Battery assembly, battery pack and electric device

Abstract

The utility model belongs to the technical field of lithium ion batteries, and discloses a battery assembly, a battery pack and an electric device, and the battery assembly comprises a battery shell, a fixing piece, a pole piece and a sealing piece. The fixing piece is arranged on the battery shell, a connecting cavity is formed in the fixing piece, the interior of the battery shell is communicated with the outside through the connecting cavity, one end of the pole piece is arranged in the battery shell, the other end of the pole piece extends out of the outside through the connecting cavity, and the sealing piece is clamped between the pole piece and the inner wall of the connecting cavity. And the connecting cavity can be opened to balance internal and external pressure of the battery shell. The battery pack comprises a battery assembly. The power utilization device comprises a power utilization mechanism and a battery assembly, and the battery assembly is configured to supply power to the power utilization mechanism. Through the arrangement, the battery assembly disclosed by the utility model can reduce the occupied area of the pole piece, optimizes the spatial layout, and gives consideration to both compact structure and use safety.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a battery assembly, a battery pack and an electric device. Background Art

[0002] At present, in the lithium ion battery industry, steel sheet batteries have become the mainstream trend. However, due to the structure of the steel sheet battery itself, positive and negative electrode areas need to be led out outside the housing, and the positive and negative electrode areas need to occupy a certain area and thickness, which then limits the size of the steel sheet battery, making it difficult to layout the conventional pole structure and being unfavorable for improving the battery density. Moreover, the existing steel sheet battery structure is relatively compact, and relying solely on its steel shell cannot ensure that the battery does not undergo thermal runaway explosion, thus bringing many dangers to users. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a battery assembly, which can reduce the occupied area of the pole piece, optimize the space layout, and take into account both the structural compactness and the use safety.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A battery assembly, which comprises:

[0006] A battery housing;

[0007] A fixing member, arranged on the battery housing, and a connecting cavity is arranged inside the fixing member, and the inside of the battery housing communicates with the outside through the connecting cavity;

[0008] A pole piece, one end of the pole piece is placed inside the battery housing, and the other end extends out to the outside through the connecting cavity;

[0009] A sealing member, clamped between the pole piece and the inner wall of the connecting cavity, and when the sealing member is heated, it can open the connecting cavity to balance the internal and external pressures of the battery housing.

[0010] Optionally, the battery housing includes an upper housing and a back plate, and the upper housing covers the back plate to form a receiving space.

[0011] Optionally, a liquid injection hole is opened on the upper housing or the back plate, and the receiving space communicates with the outside through the liquid injection hole.

[0012] Optionally, a core is arranged inside the battery housing, and the pole piece and the tab of the core are of an integrally formed structure.

[0013] Optionally, the pole piece is in a needle-shaped structure.

[0014] Optionally, one end of the terminal member is provided with a welding plate, and the seal is disposed between the welding plate and the inner wall of the battery housing.

[0015] Optionally, the welding plate and the terminal member are integrally formed into a T-shaped structure.

[0016] Optionally, the seal includes resin or plastic.

[0017] The purpose of the present utility model is to provide a battery pack, which can reduce the occupied area of the terminal member, optimize the space layout, and take into account both structural compactness and use safety.

[0018] To achieve this purpose, the present utility model adopts the following technical solutions:

[0019] A battery pack, which includes the battery assembly as described above.

[0020] The purpose of the present utility model is to provide an electrical device, which can reduce the occupied area of the terminal member, optimize the space layout, and take into account both structural compactness and use safety.

[0021] To achieve this purpose, the present utility model adopts the following technical solutions:

[0022] An electrical device, which includes:

[0023] An electric mechanism;

[0024] The battery assembly as described above, and the battery assembly is configured to supply power to the electric mechanism;

[0025] Or, the battery pack as described above, and the battery pack is configured to supply power to the electric mechanism.

[0026] The beneficial effects of the present utility model:

[0027] The present utility model provides a battery assembly, a battery pack and an electrical device. The battery assembly includes a battery housing, a fixing member, a pole member and a sealing member. The fixing member is arranged on the battery housing, and a connection cavity is provided inside the fixing member. The inside of the battery housing communicates with the outside through the connection cavity. One end of the pole member is placed inside the battery housing, and the other end extends to the outside through the connection cavity, so that the pole member can pass through the battery housing without additionally occupying external area, making the structure of the battery assembly more compact, facilitating a more flexible space layout, and improving the overall energy density and design freedom of the battery. Moreover, by providing the fixing member, the connection strength and stability between the pole and the battery housing can be improved, and displacement and shaking of the pole member can be avoided. The sealing member is clamped between the pole member and the inner wall of the connection cavity. When the pressure inside the battery housing rises sharply due to abnormal conditions such as overheating or short circuit, the sealing member is heated and deformed to open the connection cavity to balance the internal and external pressures of the battery housing, reducing the risk of thermal runaway, improving the safety of use, and preventing battery explosion caused by excessive pressure. The battery pack includes the battery assembly. The electrical device includes an electrical mechanism, the battery assembly or the battery pack, and the battery assembly or the battery pack is configured to supply power to the electrical mechanism. Through the above settings, the battery assembly of the present application can reduce the occupied area of the pole member, optimize the space layout, and take into account both structural compactness and use safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the battery assembly provided by an embodiment of the present utility model Figure 1 ;

[0029] Figure 2 is an installation schematic diagram of the battery assembly provided by an embodiment of the present utility model Figure 1 ;

[0030] Figure 3 is an installation schematic diagram of the battery assembly provided by an embodiment of the present utility model Figure 2 ;

[0031] Figure 4 is a schematic diagram of the battery assembly provided by an embodiment of the present utility model Figure 2 ;

[0032] Figure 5 is an installation schematic diagram of the battery assembly provided by an embodiment of the present utility model Figure 3 .

[0033] In the figure:

[0034] 1. Battery housing; 11. Upper housing; 12. Back plate; 13. Accommodation space; 14. Liquid injection hole; 2. Fixing member; 21. Connection cavity; 3. Pole member; 4. Sealing member; 5. Welding plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0039] As Figures 1-5 shown, this embodiment provides a battery assembly, which includes a battery housing 1, a fixing member 2, a pole member 3, and a sealing member 4. The fixing member 2 is disposed on the battery housing 1. A connection cavity 21 is provided inside the fixing member 2. The inside of the battery housing 1 communicates with the outside through the connection cavity 21. One end of the pole member 3 is placed inside the battery housing 1, and the other end extends to the outside through the connection cavity 21. The sealing member 4 is clamped between the pole member 3 and the inner wall of the connection cavity 21. When the sealing member 4 is heated, it can open the connection cavity 21 to balance the internal and external pressures of the battery housing 1.

[0040] In this embodiment, the fixing member 2 is arranged on the battery housing 1, and a connecting cavity 21 is arranged inside the fixing member 2. The inside of the battery housing 1 is connected to the outside through the connecting cavity 21. One end of the pole member 3 is placed inside the battery housing 1, and the other end extends to the outside through the connecting cavity 21, so that the pole member 3 can pass through the battery housing 1 without occupying additional external area, making the battery assembly structure more compact, facilitating a more flexible spatial layout, and improving the overall energy density and design freedom of the battery. Moreover, by setting the fixing member 2, the connection strength and stability between the pole and the battery housing 1 can be improved, and the displacement and shaking of the pole member 3 can be avoided. The seal 4 is sandwiched between the pole member 3 and the inner wall of the connecting cavity 21. When the pressure inside the battery housing 1 rises sharply due to abnormal conditions such as overheating or short circuit, the seal 4 is deformed by heat and can open the connecting cavity 21 to balance the internal and external pressures of the battery housing 1, reducing the risk of thermal runaway, improving the safety of use, and preventing the battery from exploding due to excessive pressure. Through the above arrangement, the battery assembly of this embodiment can reduce the area occupied by the pole member 3, optimize the space layout, and take into account both the compact structure and the safety of use.

[0041] The following explains the specific structure of the battery module:

[0042] Specifically, Figures 1-3 As shown, the battery housing 1 includes an upper housing 11 and a back plate 12. The upper housing 11 is covered on the back plate 12 to form an accommodating space 13. Such a configuration makes the assembly process of the battery assembly more flexible and convenient. During assembly, the battery assembly and other internal components can be installed on the back plate 12 first, and then the upper housing 11 is covered to complete the packaging.

[0043] More specifically, if Figure 2 As shown, in this embodiment, the upper shell 11 includes a cover plate and a side plate, the cover plate is extended along an arc, the side plate is extended along the circumference of the cover plate, and is surrounded by the cover plate to form a groove, and one end of the side plate away from the cover plate is connected to the back plate 12, thereby forming the internal space of the battery shell 1. In other embodiments, the overall shape of the battery shell 1 includes but is not limited to a parallelepiped, a special shape, etc., which will not be described in detail here.

[0044] More specifically, Figures 1-3 As shown, a liquid injection hole 14 is provided on the upper shell 11 or the back plate 12, and the accommodating space 13 is connected to the outside through the liquid injection hole 14. The liquid injection hole 14 is used to inject electrolyte into the accommodating space 13, without complicated disassembly or destruction of the battery structure, thereby simplifying the production process and improving production efficiency. After the liquid injection is completed, laser welding is used to seal the liquid injection port with a sealing nail to prevent leakage of the electrolyte.

[0045] Specifically, Figures 1-3As shown, a core body is provided inside the battery housing 1. The pole piece 3 and the tab of the core body are of an integrally formed structure, which reduces the steps of separately processing and assembling the tab and the pole piece 3, thereby improving the efficiency of the production line. It can be understood that the core body includes one or more of a wound core and a stacked core, which can be specifically determined according to the manufacturing process of the battery, and those skilled in the art are clear about the specific structure of the core body, so no further description and limitation will be made here.

[0046] Specifically, as Figures 1-3 shown, in this embodiment, the pole piece 3 has a needle-shaped structure, which can minimize the space occupied inside and outside the battery housing 1, and is beneficial to improving the energy density of the battery and the compactness of the structure. It can be understood that the needle-shaped structure is similar to a filamentous or rod-shaped structure, that is, the axial dimension of the pole piece 3 is much larger than the radial dimension. In other embodiments, the pole piece 3 has a columnar structure for easy processing. It can be understood that the specific shape of the pole piece 3 is not limited as long as the above functions can be achieved.

[0047] Specifically, as Figure 4 and Figure 5 shown, in some other embodiments, a welding plate 5 is provided at one end of the pole piece 3. The welding plate 5 is used to connect the core body inside the battery housing 1, and can provide a large welding area for the core body to improve the convenience of connection and assembly of the core body. The seal 4 is arranged between the welding plate 5 and the inner wall of the battery housing 1 to ensure the connection strength and sealing effect between the welding plate 5 and the battery housing 1. At the same time, by providing the seal 4, an insulating effect can be achieved to ensure that no short-circuit problem occurs between components.

[0048] More specifically, as Figure 4 and Figure 5 shown, in some other embodiments, the welding plate 5 and the pole piece 3 are of an integrally formed T-shaped structure. During assembly, the operator first connects the T-shaped structure to the core body, and the core body is connected to the current collector, and then the battery housing 1 is assembled. Through the above integrally formed process, the assembly links between various components are reduced, and the production efficiency is improved. At the same time, the integrated molding also reduces the performance problems caused by assembly errors and improves the overall quality of the product. Moreover, through the T-shaped structure between the welding plate 5 and the pole piece 3, the overall structure has good mechanical properties.

[0049] Specifically, in this embodiment, the seal 4 comprises resin or plastic, which not only ensures the sealing between the terminal member 3 and the battery housing 1, and between the welding plate 5 and the battery housing 1, avoiding the leakage of the electrolyte, but also ensures the insulation between the components to prevent dangers such as short circuits. In addition, since resin or plastic can undergo controllable deformation at high temperatures, by generating cracks, the interior of the battery housing 1 can communicate with the outside through the cracks in the seal 4, and then the high-pressure gas or vapor inside the battery housing 1 can be quickly released to the external environment, which helps to reduce the pressure inside the battery and prevent the battery from exploding or rupturing due to excessive internal pressure.

[0050] In other embodiments, the seal 4 is made of insulating materials such as glass or TPE (thermoplastic elastomer) at different temperatures to ensure the insulation and sealing between the components. In addition, the roller groove process can also be used to seal between the terminal member 3 and the battery housing 1, and between the welding plate 5 and the battery housing 1.

[0051] In addition, in other embodiments, in order to prevent the battery from exploding due to excessive internal pressure, devices such as explosion-proof valves can also be used. When the battery undergoes thermal runaway, the explosion-proof valve can be set to ensure that the connection cavity 21 is opened to balance the internal and external pressures of the battery housing 1, reducing the risk of thermal runaway and improving the safety of use, preventing the battery from exploding due to excessive pressure. It should be noted that those skilled in the art are familiar with the specific principle of the explosion-proof valve and will not be elaborated here.

[0052] This embodiment also provides a battery pack, which includes battery components. The battery components are designed as standardized and modular units, facilitating flexible arrangement within the battery pack. Such a setting not only improves the production efficiency, but also can reduce the occupied area of the terminal member 3, optimize the space layout, and take into account both structural compactness and use safety.

[0053] This embodiment also provides an electrical device, which includes an electrical mechanism, a battery component or a battery pack. The battery component or the battery pack is configured to supply power to the electrical mechanism. By using the battery component or the battery pack as the main energy source of the electrical device, a stable and reliable power supply can be provided to meet the working requirements of the electrical mechanism. Among them, the electrical mechanism includes but is not limited to: electric vehicles, smart phones, tablet computers, and impact screwdrivers. Through the above settings, the occupied area of the terminal member 3 can be reduced, the space layout can be optimized, and both structural compactness and use safety can be taken into account.

[0054] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A battery assembly, characterized in that include: Battery housing (1); A fixing member (2) is arranged on the battery housing (1), a connecting cavity (21) is provided inside the fixing member (2), and the interior of the battery housing (1) is connected to the outside through the connecting cavity (21); A pole piece (3), one end of the pole piece (3) being placed inside the battery housing (1), and the other end of the pole piece (3) extending to the outside through the connecting cavity (21); The sealing member (4) is sandwiched between the pole member (3) and the inner wall of the connecting cavity (21); when the sealing member (4) is heated, it can open the connecting cavity (21) to balance the internal and external pressures of the battery housing (1).

2. The battery assembly according to claim 1, characterized in that: The battery housing (1) comprises an upper housing (11) and a back plate (12); the upper housing (11) is covered on the back plate (12) to form an accommodating space (13).

3. The battery assembly according to claim 2, characterized in that: The upper shell (11) or the back plate (12) is provided with a liquid injection hole (14), and the accommodating space (13) is connected to the outside through the liquid injection hole (14).

4. The battery assembly according to claim 1, characterized in that: A core body is provided inside the battery housing (1), and the pole column member (3) and the pole lug of the core body are an integrally formed structure.

5. The battery assembly according to claim 1, characterized in that: The pole piece (3) is in a needle-shaped structure.

6. The battery assembly according to claim 1, characterized in that: A welding plate (5) is provided at one end of the pole piece (3), and the sealing piece (4) is arranged between the welding plate (5) and the inner wall of the battery housing (1).

7. The battery assembly according to claim 6, characterized in that: The welding plate (5) and the pole piece (3) are an integrally formed T-shaped structure.

8. The battery assembly according to claim 1, characterized in that: The sealing member (4) comprises resin or plastic.

9. A battery pack, characterized in that: A battery assembly comprising any one of claims 1 to 8.

10. An electrical device, characterized in that: include: Electricity users; The battery assembly according to any one of claims 1 to 8, wherein the battery assembly is configured to supply power to the power-consuming mechanism; Alternatively, the battery pack as described in claim 9 is configured to supply power to the power-consuming mechanism.

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