature sensor and / or voltage sensor are disposed.
[0017] Optionally, it includes two end assemblies, each end assembly including an end plate and a conductive plate, the end plate being connected to one side of the conductive plate along the thickness direction;
[0018] Two end assemblies are respectively disposed at both ends of each cell. The conductive plate of one end assembly is electrically connected to the cell shell of the cell at the corresponding end, and the conductive plate of the other end assembly is electrically connected to the tab of the cell at the corresponding end.
[0019] The end plates of the two end assemblies are attached to the inner wall of the housing.
[0020] Optionally, the top of the conductive plate extends beyond the end plate, and the end of the conductive plate is bent to form a bent sheet portion.
[0021] Optionally, the end plate is a plastic part, the conductive plate is a metal part, and the end plate and the conductive plate are integrally connected by injection molding.
[0022] By adopting the above technical solution, this application has the following beneficial effects:
[0023] In this application, the battery pack does not require aluminum foil connections between individual cells; instead, the cells are directly connected through contact. This reduces the number of conductive plates and other components, simplifies the structure and process, and improves production efficiency.
[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description
[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:
[0026] Figure 1 A partial structural schematic diagram of the battery pack provided in an embodiment of this application is shown;
[0027] Figure 2 This paper shows a schematic diagram of the structure of the end component of the battery pack provided in an embodiment of this application;
[0028] Figure 3 A side view of the battery cell of the battery pack provided in an embodiment of this application is shown;
[0029] Figure 4 A perspective view of the battery cells of the battery pack provided in the embodiments of this application is shown.
[0030] In the diagram: 1. Battery cell; 11. Battery cell casing; 12. Electrode; 121. Notch; 2. End assembly; 21. End plate; 22. Conductive plate; 221. Bending plate; 3. Housing.
[0031] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.
[0033] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] See Figures 1 to 4 As shown in the figure, this application provides a novel battery pack, including: a plurality of battery cells 1 and a housing 3. Each battery cell 1 includes a cell shell 11 and a tab 12. The tab 12 is connected to one side surface of the cell shell 11. The cell shell 11 has a cavity, within which battery material is disposed. One of the positive electrode material and the negative electrode material of the battery material is electrically connected to the cell shell 11, and the other is electrically connected to the tab 12. The battery cells 1 are arranged sequentially. In two adjacent battery cells 1, the tab 12 of one cell is in electrical contact with the cell shell 11 of the other cell. The housing 3 has a receiving cavity, within which each battery cell 1 is received.
[0036] In this application, the cell shell 11 and the tab 12 of the battery cell constitute the two poles of the battery cell respectively. In the battery pack of this application, there is no need for aluminum bar connection between each battery cell 1. The battery cells 1 are directly contacted to achieve electrical connection, which reduces the number of parts such as conductive plate 22, simplifies the structure, simplifies the process, and improves production efficiency.
[0037] In some possible implementations, the battery cell shell 11 has a first surface and a second surface on both sides along its thickness direction, respectively. The tab 12 covers the first surface. In two adjacent battery cells 1, the tab 12 of one cell is in contact with the second surface of the other cell to achieve electrical connection. In this embodiment, the tab 12 is only fixedly connected to the battery cell shell 11, but the tab 12 is not electrically connected to the battery cell shell 11. The tab 12 can extend through the surface of the battery cell shell 11 to the interior via a conductor to electrically connect with the internal negative or positive electrode material. The tab 12 and the battery cell shell 11 are the two poles of the battery cell 1, respectively. The battery cell shell 11 and the tab 12 can be connected and fixed by bonding, welding, snap-fitting, or other arbitrary connection methods.
[0038] In some possible implementations, the tab 12 is elastically deformable, and the tab 12 is compressed and deformed between two adjacent cell housings 11. The tab 12 is elastic, which allows two adjacent cells 1 to fit tightly together, with the tab 12 of one cell 1 adhering to the cell housing 11 of the other, and the two cells 1 maintaining a good connection without breaking.
[0039] In some possible implementations, the tab 12 can be a shape memory alloy. Shape memory alloys will elastically deform when subjected to force and will return to their shape when the external force is removed. Shape memory alloys have good electrical conductivity, so they are suitable for use as tab 12.
[0040] In some possible implementations, when the tab 12 itself cannot elastically deform, the tab 12 and the cell shell 11 can be connected by an elastic structure. The elastic structure can be an elastic layer that bonds the tab 12 and the cell shell 11, or it can be other deformable and recoverable structural components. This application does not limit the specific structure of the elastic structure.
[0041] In some possible implementations, the tab 12 may include an elastic portion and a metal sheet, the metal sheet being connected to the elastic portion, which is directly or indirectly connected to the cell housing 11. The elastic portion may be a spring, a spring sheet, or other structure that is deformable under force and recovers its deformation upon removal of force. The metal sheet is used for electrical connection with the cell housing of adjacent cells.
[0042] In some possible implementations, a temperature sensor and / or a voltage sensor are provided on the tab 12. The temperature sensor can be used to acquire the temperature of the cell 1, and the voltage sensor can be used to detect the voltage of the cell 1.
[0043] In some possible implementations, the top of the tab 12 extends out of the cell housing 11, and the temperature sensor and / or voltage sensor are disposed on the portion of the tab 12 extending out of the cell housing 11. The portion of the tab 12 extending out of the cell housing 11 allows for convenient placement of the sensor, making sensor installation and removal easy.
[0044] The top of the tab 12 is provided with a notch 121, which is used to mount the temperature sensor and / or voltage sensor. The notch 121 can be a notch opened in the top of the tab 12, providing space for accommodating the sensor. One notch is provided on each side of the top of the same tab 12 along its width direction, which can conveniently accommodate the temperature sensor and the voltage sensor respectively.
[0045] In some possible implementations, the novel battery pack includes two end assemblies 2, each end assembly 2 comprising an end plate 21 and a conductive plate 22. The end plate 21 is connected to one side of the conductive plate 22 along its thickness direction. The two end assemblies 2 are respectively disposed at both ends of each battery cell 1. The conductive plate 22 of one end assembly 2 is electrically connected to the cell shell 11 of the corresponding end of the battery cell 1, and the conductive plate 22 of the other end assembly 2 is electrically connected to the tab 12 of the corresponding end of the battery cell 1. The end plates 21 of the two end assemblies 2 are attached to the inner wall of the housing 3. The two conductive plates 22 can be easily connected to lead out circuits via copper busbars.
[0046] The top of the conductive plate 22 extends out of the end plate 21, and the end of the conductive plate 22 is bent to form a bent piece 221, which facilitates connection and assembly with external circuits, such as copper busbars.
[0047] In some possible implementations, the end plate 21 is a plastic part, the conductive plate 22 is a metal part, and the end plate 21 and the conductive plate 22 are integrally formed and connected by injection molding. The end plate 21 and the conductive plate 22 can be pre-injected and formed as a single part, which facilitates subsequent assembly processes.
[0048] The embodiments of this application adjust the overall structure of the battery cell 1 to lay out the overall module assembly scheme and welding method, which can significantly reduce the overall process difficulty and reduce the production line cost.
[0049] The housing 3 can be an aluminum housing 3, and the aluminum housing 3 has at least one layer of thermally conductive structural adhesive on its bottom surface.
[0050] It should be noted that in this embodiment, a portion of the surface of the battery cell 1 may be covered with an insulating layer, thereby improving safety. For example, an insulating layer may be coated on the thick end face of the battery cell shell 11, without affecting the electrical connection between the tabs 12 and the battery cell shell 11 between adjacent battery cells 1.
[0051] The new energy battery pack casing of this application can be assembled using the following process:
[0052] First, stack the individual battery cells 1 and fix them in place using a fixture, keeping them all in a horizontal position. Then, weld the individual battery cells 1 together using ultrasonic welding. Next, weld the integrated end components 2 to the battery cells 1 at both ends of the stacked battery cells 1. Finally, make the insulated end plates 21 of the two end components 2 directly contact the inner wall of the housing 3.
[0053] In this embodiment, the module assembly is simple, requiring only ultrasonic welding to bond the battery cell 1 and the conductive plate 22 together. Then, the module is directly placed into the housing 3 using an extrusion fixture, with the housing 3 pre-applied with thermally conductive structural adhesive for fixation.
[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A novel battery pack, characterized in that, include: Multiple battery cells, each battery cell including a cell shell and a tab, the tab being connected to one side surface of the cell shell, the cell shell having a cavity, battery material being disposed within the cavity, one of the positive electrode material and the negative electrode material of the battery material being electrically connected to the cell shell, and the other being electrically connected to the tab, the battery cells being arranged sequentially, and in two adjacent battery cells, the tab of one cell and the cell shell of the other cell being in electrical contact; The housing has a receiving cavity in which each of the battery cells is housed.
2. The novel battery pack according to claim 1, characterized in that, The battery cell casing has a first surface and a second surface on both sides along the thickness direction. The tabs cover the first surface. In two adjacent battery cells, the tabs of one cell are in contact with the second surface of the other cell.
3. The novel battery pack according to claim 2, characterized in that, The tab is elastically deformable and is configured in a compressive deformation manner between two adjacent cell shells.
4. The novel battery pack according to claim 3, characterized in that, The electrode tabs are made of shape memory alloy; Alternatively, the electrode tab and the battery cell housing are connected by an elastic structure; Alternatively, the tab may include an elastic part and a metal sheet, the metal sheet being connected to the elastic part, and the elastic part being directly or indirectly connected to the battery cell casing.
5. The novel battery pack according to claim 1, characterized in that, A temperature sensor and / or a voltage sensor are provided on the electrode tab.
6. The novel battery pack according to claim 5, characterized in that, The top of the electrode extends out of the cell housing, and the temperature sensor and / or voltage sensor are provided on the part of the electrode that extends out of the cell housing.
7. The novel battery pack according to claim 6, characterized in that, The top of the electrode has a notch, on which the temperature sensor and / or voltage sensor are mounted.
8. The novel battery pack according to claim 1, characterized in that, It includes two end assemblies, each end assembly comprising an end plate and a conductive plate, the end plate being connected to one side of the conductive plate along the thickness direction; Two end assemblies are respectively disposed at both ends of each cell. The conductive plate of one end assembly is electrically connected to the cell shell of the cell at the corresponding end, and the conductive plate of the other end assembly is electrically connected to the tab of the cell at the corresponding end. The end plates of the two end assemblies are attached to the inner wall of the housing.
9. The novel battery pack according to claim 8, characterized in that, The top of the conductive plate extends out of the end plate, and the end of the conductive plate is bent to form a bent piece.
10. The novel battery pack according to claim 9, characterized in that, The end plate is made of plastic, the conductive plate is made of metal, and the end plate and the conductive plate are formed into an integral piece by injection molding.