Multi-roll-core combined battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a multi-roll-core combined battery cell, which comprises a shell, a positive pole and a negative pole are respectively arranged at two opposite ends of the shell, a positive collector plate and a negative collector plate are respectively and electrically connected to positions, corresponding to the positive pole and the negative pole, in the shell, and the positive collector plate and the negative collector plate are respectively provided with a positive electrode and a negative electrode. A plurality of roll cores are arranged between the positive electrode collector plate and the negative electrode collector plate, and each roll core simultaneously abuts against the positive electrode collector plate and the negative electrode collector plate and is electrically connected to the positive electrode collector plate and the negative electrode collector plate. The method has the effect of reducing the manufacturing difficulty of the large battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electric core composed of multiple wound cores. Background Art

[0002] An electric core refers to the core part of a battery, also known as a battery cell or battery element. It is the basic unit of a battery, responsible for storing and releasing electrical energy. Among them, a cylindrical electric core usually includes a housing, a wound core, and positive and negative electrode posts. The structure of the wound core is to stack the positive electrode material, negative electrode material, and separator together in sequence and wind them into a cylindrical shape. The separator between the positive and negative electrode posts plays a role in isolating the positive and negative electrodes to prevent direct contact from causing a short circuit. The electrolyte is injected into the wound core to fill the gap between the positive and negative electrode posts to provide a channel for ion transmission, and then the charging and discharging process is carried out through the positive and negative posts of the electric core.

[0003] In the prior art, the common form of a cylindrical electric core is a single wound core electric core. This design can simplify the battery assembly process and production cost. However, for a large single wound core electric core, the pole piece required in the winding process of a single large wound core is too long, and it is easy to deviate during the winding process and is not easy to control, which will increase the manufacturing cost and difficulty of the large single wound core electric core and urgently needs to be solved. Summary of the Utility Model

[0004] Aiming at the above deficiencies in the prior art, the present application provides an electric core composed of multiple wound cores, aiming to complete the charging and discharging process by using the combination of multiple wound cores and an internal current collector plate to replace the single wound core method, thereby reducing the manufacturing difficulty of large electric cores and solving the problem of too long pole pieces during the winding of large wound cores.

[0005] The above object of the present application is achieved through the following technical solutions:

[0006] A housing, a positive electrode post and a negative electrode post are respectively arranged at opposite ends of the housing, a positive current collector plate and a negative current collector plate are respectively electrically connected at positions corresponding to the positive electrode post and the negative electrode post inside the housing, and a plurality of wound cores are arranged between the positive current collector plate and the negative current collector plate. Each wound core is simultaneously in contact with the positive current collector plate and the negative current collector plate and is electrically connected to the positive current collector plate and the negative current collector plate.

[0007] By adopting the above technical solutions, the positive current collector plate and the negative current collector plate are provided, which can play a role in connecting multiple wound cores and the positive and negative electrode posts, enabling multiple wound cores to form multiple parallel current paths inside the electric core to complete the charging and discharging process. Compared with a single large wound core, the winding process of a small wound core is simple, the required pole piece length is short, and its manufacturing process is easy to control. The method of combining multiple wound cores can solve the problem of large winding process difficulty of large wound cores.

[0008] In a preferred example, the present application can be further configured such that a first insulating sleeve is sleeved outside each of the core rolls.

[0009] By adopting the above technical solution, the first insulating sleeve plays a role of isolation between the core rolls, avoiding direct contact between the core rolls and causing short circuits, and can improve the safety of the battery cell.

[0010] In a preferred example, the present application can be further configured such that a second insulating sleeve is coaxially arranged inside the outer shell, and accommodating grooves for placing the positive current collector plate or the negative current collector plate are respectively arranged at opposite ends of the inner side wall of the second insulating sleeve.

[0011] By adopting the above technical solution, the second insulating sleeve plays a role of isolation between the positive current collector plate and the outer shell, and between the negative current collector plate and the outer shell, avoiding direct contact and causing short circuits, and can improve the safety of the battery cell. And by providing the accommodating grooves, installation positions can be provided for the positive current collector plate and the negative current collector plate, enabling them to stably contact the core roll and the pole post respectively, and forming a stable current path.

[0012] In a preferred example, the present application can be further configured such that the outer shell is provided with ventilation holes.

[0013] By adopting the above technical solution, the ventilation holes are provided to balance the internal and external pressures of the battery cell, reduce the safety risks caused by pressure accumulation, and provide a ventilation channel for the heat dissipation of multiple core rolls, enabling air to flow and contact the surface of the core roll, thereby promoting the conduction and dissipation of heat.

[0014] In a preferred example, the present application can be further configured such that a first holder is arranged inside the outer shell, and the inside of the outer shell is divided into several limiting areas by the first holder, and each limiting area is used for a single core roll to pass through.

[0015] By adopting the above technical solution, the first holder can provide mechanical support for each core roll separately and fix the position of the core roll, avoiding the movement or deformation of the core roll during the use of the battery cell, maintaining the stability and consistency of the internal structure of the battery cell, reducing the short circuit risk, and at the same time preventing direct contact and short circuits between the core rolls, ensuring the normal operation of the battery cell.

[0016] In a preferred example, the present application can be further configured such that a plurality of second holders are arranged inside the outer shell, adjacent second holders are in contact with each other, the second holders are sleeved on the core roll and are adapted to the core roll, and the second holders correspond to the core rolls one by one.

[0017] By adopting the above technical solution, a second cage is provided, which can individually provide mechanical support for each core and fix the position of the core, and can make adjacent second cages abut and support each other by arranging the second cages throughout the interior of the housing, so as to prevent the cores from shaking and becoming loose during the use of the battery cell, maintain the stability and consistency of the internal structure of the battery cell, and contribute to the formation of the interface between the positive and negative electrode posts.

[0018] In a preferred example of the present application, it can be further configured that the housing is in a prismatic shape or a cylindrical shape.

[0019] In a preferred example of the present application, it can be further configured that the interior of the housing stores electrolyte.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. By providing a positive current collector plate and a negative current collector plate, it can connect multiple cores and the positive and negative electrode posts, enabling multiple cores to form multiple parallel current paths inside the battery cell to complete the charging and discharging process. Compared with a single large core, the winding process of small cores is simple, the required length of the electrode sheet is short, and its manufacturing process is easy to control. The use of a combination of multiple cores can solve the problem of the large winding process difficulty of large cores.

[0022] 2. The first insulating sleeve plays a role in isolating between the cores, preventing direct contact between the cores and causing a short circuit, and improving the safety of the battery cell.

[0023] 3. The second insulating sleeve plays a role in isolating between the positive current collector plate and the housing, and between the negative current collector plate and the housing, preventing direct contact and causing a short circuit, improving the safety of the battery cell, and by providing a receiving groove, it can provide an installation position for the positive current collector plate and the negative current collector plate, enabling them to stably contact the core and the electrode post respectively, forming a stable current path. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of a battery cell with a multi-core combination in an embodiment of the present application;

[0025] Figure 2 is a schematic cross-sectional view of a battery cell with a multi-core combination in an embodiment of the present application;

[0026] Figure 3 is another schematic cross-sectional view of a battery cell with a multi-core combination in an embodiment of the present application;

[0027] Figure 4 is a schematic cross-sectional view of a battery cell with a multi-core combination in another embodiment of the present application;

[0028] Figure 5 It is a schematic cross-sectional view of a battery cell with multiple core combinations in another embodiment of the present application;

[0029] Figure 6 It is a schematic cross-sectional view of a battery cell with multiple core combinations in another embodiment of the present application.

[0030] Reference numerals: 1, outer shell; 2, positive electrode terminal; 3, negative electrode terminal; 4, positive current collector plate; 5, negative current collector plate; 6, core; 7, first insulating sleeve; 8, second insulating sleeve; 9, receiving groove; 10, ventilation hole; 11, first holder; 12, second holder. Detailed implementation manners

[0031] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. Various details of the embodiments of the present application are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0032] It should be noted that terms such as "first" and "second" in the present invention are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present disclosure described herein can be implemented in an order different from those illustrated or described herein. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure.

[0033] In addition, the term "and / or" herein merely describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after, unless otherwise specified.

[0034] Next, a battery cell with multiple core combinations of the present application will be described with reference to the accompanying drawings.

[0035] As Figure 1 shown, the battery cell with multiple core combinations includes an outer shell 1. A positive electrode terminal 2 and a negative electrode terminal 3 are respectively provided at opposite ends of the outer shell 1. A positive current collector plate 4 and a negative current collector plate 5 are electrically connected to the positions corresponding to the positive electrode terminal 2 and the negative electrode terminal 3 inside the outer shell 1. A plurality of cores 6 are provided between the positive current collector plate 4 and the negative current collector plate 5. Each core 6 abuts against both the positive current collector plate 4 and the negative current collector plate 5 and is electrically connected to both the positive current collector plate 4 and the negative current collector plate 5;

[0036] Specifically, the outer shell 1 is made of a metal material. Metal shells 1 with excellent mechanical strength and corrosion resistance, such as aluminum shells 1 or stainless-steel shells 1, can be selected to protect the internal structure of the battery cell. An electrolyte (not shown in the figure) is stored inside the shell to provide an ion transmission channel for the positive and negative electrode posts. Both the positive current collector plate 4 and the negative current collector plate 5 are made of carbon materials with good electrical conductivity, such as copper foil or aluminum foil. Generally, the positive current collector plate 4 requires better electrical conductivity, and the negative current collector plate 5 requires better chemical stability. The positive current collector plate 4 and the negative current collector plate 5 play a role of providing a connection platform for multiple wound cores 6 inside the battery cell, enabling them to conduct electricity stably to the electrode posts. The wound core 6 is wound into a cylindrical shape to provide a larger surface area and capacity. Both ends of the wound core 6 are respectively abutted against the positive current collector plate 4 and the negative current collector plate 5 to complete the electrical connection with the positive and negative electrode posts 3. By providing the positive current collector plate 4 and the negative current collector plate 5, the connection between multiple wound cores 6 and the positive and negative electrode posts 3 can be achieved, enabling multiple wound cores 6 to form multiple parallel current paths inside the battery cell to complete the charging and discharging process. Compared with a single large wound core 6, the winding process of the small wound core 6 is simple, the required length of the electrode sheet is short, and its manufacturing process is easy to control, thus solving the problem of the large winding process difficulty of the large wound core 6.

[0037] Furthermore, a first insulating sleeve 7 is sleeved outside each wound core 6. The first insulating sleeve 7 plays a role of isolation between the wound cores 6, preventing direct contact between the wound cores 6 and causing a short circuit, and improving the safety of the battery cell.

[0038] In addition, a second insulating sleeve 8 is coaxially arranged inside the outer shell 1. Accommodating grooves 9 for placing the positive current collector plate 4 or the negative current collector plate 5 are respectively extended at opposite ends of the inner side wall of the second insulating sleeve 8. By providing the accommodating grooves 9, installation positions can be provided for the positive current collector plate 4 and the negative current collector plate 5, enabling them to stably contact the wound core 6 and the electrode post respectively to form a stable current path. Moreover, the second insulating sleeve 8 plays a role of isolation between the positive current collector plate 4 and the outer shell 1, and between the negative current collector plate 5 and the outer shell 1, preventing direct contact and causing a short circuit, and improving the safety of the battery cell.

[0039] In addition, the outer shell 1 is provided with ventilation holes 10. By providing the ventilation holes 10, the pressure inside and outside the battery cell can be balanced, reducing the safety risk caused by pressure accumulation, and providing a ventilation channel for the heat dissipation of multiple wound cores 6, enabling air to flow and contact the surface of the wound core 6, thereby promoting the conduction and dissipation of heat.

[0040] In one embodiment, a first cage 11 is provided inside the housing 1. The inside of the housing 1 is divided into several limiting areas by the first cage 11, and each limiting area is used for a single core 6 to pass through. Among them, the shape of the first cage 11 can be selected as honeycomb radial, so that a honeycomb structure is formed between the first cage 11 and the inside of the housing 1. The first cage 11 can be made of plastic, rubber or metal material coated with insulating paint. By providing the first cage 11, mechanical support can be provided for each core 6 separately and the position of the core 6 can be fixed, avoiding the movement or deformation of the core 6 during the use of the battery cell, maintaining the stability and consistency of the internal structure of the battery cell, reducing the short-circuit risk, and at the same time preventing the direct contact and short circuit between the cores 6, ensuring the normal operation of the battery cell.

[0041] In another embodiment, several second cages 12 are provided inside the housing 1. The adjacent second cages 12 are in contact with each other. The second cage 12 is sleeved on the core 6 and is adapted to the core 6. The second cages 12 correspond to the cores 6 one by one. The second cage 12 can be made of plastic, rubber or metal material coated with insulating paint. By providing the second cage 12, mechanical support can be provided for each core 6 separately and the position of the core 6 can be fixed, and by arranging the second cages 12 all over the inside of the housing 1, the adjacent second cages 12 can be in contact and support each other, so as to avoid the core 6 from shaking and becoming loose during the use of the battery cell, maintaining the stability and consistency of the internal structure of the battery cell, and contributing to the formation of the interface between the positive and negative terminals 3.

[0042] In addition, the shape of the housing 1 is prismatic or cylindrical. By adopting a prismatic or cylindrical housing 1, the working conditions of most battery cells on the market can be adapted. Among them, the battery cells with a prismatic housing 1 have a small gap between each other when assembling the battery module, which can improve the utilization rate of the module installation space and increase the volume energy density.

[0043] The above specific embodiments do not constitute a limitation to the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell with multiple winding cores, characterized in that: include: A shell (1), wherein opposite ends of the shell (1) are respectively provided with a positive electrode column (2) and a negative electrode column (3), and positions inside the shell (1) corresponding to the positive electrode column (2) and the negative electrode column (3) are respectively electrically connected with a positive electrode collector plate (4) and a negative electrode collector plate (5), and a plurality of winding cores (6) are arranged between the positive electrode collector plate (4) and the negative electrode collector plate (5), and each of the winding cores (6) is simultaneously in contact with the positive electrode collector plate (4) and the negative electrode collector plate (5) and is electrically connected to the positive electrode collector plate (4) and the negative electrode collector plate (5).

2. A multi-winding core battery cell as claimed in claim 1, characterized in that: The outer side of each winding core (6) is sleeved with a first insulating sleeve (7).

3. A multi-core battery cell as claimed in claim 1, characterized in that: A second insulating sleeve (8) is coaxially arranged inside the housing (1), and receiving grooves (9) for accommodating the positive electrode current collecting plate (4) or the negative electrode current collecting plate (5) are extended from opposite ends of the inner side wall of the second insulating sleeve (8).

4. A multi-core battery cell as claimed in claim 1, characterized in that: The housing (1) is provided with a vent hole (10).

5. The multi-winding core battery cell according to claim 1, characterized in that: A first retaining frame (11) is arranged inside the outer shell (1), and the interior of the outer shell (1) is divided into a plurality of limiting areas by the first retaining frame (11), and each limiting area is used for a single winding core (6) to pass through.

6. A multi-winding core battery cell as claimed in claim 1, characterized in that: A plurality of second retaining frames (12) are arranged inside the outer shell (1), and adjacent second retaining frames (12) are in contact with each other. The second retaining frames (12) are sleeved on the winding core (6) and matched with the winding core (6), and the second retaining frames (12) correspond to the winding core (6) one by one.

7. A multi-winding core battery cell as claimed in claim 1, characterized in that: The shape of the housing (1) is prism-shaped or cylindrical.

8. The multi-winding core battery cell according to claim 1, characterized in that: The shell (1) contains electrolyte.

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