Novel battery structure and battery pack

Abstract

The utility model discloses a novel battery structure and a battery pack, and relates to the technical field of battery structures. The novel battery structure comprises a plurality of naked battery cells, a plurality of lead wires and a plurality of lead wires, the plurality of positive electrode tabs are respectively connected with one ends of the plurality of naked battery cells; the plurality of negative electrode tabs are respectively arranged on the naked battery core at one end far away from the positive electrode tab; the first adapter plate is connected with one end of each of the plurality of naked battery cells and is embedded with the plurality of positive electrode tabs respectively; and the second adapter sheet is connected with the other ends of the plurality of naked battery cells and is respectively embedded with the plurality of negative electrode tabs. The utility model solves the problems that not only is the structural complexity of the battery pack increased, but also the overall cost is increased due to the existing battery pack grouping mode, and the existing square large battery cell structure is poorer in thermal safety performance and non-uniform in roll cell heat.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, and particularly relates to a novel battery structure and a battery pack. Background Art

[0002] As secondary batteries widely used at present, lithium-ion batteries and sodium-ion batteries mainly consist of a positive electrode material, a negative electrode material, a separator, an electrolyte and a casing. According to different packaging forms, batteries can generally be divided into types such as square aluminum cases, square soft packs, cylindrical aluminum cases and cylindrical steel cases. The working voltage of each single battery is generally between 2 and 5 volts.

[0003] Conventional cylindrical batteries usually contain a wound core (naked battery cell) inside. This structure limits the capacity and energy density of the battery to a certain extent. The size limitation of the wound core results in a small capacity of a single cylindrical battery. Therefore, in practical applications, multiple single batteries need to be connected in parallel or in series to form a battery pack (PACK) to meet the power requirements of devices.

[0004] However, this way of forming a battery pack not only increases the structural complexity of the battery pack, but also raises the overall cost. Moreover, the existing square large battery cell structure has problems such as poor thermal safety performance and uneven heat of the wound core. For the above problems that have emerged, no effective solutions have been proposed yet. Summary of the Utility Model

[0005] Utility Model Objective: To provide a novel battery structure and a battery pack to at least solve one of the problems existing in the above prior art.

[0006] Technical Solution: A novel battery structure includes: a plurality of naked battery cells; a plurality of positive electrode tabs respectively connected to one end of the plurality of naked battery cells; a plurality of negative electrode tabs respectively arranged on the naked battery cells at one end far from the positive electrode tabs; a first connecting piece connected to one end of the plurality of naked battery cells and respectively fitted with the plurality of positive electrode tabs; and a second connecting piece connected to the other end of the plurality of naked battery cells and respectively fitted with the plurality of negative electrode tabs; wherein, the plurality of naked battery cells are arranged in a tangent array in pairs, and both ends are electrically connected through the first connecting piece and the second connecting piece respectively to form the main framework of the novel battery structure.

[0007] Preferably, the plurality of naked battery cells are arranged in a staggered manner and are in a honeycomb shape.

[0008] Preferably, the number of the plurality of naked battery cells is 2 - 100.

[0009] Preferably, the plurality of bare battery cells include: a first bare battery cell and a second bare battery cell that are tangentially arranged in two phases, and the second bare battery cell is tangentially arranged with the two first bare battery cells respectively to form a minimum array unit, and the minimum array units are arranged in an array and filled in a staggered mirror image manner according to a preset direction.

[0010] Preferably, the first connecting piece and the second connecting piece are respectively provided with hollow areas that match the positions of the plurality of positive electrode tabs and the plurality of negative electrode tabs.

[0011] Preferably, the hollow area is arc-shaped.

[0012] Preferably, the first connecting piece and the second connecting piece are further respectively provided with heat dissipation holes, and the heat dissipation holes are located at the gaps formed by the array of the plurality of bare battery cells.

[0013] Preferably, the first connecting piece includes: an extension part arranged on one side of the first connecting piece and extending along the length direction of the bare battery cell, and a first welding part is horizontally arranged at the bottom of the extension part.

[0014] Preferably, a second welding part is oppositely arranged on the side of the second connecting piece away from the first connecting piece, and the second welding part is arranged parallel to the first welding part.

[0015] To achieve the above object, according to another aspect of the present application, a battery pack is further provided.

[0016] The battery pack according to the present application includes the novel battery structure as described above;

[0017] It further includes: a hollow battery cell housing for placing the novel battery structure, a battery cell cover plate is provided on the top of the battery cell housing, a positive electrode post and a negative electrode post are respectively arranged on the battery cell cover plate, and a plurality of limiting parts are arranged on the inner wall of the battery cell cover plate.

[0018] Beneficial effects: In the embodiment of the present application, by adopting an array setting method, the plurality of bare battery cells are arranged in an array with two tangent to each other, and both ends are electrically connected through the first connecting piece and the second connecting piece respectively to form the main framework of the novel battery structure, achieving the purpose of optimizing the structure of the bare battery cell, thereby realizing the technical effect of optimizing the battery structure, and further solving the technical problems that the existing battery grouping method not only increases the structural complexity of the battery pack, but also improves the overall cost, and that the existing square large battery cell structure has poor thermal safety performance and uneven heat of the winding core. Description of the Drawings

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the battery pack of the present utility model;

[0020] Figure 2 is a schematic diagram of the explosion of the battery pack of the present utility model;

[0021] Figure 3 is a three-dimensional structure schematic diagram of the novel battery structure of the present utility model;

[0022] Figure 4 is another three-dimensional structure schematic diagram of the novel battery structure of the present utility model;

[0023] Figure 5 is a schematic diagram of the minimum unit structure of the novel battery structure arrangement of the present utility model;

[0024] Figure 6 is a three-dimensional structure schematic diagram of the cell cover plate of the battery pack of the present utility model; and

[0025] Figure 7 is a planar structure schematic diagram of the cell cover plate of the battery pack of the present utility model.

[0026] The reference signs are as follows:

[0027] 10, bare cell; 101, first bare cell; 102, second bare cell;

[0028] 20, positive electrode tab;

[0029] 30, negative electrode tab;

[0030] 40, first adapter plate; 401, extension part; 402, first welding part;

[0031] 50, second adapter plate; 501, second welding part;

[0032] 60, hollow area;

[0033] 70, heat dissipation holes;

[0034] 80, cell housing;

[0035] 90, cell cover plate; 901, limiting part; 902, positive electrode column; 903, negative electrode column. Detailed implementation manners

[0036] In order to enable those skilled in the art of the present technology to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] It should be noted that in the description and claims of this application and the above-mentioned drawings, the terms "first", "second", etc. 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 as to implement the embodiments of this application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] In addition, the terms "installed", "set up", "provided with", "connected", "linked", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0039] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with the embodiments to detail this application.

[0040] As Figures 1-7 shown, this application relates to a novel battery structure and a battery pack. As Figures 3-4 shown, the novel battery structure includes: a plurality of bare battery cells 10; the bare battery cells 10 are composed of a positive electrode sheet, a negative electrode sheet and a separator. Since the bare battery cells 10 have no outer shell encapsulation, the structure is relatively simple and it is easier to perform internal inspections and measurements. The bare battery cells 10 have functions including but not limited to the following: flexibility, which can be encapsulated in different forms according to needs; easy to test, and it is easier to perform various performance tests and adjustments; cost control, which can better control costs during the production process. Preferably, a group of bare battery cells 10 is formed by connecting a plurality of cylindrical bare battery cells 10 in parallel.

[0041] A plurality of positive electrode tabs 20 are respectively connected to one end of the plurality of bare battery cells 10; it can achieve a good positive electrode electrical connection effect, thus providing guarantee for subsequent stable power transmission.

[0042] Preferably, the directions of the plurality of positive electrode tabs 20 are kept consistent; it can achieve the effect of facilitating assembly.

[0043] A plurality of negative electrode tabs 30 are respectively arranged on the bare battery cell 10 at one end far from the positive electrode tab 20; it can achieve a good negative electrode electrical connection effect and also achieve a good cooperation effect with other components.

[0044] Specifically, the positive electrode tab 20 and the negative electrode tab 30 are important components inside the battery. The positive electrode tab 20 is connected to the positive electrode plate, and the negative electrode tab 30 is connected to the negative electrode plate, and is used for inputting or outputting current to realize the connection between the battery cell and the external circuit.

[0045] The positive electrode material is coated on the positive electrode current collector to form the positive electrode plate. The positive electrode current collector contains a plurality of positive electrode tabs 20, and the positive electrode tabs 20 are welded inside the positive electrode terminal of the battery cell cover plate 90 to form a current path. Of course, the same is true for the negative electrode, which will not be elaborated here.

[0046] Preferably, the materials of the positive electrode current collector and the positive electrode tab 20 are aluminum; because aluminum has excellent electrical conductivity and antioxidant properties, it is commonly used for the materials of the positive electrode current collector and the positive electrode tab 20.

[0047] Preferably, the lithium-ion battery uses copper as the negative electrode current collector and tab, and the sodium-ion battery uses aluminum as the negative electrode current collector and tab.

[0048] The first adapter plate 40 is connected to one end of the plurality of bare battery cells 10 and is respectively fitted with the plurality of positive electrode tabs 20; by fitting the plurality of positive electrode tabs 20 on the first adapter plate 40, a good assembly effect can be achieved; at the same time, a stable electrical connection effect can also be ensured. Among them, the first adapter plate 40 is a positive electrode adapter plate.

[0049] The second adapter plate 50 is connected to the other end of the plurality of bare battery cells 10 and is respectively fitted with the plurality of negative electrode tabs 30; by fitting the plurality of negative electrode tabs 30 on the second adapter plate 50, a good assembly effect can be achieved; at the same time, a stable electrical connection effect can also be ensured. Among them, the second adapter plate 50 is a negative electrode adapter plate.

[0050] By respectively reserving the positive electrode tab 20 and the negative electrode tab 30 on both sides of the bare battery cell 10, the tabs are turned over and welded on the adapter plate after passing through the adapter plate.

[0051] Among them, the plurality of bare battery cells 10 are arranged in a pairwise tangent array, and both ends are electrically connected through the first adapter plate 40 and the second adapter plate 50 to form the main framework of the new battery structure.

[0052] Specifically, by closely arranging a plurality of the bare battery cells 10 in a pairwise tangent array, the space can be utilized maximally, and the energy density of the battery pack can be improved; adopting this arrangement increases the contact area between the battery cells, which helps to improve the overall structural stability of the battery pack; the tangent contact between the battery cells contributes to the uniform distribution and conduction of heat, enhances the heat dissipation performance, and avoids local overheating.

[0053] Through the unified connection of the first adapter piece 40 and the second adapter piece 50, the electrical connection between the battery cells is simplified, and the connection complexity and production cost are reduced.

[0054] Of course, to improve the space utilization rate, the shape formed by the array of the bare battery cells 10 is a square or a quasi-square.

[0055] The present application has the following beneficial effects:

[0056] 1. The size of the wound core is compatible with the existing cylindrical solution, the production lines can be shared, the production efficiency is high, the product consistency is good, and the manufacturing cost is low;

[0057] 2. Compared with the large square battery cell solution, the size of a single wound core is small, heat accumulation is not likely to occur, the risk of thermal runaway is lower than that of large square battery cells, and the safety is better.

[0058] From the above description, it can be seen that the present application achieves the following technical effects:

[0059] In the embodiment of the present application, an array setting method is adopted. By arranging a plurality of the bare battery cells 10 in a pairwise tangent array and electrically connecting the two ends through the first adapter piece 40 and the second adapter piece 50 respectively to form the main framework of the new battery structure, the purpose of optimizing the structure of the bare battery cells 10 is achieved, thereby realizing the technical effect of optimizing the battery structure, and further solving the technical problems that the existing battery grouping method not only increases the structural complexity of the battery pack, but also improves the overall cost, and that the existing large square battery cell structure has poor thermal safety performance and uneven heat of the wound core.

[0060] Furthermore, a plurality of the bare battery cells 10 are arranged in a staggered manner, and the shape is honeycomb-shaped. It can be understood that the effect of closely staggered arrangement between the bare battery cells 10 can be achieved, thereby improving the structural stability of the bare battery cells 10, and at the same time, the space utilization rate can also be improved.

[0061] Furthermore, the number of a plurality of the bare battery cells 10 is 2 - 100. It can be understood that it can adapt to the requirements of various usage occasions, thereby achieving the effect of flexible use.

[0062] Such as Figure 5As shown, a plurality of the bare battery cells 10 include: a first bare battery cell 101 and a second bare battery cell 102 that are tangent to each other and are respectively tangent to the two first bare battery cells 101 to form a minimum array unit, and the minimum array units are arranged, arrayed, and filled in a staggered mirror image manner in a preset direction. It can be understood that good arrangement and array effects can be achieved, thereby ensuring a stable assembly effect between the bare battery cells 10.

[0063] Further, the first adapter piece 40 and the second adapter piece 50 are respectively provided with hollowed-out areas 60 that match the positions of the plurality of positive electrode tabs 20 and the plurality of negative electrode tabs 30. It can be understood that by respectively providing a plurality of hollowed-out areas 60, a good assembly effect with the positive electrode tabs 20 and the negative electrode tabs 30 can be achieved, thereby ensuring a stable connection effect, and further providing a guarantee for subsequent electrical transmission.

[0064] Furthermore, the hollowed-out area 60 is arc-shaped. It can be understood that by setting the hollowed-out area 60 to be arc-shaped, it is convenient for the electrode tabs to pass through normally within a certain angle range (±60°), and an adjustable assembly effect can be achieved, thereby providing a guarantee for good assembly.

[0065] Further, the first adapter piece 40 and the second adapter piece 50 are also respectively provided with heat dissipation holes 70, and the heat dissipation holes 70 are located at the gaps formed by the array of the plurality of bare battery cells 10. It can be understood that by providing the heat dissipation holes 70, a good heat dissipation effect can be achieved, thereby reducing the temperature inside the battery; at the same time, by aligning the heat dissipation holes 70 with the gaps formed after the bare battery cells 10 are assembled, the heat dissipation efficiency can be improved.

[0066] Preferably, the shape of the heat dissipation holes 70 is triangular. A good matching effect with the gaps formed by the bare battery cells 10 can be achieved.

[0067] Further, the first adapter piece 40 includes: an extension part 401 provided on one side of the first adapter piece 40 and extending along the length direction of the bare battery cell 10, and a first welding part 402 is horizontally provided at the bottom of the extension part 401. It can be understood that a basis and guarantee for subsequent good welding assembly can be achieved. Among them, the extension part 401 is a long strip-shaped area, which leads the positive and negative electrodes of the battery cell group to the same side, facilitating welding with the battery cell terminal posts.

[0068] Further, a second welding part 501 is oppositely provided on the side of the second adapter piece 50 away from the first adapter piece 40, and the second welding part 501 is arranged in parallel with the first welding part 402. It can be understood that a good welding effect can be achieved, thereby achieving a good assembly effect between components.

[0069] Preferably, the second welding part 501 and the first welding part 402 are located on the same horizontal plane, which can achieve the effect of facilitating assembly and ensure good precision at the same time.

[0070] Furthermore, the first adapter piece 40 and the positive electrode tab 20, and the second adapter piece 50 and the negative electrode tab 30 are all welded by ultrasonic welding, laser welding, resistance welding or soldering. It can be understood that good welding and fixing effects can be achieved.

[0071] As Figures 1-2 shown, the present application also relates to a battery pack, including the novel battery structure as described above;

[0072] It further includes: a hollow battery cell housing 80 for placing the novel battery cell structure, a battery cell cover plate 90 is provided on the top of the battery cell housing 80, a positive electrode post 902 and a negative electrode post 903 are respectively provided on the battery cell cover plate 90, and a plurality of limiting parts 901 are provided on the inner wall of the battery cell cover plate 90.

[0073] Specifically, the battery cell housing 80 can achieve a good accommodating and protecting effect on the bare battery cells 10, so as to assemble the bare battery cells 10 into the battery cell housing 80; to ensure a sufficient accommodating effect, the depth of the battery cell housing 80 is greater than the height of the bare battery cell 10.

[0074] The bare battery cells 10 are first welded to the battery cell cover plate 90, then put into the battery housing, and finally sealed by laser welding or bonding.

[0075] To ensure a good sealing effect, a battery cell cover plate 90 is provided on the top of the battery cell housing 80, so as to achieve a good covering and sealing effect with the battery cell housing 80.

[0076] By respectively providing a positive electrode post 902 and a negative electrode post 903 on the battery cell cover plate 90, and connecting the positive electrode post 902 to the first welding part 402 and the negative electrode post 903 to the second welding part 501, a good connection effect with the first adapter piece 40 and the second adapter piece 50 can be achieved.

[0077] As Figures 6-7 shown, a plurality of limiting parts 901 are provided on the inner wall of the battery cell cover plate 90; by providing a plurality of limiting parts 901, a good limiting and fixing effect on the bare battery cells 10 can be achieved, thereby preventing them from shifting.

[0078] Preferably, the limiting part 901 is an arc-shaped convex part; by adopting the arc-shaped convex part, an effect matching the outer edge of the bare battery cells 10 can be achieved, thereby ensuring that the bare battery cells 10 are in a stable state.

[0079] Preferably, a number of limiting grooves are further provided on the inner wall of the battery cell cover plate 90; by providing a number of limiting grooves, a good limiting and clamping effect with the adapter piece can be achieved, thereby achieving a good fixing effect on the adapter piece.

[0080] Furthermore, the battery cell housing 80 can be integrally formed by injection molding; the material of the battery cell housing 80 can be selected from plastics such as PP, PC, ABS, PPS, etc., or can also be processed from metal materials such as aluminum alloy, stainless steel, etc.

[0081] Furthermore, the main material of the battery pack cover plate can be plastic or metal, and its material is the same as that of the battery pack housing. The materials of the battery positive and negative terminal posts are aluminum or copper.

[0082] Furthermore, a liquid injection port is reserved on the battery pack, and the position is at the bottom of the battery housing or on the battery cell cover plate 90. This liquid injection port can also be used as a pressure relief and exhaust port. It can achieve a good effect of injecting electrolyte, and at the same time, it can also achieve a good effect of pressure relief and exhaust.

[0083] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A new battery structure, characterized in that: include: A plurality of bare battery cells (10); A plurality of positive electrode tabs (20) are respectively connected to one end of a plurality of bare cells (10); A plurality of negative electrode tabs (30) are respectively arranged on the bare battery cell (10) at one end away from the positive electrode tab (20); A first adapter sheet (40) is connected to one end of the plurality of bare cells (10) and is respectively engaged with the plurality of positive electrode tabs (20); and A second adapter (50) is connected to the other ends of the plurality of bare cells (10) and is respectively engaged with the plurality of negative electrode tabs (30); Wherein, a plurality of the bare cells (10) are arranged in an array tangentially to each other, and the two ends are electrically connected via the first adapter plate (40) and the second adapter plate (50) respectively, so as to form a main structure of a novel battery structure.

2. The novel battery structure according to claim 1 is characterized in that: The plurality of bare cells (10) are arranged in a staggered manner and have a honeycomb shape.

3. The novel battery structure according to claim 1 is characterized in that: The number of the plurality of bare battery cells (10) is 2-100.

4. The novel battery structure according to claim 1 is characterized in that: The plurality of bare battery cells (10) include: two first bare battery cells (101) arranged tangentially to each other and second bare battery cells (102) arranged tangentially to the two first bare battery cells (101) respectively, so as to form a minimum array unit, and the minimum array unit is arrayed in a preset direction and filled in a staggered mirror image.

5. The novel battery structure according to claim 1 is characterized in that: The first adapter plate (40) and the second adapter plate (50) are respectively provided with hollow areas (60) that match the positions of the plurality of positive electrode tabs (20) and the plurality of negative electrode tabs (30).

6. The novel battery structure according to claim 5 is characterized in that: The hollow area (60) is in an arc shape.

7. The novel battery structure according to claim 1 is characterized in that: The first adapter plate (40) and the second adapter plate (50) are also respectively provided with heat dissipation holes (70), and the heat dissipation holes (70) are located at the gaps formed by the array of the plurality of bare cells (10).

8. The novel battery structure according to claim 1 is characterized in that: The first adapter plate (40) comprises: an extension portion (401) arranged on one side of the first adapter plate (40) and extending along the length direction of the bare battery cell (10), and a first welding portion (402) is horizontally arranged at the bottom of the extension portion (401).

9. The novel battery structure according to claim 8 is characterized in that: A second welding portion (501) is arranged opposite to a side of the second adapter plate (50) away from the first adapter plate (40), and the second welding portion (501) is arranged parallel to the first welding portion (402).

10. A battery pack, characterized in that A novel battery structure comprising any one of claims 1 to 9; The invention also comprises: a hollow battery cell shell (80) for accommodating the novel battery structure; the top cover of the battery cell shell (80) is provided with a battery cell cover plate (90); the battery cell cover plate (90) is respectively provided with a positive electrode column (902) and a negative electrode column (903); and the inner wall of the battery cell cover plate (90) is provided with a plurality of limit parts (901).

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