Battery pack and battery system

Abstract

The utility model discloses a battery pack and a battery system, and relates to the technical field of battery structures. The battery pack comprises: a housing; the partition plates are arranged in the shell at intervals in the preset direction and are parallel to the side edge of the shell; the plurality of naked battery cell groups are respectively arranged in a semi-open type battery cell cavity defined by the shell and the plurality of partition plates in a one-to-one correspondence manner; wherein the number of the naked battery cell groups is matched with the number of the battery cell cavities, and the volume of one naked battery cell group is smaller than the volume of one battery cell cavity so as to accommodate multiple naked battery cell groups with multiple specifications. According to the utility model, the packaging structure of the existing single battery cell is simplified, and the plurality of groups of naked battery cells are directly packaged in the shell and are connected in series and in parallel to form the battery pack, so that the number of structural parts of the battery cells is reduced, the production process flow of the battery cells is optimized, the production efficiency of the battery pack is improved, and the product cost of the battery pack is reduced.

Description

Technical Field

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

[0002] Lithium-ion batteries and sodium-ion batteries, as widely used secondary batteries at present, mainly consist of a positive electrode material, a negative electrode material, a separator, an electrolyte and a housing. According to different packaging forms, batteries can usually 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] The structure of the existing battery system is as follows: 1) For passenger cars, generally there is a module-free scheme, and a battery pack is a system: battery cells → battery system. The bare battery cells or bare battery cell groups are encapsulated with a housing to form single battery cells, and multiple single battery cells are placed in the battery pack and directly connected in series and parallel, and finally encapsulated with a large housing to form a battery pack. 2) For commercial vehicles and energy storage, generally there is a module-based scheme: battery cells → battery modules → battery packs → battery system. The bare battery cells or bare battery cell groups are encapsulated with a housing to form single battery cells, multiple single battery cells are first connected in series and parallel to form battery modules, multiple modules are placed in the battery pack and connected in series and parallel, and finally encapsulated with a housing to form a battery pack, and one or more battery packs form a battery system.

[0004] Therefore, in the existing traditional battery system scheme, each battery cell has an independent battery cell housing, and the grouped battery system also has a battery pack housing, resulting in complex battery production processes and low system grouping efficiency. Summary of the Utility Model

[0005] Utility Model Purpose: To provide a battery pack and a battery system to at least solve one of the problems existing in the above-mentioned prior art.

[0006] Technical Solution: A battery pack includes: a housing; a plurality of partition plates, which are arranged at intervals in the housing along a preset direction and are arranged parallel to the side of the housing; and a plurality of groups of bare battery cell groups, which are respectively arranged in semi-open battery cell cavities formed by enclosing the housing and the plurality of partition plates one by one; wherein, the number of the bare battery cell groups matches the number of the battery cell cavities, and the volume of one bare battery cell group is smaller than the volume of one battery cell cavity to accommodate multiple groups and multiple specifications of bare battery cell groups.

[0007] Preferably, the plurality of partition plates are respectively clamped with limit grooves vertically opened on the inner wall of the housing.

[0008] Preferably, the bare battery cell group includes: a plurality of bare battery cells; a plurality of positive electrode tabs respectively connected to one end of the plurality of bare battery cells; a plurality of negative electrode tabs respectively disposed on the bare battery cells at an end far from the positive electrode tabs; or, the plurality of positive electrode tabs and the plurality of negative electrode tabs are located on the same side of the plurality of bare battery cells;

[0009] a first adapter plate respectively connected to the plurality of positive electrode tabs; and a second adapter plate respectively connected to the plurality of negative electrode tabs.

[0010] Preferably, the shape of the bare battery cell is a circular bare battery cell or a square bare battery cell.

[0011] Preferably, a battery pack cover plate is embedded in the top of the housing, and a first positive electrode post and a first negative electrode post are respectively disposed on the battery pack cover plate. The first positive electrode post and the first negative electrode post are matched with the number of the battery cell cavities and are corresponding to the positions of the battery cell cavities.

[0012] Preferably, the bare battery cell group is a lithium-ion battery cell group, and the lithium-ion battery cell group is a lithium iron phosphate, lithium manganese iron phosphate, lithium manganate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate or lithium titanate material system; or, the bare battery cell group is a sodium-ion battery cell group, and the sodium-ion battery cell group is a layered oxide, polyanion or prussian blue material system.

[0013] To achieve the above object, according to another aspect of the present application, a battery system is further provided.

[0014] The battery system according to the present application includes the battery pack as described above;

[0015] A plurality of groups of the bare battery cell groups are connected in series or in parallel through the busbars of the battery connection assembly, and the busbars of the battery connection assembly are respectively connected to the first positive electrode post and the first negative electrode post.

[0016] Preferably, it further includes: a battery pack top cover covering the top of the housing; and

[0017] a battery management system connected to at least one acquisition wire harness of the battery connection assembly.

[0018] Preferably, an explosion-proof valve is provided at the bottom of the housing and is matched with the number of the battery cell cavities and is corresponding to the positions thereof; or, an explosion-proof valve is provided on the battery pack cover plate and is matched with the number of the battery cell cavities and is corresponding to the positions thereof.

[0019] Preferably, a second positive electrode post and a second negative electrode post are respectively disposed on the top of the battery pack top cover, and the second positive electrode post and the second negative electrode post are respectively electrically connected to the busbars of the battery connection assembly.

[0020] Beneficial effects: In the embodiment of the present application, an integrated setting method is adopted. By matching the number of the bare battery cell groups with the number of the battery cell cavities, and the volume of one bare battery cell group is smaller than the volume of one battery cell cavity, multiple groups and multiple specifications of bare battery cell groups can be accommodated, achieving the purpose of being able to set multiple groups and multiple specifications of bare battery cell groups in the housing. Thus, the packaging structure of the existing single battery cell is simplified. By directly packaging multiple groups of bare battery cells in one housing and connecting them in series and parallel to form a battery pack, the number of structural parts of the battery cells is reduced, the production process flow of the battery cells is optimized, the production efficiency of the battery pack is improved, and the product cost of the battery pack is reduced. Furthermore, the technical problem that in the existing traditional battery system solution, each battery cell has an independent battery cell housing, and the battery system after grouping also has a battery pack housing, resulting in complex battery production processes and low system grouping efficiency is solved. Brief Description of the Drawings

[0021] Figure 1 is a three-dimensional structural schematic diagram of the battery pack of the present utility model;

[0022] Figure 2 is an exploded view of the battery pack of the present utility model;

[0023] Figure 3 is a three-dimensional structural schematic diagram of the housing of the battery pack of the present utility model;

[0024] Figure 4 is a schematic diagram of the bottom structure of the housing of the battery pack of the present utility model;

[0025] Figure 5 is a three-dimensional structural schematic diagram of the battery pack cover of the battery pack of the present utility model;

[0026] Figure 6 is a three-dimensional structural schematic diagram of the bare battery cell group of the present utility model;

[0027] Figure 7 is another three-dimensional structural schematic diagram of the bare battery cell group of the present utility model;

[0028] Figure 8 is a schematic diagram of the minimum unit structure of the arrangement of the bare battery cell groups of the present utility model;

[0029] Figure 9 is a three-dimensional structural schematic diagram of the battery pack top cover of the battery system of the present utility model; and

[0030] Figure 10 is a three-dimensional structural schematic diagram of the battery connection component of the battery system of the present utility model.

[0031] Reference numerals are:

[0032] 10. Bare battery cell; 101. First bare battery cell; 102. Second bare battery cell;

[0033] 20. Positive electrode tab;

[0034] 30. Negative electrode tab;

[0035] 40. First adapter piece; 401. Extension part; 402. First welding part;

[0036] 50. Second adapter piece; 501. Second welding part;

[0037] 60. Hollow area;

[0038] 70. Heat dissipation hole;

[0039] 80. Housing;

[0040] 90. Battery pack cover plate; 901. First positive electrode post; 902. First negative electrode post;

[0041] 100. Partition board;

[0042] 110. Bare cell group;

[0043] 120. Battery connection assembly;

[0044] 130. Battery pack top cover; 1301. Second positive electrode post; 1302. Second negative electrode post;

[0045] 140. Battery management system;

[0046] 150. Explosion-proof valve. Detailed implementation manners

[0047] In order to enable those skilled in the art of this technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0048] It should be noted that in the description, claims and the above drawings of the present application, 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 the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present 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 that includes 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.

[0049] In addition, the terms "installed", "set", "provided with", "connected", "connected to", "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 the present utility model can be understood according to specific circumstances.

[0050] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0051] As Figures 1-10 shown, the present application relates to a battery pack and a battery system. As Figures 1-3 shown, the battery pack includes: a housing 80; the housing 80 refers to a shell-shaped protective body, which can achieve good effects of accommodating and protecting components; at the same time, it can also achieve good cooperation effects with components, so as to achieve the effects of various functions. Preferably, a plurality of reinforcing ribs are arranged at intervals and staggered on the outer surface of the housing 80; it can achieve the effect of improving the structural strength, thereby achieving the effects of improving battery safety, environmental adaptability, etc.

[0052] A plurality of partition plates 100 are arranged at intervals in the housing 80 along a preset direction and are parallel to the side of the housing 80; by arranging a plurality of partition plates 100, the effect of dividing the housing 80 into a plurality of chambers can be achieved, so that each battery cell can be connected in series and parallel and charged and discharged. Among them, the preset direction can be the long side direction or the short side direction of the housing, and the battery cell chambers are arranged in a shape like a Chinese character "mu", or a shape like a Chinese character "tian", or a nine-square grid, etc. In the present application, it is not limited.

[0053] For example: when arranged at intervals in the housing 80 along the long side direction of the housing 80 and parallel to the short side of the housing 80, the battery cell chambers are arranged in a shape like a Chinese character "mu".

[0054] When a plurality of partition plates 100 are arranged at staggered intervals in the housing 80 and are arranged parallel to the side edges of the housing 80, the battery cell cavities are arranged in a cross shape or a nine-square grid.

[0055] Furthermore, inclined guiding portions are arranged on both sides of the partition plate 100; the thickness of the inclined guiding portions decreases from the bottom to the top, which can achieve the effect of facilitating the assembly of the bare battery cell group 110. At the same time, it can also achieve good auxiliary fixing and supporting effects. Preferably, the angle of the inclined guiding portions is 1-3°.

[0056] A plurality of groups of bare battery cell groups 110 are respectively arranged in the semi-open battery cell cavities formed by enclosing the housing 80 and the plurality of partition plates 100; the effect of respectively placing a plurality of groups of bare battery cell groups 110 into the battery cell cavities can be achieved, so as to achieve a good assembly effect, and further, the required bare battery cell groups 110 can be selected for assembly according to actual usage requirements. Among them, the bare battery cells 10 can be square or cylindrical, and each battery cell cavity can accommodate 1 bare battery cell 10 or 1 bare battery cell group 110. The bare battery cell group 110 is composed of X bare battery cells 10 connected in parallel, and X = 2-100. It can adapt to the requirements of various usage occasions, so as to achieve the effect of flexible use.

[0057] Certainly, when the number of the bare battery cell groups 110 is only one bare battery cell and this bare battery cell is placed in the battery cell cavity, it is also within the protection scope of the present application.

[0058] Among them, the number of the bare battery cell groups 110 matches the number of the battery cell cavities, and the volume of one bare battery cell group 110 is smaller than the volume of one battery cell cavity to accommodate multiple groups and multiple specifications of bare battery cell groups 110. By matching the number of the battery cell cavities with the number of the bare battery cell groups 110, it can be ensured that there are enough cavities to accommodate the bare battery cell groups 110. At the same time, it can also avoid the situation of remaining battery cell cavities. And, by using the volume of the bare battery cell group 110 being smaller than the volume of one battery cell cavity to accommodate multiple groups and multiple specifications of bare battery cell groups 110; it can avoid the situation of interference, thus affecting the complete installation of the bare battery cell group 110 into the housing 80.

[0059] In order to improve the energy density of the battery pack, reduce the product cost and improve the production efficiency, the present application proposes a battery system. Compared with traditional batteries, the present application can be directly made into battery packs such as 12 / 24 / 36 / 48 / 60V, etc. The product cost is low, and the battery pack formation is convenient. It can be widely applied to automotive low-voltage power supplies, two / three-wheel vehicles, low-speed vehicles and energy storage fields.

[0060] From the above description, it can be seen that the present application has achieved the following technical effects:

[0061] In the embodiments of the present application, an integrated setting method is adopted. By matching the number of the bare cell groups 110 with the number of the cell cavities, and the volume of one bare cell group 110 is smaller than the volume of one cell cavity, multiple groups and multiple specifications of bare cell groups 110 can be accommodated, achieving the purpose of arranging multiple groups and multiple specifications of bare cell groups 110 in the housing 80. Thus, the packaging structure of the existing single cells is simplified. By directly packaging multiple groups of bare cells in one outer shell and connecting them in series and parallel to form a battery pack, the number of structural components of the cells is reduced, the production process flow of the cells is optimized, the production efficiency of the battery pack is improved, and the product cost of the battery pack is reduced. Furthermore, the technical problem that in the existing traditional battery system solutions, each cell has an independent cell outer shell, and the grouped battery system also has a battery pack outer shell, resulting in complex battery production processes and low system grouping efficiency, is solved.

[0062] The present utility model integrates the outer shells of multiple cells into one large outer shell, simplifying the structure of the battery module.

[0063] For example: The current cell is 3.2V 100Ah, and 4 cells are connected in series to form a 12.8V 100Ah battery pack. The present utility model can directly produce a 12.8V 100Ah battery pack. As those skilled in the art should be well aware, no exhaustive listing is made here.

[0064] The present application has the following beneficial effects compared with the traditional solution:

[0065] 1) The processes from the mixing of the positive and negative electrode materials of the cells to the production of the bare cells are the same.

[0066] 2) The process in the cell assembly stage is different. Originally, one bare cell or a bare cell group was assembled into one cell outer shell, and then processes such as sealing, liquid injection, formation, and grading were carried out. In the present utility model, multiple bare cells or bare cell groups are assembled into one battery pack outer shell, and then processes such as sealing, liquid injection, formation, and grading are carried out, greatly improving the production efficiency.

[0067] 3) When making the cells into a module, some mechanical parts and connecting parts are required. The present utility model can save some module mechanical parts, such as end plates, fasteners, etc., saving costs; at the same time, there is no process of assembling the cells into a module, and only the battery connection components need to be installed, improving the production efficiency.

[0068] Furthermore, several of the partition plates 100 are respectively clamped with the limiting grooves vertically formed on the inner wall of the housing 80. It can be understood that by clamping the partition plate 100 with the limiting groove on the inner wall of the housing 80, a good assembly effect can be achieved, so as to achieve the effect of facilitating the adjustment of the size of the battery cell cavity, and further the effect of being easy to accommodate battery cells of various specifications. Preferably, the number of the limiting grooves is multiple; this can facilitate the multi-point clamping effect of the partition plate 100.

[0069] Of course, to prevent the leakage of electrolyte between adjacent cavities and improve the sealing performance between each battery cell cavity, measures can be taken including but not limited to: sealing rings and / or sealants to improve the sealing performance; at the same time, to improve the insulation performance, measures can be taken including but not limited to: insulation coatings and partition plates 100 made of insulating materials.

[0070] As Figures 6-7 shown, the bare battery cell group 110 includes: a plurality of bare battery cells 10; a plurality of positive electrode tabs 20 respectively connected to one end of the plurality of bare battery cells 10; a plurality of negative electrode tabs 30 respectively arranged on the bare battery cells 10 at one end far from the positive electrode tabs 20; or, the plurality of positive electrode tabs 20 and the plurality of negative electrode tabs 30 are located on the same side of the plurality of bare battery cells 10;

[0071] a first adapter piece 40 respectively connected to the plurality of positive electrode tabs 20; and a second adapter piece 50 respectively connected to the plurality of negative electrode tabs 30;

[0072] Specifically, there are a plurality of bare battery cells 10; the bare battery cell 10 is composed of a positive electrode plate, a negative electrode plate and a separator. Since the bare battery cell 10 has no outer shell encapsulation, its structure is relatively simple and it is easier to perform internal inspections and measurements. The bare battery cell 10 has performance and 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, and the cost can be better controlled during the production process.

[0073] A plurality of positive electrode tabs 20 are respectively connected to one end of the plurality of bare battery cells 10; this can achieve a good positive electrode electrical connection effect, thus providing guarantee for subsequent stable power transmission.

[0074] Furthermore, the shape of the bare battery cell 10 is a circular bare battery cell or a square bare battery cell. This can achieve the effect of having multiple shapes to choose from, so as to meet the requirements of various usage scenarios.

[0075] Preferably, the directions of the plurality of positive electrode tabs 20 are kept consistent; this can achieve the effect of facilitating assembly.

[0076] A plurality of negative electrode tabs 30 are respectively disposed on the bare battery cell 10 at one end far from the positive electrode tab 20; or, a plurality of the positive electrode tabs 20 and a plurality of the negative electrode tabs 30 are located on the same side of the plurality of bare battery cells 10; good negative electrode electrical connection effects can be achieved, and good cooperation effects with other components can also be achieved.

[0077] 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.

[0078] When the shape of the plurality of bare battery cells 10 is a cylindrical (wound) bare battery cell group, the positive electrode tab 20 and the negative electrode tab 30 are located on both sides of the bare battery cell 10;

[0079] When the shape of the plurality of bare battery cells 10 is a square wound / laminated bare battery cell or bare battery cell group, the positive electrode tab 20 and the negative electrode tab 30 can be located on both sides of the bare battery cell 10 or on one side of the bare battery cell 10; preferably located on the same side of the bare battery cell 10.

[0080] The positive electrode material is coated on the positive electrode current collector to form a 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 first positive electrode column 902 of the battery pack cover plate 90 to form a current path. Of course, the same is true for the negative electrode, which will not be elaborated here.

[0081] 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 as the material for the positive electrode current collector and the positive electrode tab 20.

[0082] 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.

[0083] The first adapter piece 40 is respectively connected to a plurality of the positive electrode tabs 20; by embedding a plurality of the positive electrode tabs 20 on the first adapter piece 40, good assembly effects can be achieved; at the same time, stable electrical connection effects can also be ensured. Among them, the first adapter piece 40 is a positive electrode adapter piece.

[0084] The second adapter piece 50 is respectively connected to a plurality of the negative electrode tabs 30; by embedding a plurality of the negative electrode tabs 30 on the second adapter piece 50, good assembly effects can be achieved; at the same time, stable electrical connection effects can also be ensured. Among them, the second adapter piece 50 is a negative electrode adapter piece.

[0085] 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 piece after passing through the adapter piece; or, directly adhered to the adapter piece for welding.

[0086] When the shape of the bare battery cell 10 is a circular bare battery cell, a plurality of the bare battery cells 10 are arranged in an array with pairwise tangency, and both ends are electrically connected through the first adapter piece 40 and the second adapter piece 50 respectively to form a bare battery cell group.

[0087] 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.

[0088] 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.

[0089] Such as Figure 8 As 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 the second bare battery cell 102 is tangent to the two first bare battery cells 101 respectively to form a minimum array unit, and the minimum array unit is arranged, misaligned and mirror-filled in a preset direction. It can be understood that good arrangement and array effects can be achieved, so as to ensure the stable assembly effect between the bare battery cells 10.

[0090] Further, the first adapter piece 40 and the second adapter piece 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. It can be understood that by respectively providing a plurality of hollow areas 60, a good assembly effect with the positive electrode tabs 20 and the negative electrode tabs 30 can be achieved, so as to ensure the stable connection effect, and further provide a guarantee for subsequent electrical transmission.

[0091] Further, the first adapter piece 40 includes: an extension part 401 arranged 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 arranged at the bottom of the extension part 401. It can be understood that it can provide a basis and guarantee for subsequent good welding assembly. 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 post. This structure is mainly used for circular bare battery cells.

[0092] It should be known that when a square bare battery cell is adopted, the connection method is also adjusted accordingly, which should be well known to those skilled in the art.

[0093] Further, the first adapter piece 40 and the positive electrode tab 20, and the second adapter piece 50 and the negative electrode tab 30 all adopt ultrasonic welding, laser welding, resistance welding or soldering. It can be understood that a good welding and fixing effect can be achieved.

[0094] Such as Figure 5As shown, a battery pack cover plate 90 is embedded in the top of the housing 80. A first positive terminal 901 and a first negative terminal 902 are respectively arranged on the battery pack cover plate 90. The number of the first positive terminal 901 and the first negative terminal 902 matches the number of the battery cell cavities and corresponds to the positions of the battery cell cavities. Among them, the first positive terminal 901 is the positive terminal of the battery cell group, and the first negative terminal 902 is the negative terminal of the battery cell group.

[0095] Specifically, the housing 80 can achieve a good accommodating and protecting effect on the bare battery cell group 110, so as to assemble the bare battery cell group 110 in the housing 80. To ensure a sufficient accommodating effect, the depth of the housing 80 is greater than the height of the bare battery cell 10.

[0096] The bare battery cell 10 is first welded to the battery pack cover plate 90, then installed into the battery housing, and finally sealed by laser welding or bonding.

[0097] To ensure a good sealing effect, a battery pack cover plate 90 is arranged on the top of the housing 80, so as to achieve a good covering and sealing effect with the housing 80. The encapsulation of the housing 80 and the battery pack cover plate 90 can choose laser welding or sealant bonding to ensure that the battery cell cavity has good sealing performance and avoid electrolyte leakage. After the housing 80 and the battery pack cover plate 90 are encapsulated, the battery cell cavities are isolated from each other, and each single battery cell can be charged and discharged independently.

[0098] By respectively arranging a first positive terminal 901 and a first negative terminal 902 on the battery pack cover plate 90, and connecting the first positive terminal 901 to the first welding part 402 and the first negative terminal 902 to the second welding part 501, a good connection effect between the adapter plate and the terminal can be achieved.

[0099] When the bare battery cell group is circular, a plurality of limiting parts are arranged on the inner wall of the battery pack cover plate 90. By arranging a plurality of limiting parts, a good limiting and fixing effect on the bare battery cell group 110 can be achieved, so as to prevent it from displacing.

[0100] Preferably, the limiting part is an arc-shaped convex part. By adopting the arc-shaped convex part, an effect matching the outer edge of the bare battery cell group 110 can be achieved, so as to ensure that the bare battery cell group 110 is in a stable state.

[0101] Of course, when the bare battery cell group is square, the limiting parts can be not used.

[0102] Preferably, a plurality of limiting grooves are further arranged on the inner wall of the battery pack cover plate 90. By arranging a plurality of limiting grooves, a good limiting and clamping effect with the adapter plate can be achieved, so as to achieve a good fixing effect on the adapter plate.

[0103] Furthermore, the bare cell group 110 is a lithium-ion cell group, and the lithium-ion cell group is a lithium iron phosphate, lithium manganese iron phosphate, lithium manganate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, or lithium titanate material system; or, the bare cell group 110 is a sodium-ion cell group, and the sodium-ion cell group is a layered oxide, polyanion, or Prussian blue material system. It can be understood that the effect of multiple materials being available for selection can be achieved, thereby achieving the effect of flexible use, and further meeting the requirements of various usage scenarios.

[0104] Furthermore, the housing 80 can be integrally formed by injection molding; the material of the housing 80 can be selected from one or more of polyamide (PA), polycarbonate (PC), polyethylene (PE), polyimide (PI), polyoxymethylene (POM), polypropylene (PP), polyphenylene ether (PPO), polyphenylene sulfide (PPS), polyvinyl chloride (PVC), polystyrene (PS), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), or it can also be processed from metal materials such as aluminum alloy and stainless steel. Preferably, the interior of the battery housing 80 is divided into several cell cavities, and each cavity can accommodate one bare cell 10 or one bare cell group 110, and the number N of cavities is 2 - 100.

[0105] Preferably, if the housing 80 is made of plastic material, the separator 100 and the housing 80 are integrally formed by injection molding; if the housing 80 is made of metal material, the separator 100 and the housing 80 can be integrally formed by casting, and the separator 100 and the housing 80 need to be insulated, such as by spraying an insulating material.

[0106] As Figures 1-2 As shown in FIGS. 9 - 10, the present application also relates to a battery system, including the battery pack described above;

[0107] Several groups of the bare cell groups 110 are connected in series or in parallel through the busbars of the battery connection assembly 120, and the busbars of the battery connection assembly 120 are respectively connected to the first positive terminal 901 and the first negative terminal 902. A good electrical connection effect can be achieved, thereby ensuring a stable current transmission effect. The battery connection assembly 120 includes busbars, acquisition wire harnesses, etc. The cell terminals are connected in series and parallel through busbars, and the connection methods include but are not limited to: welding, screwing, or riveting.

[0108] Furthermore, it further includes: a battery pack top cover 130, covering the top of the housing 80; a battery management system 140, connected to at least one acquisition wire harness of the battery connection assembly 120.

[0109] Specifically, the battery pack top cover 130 refers to the top cover plate of the battery pack, which can cooperate with the housing 80 and the cell battery pack cover plate 90 to achieve a good closing effect, and then form a sealed space. The battery pack top cover 130 and the battery pack cover plate 90 are encapsulated together by means of laser welding, sealant bonding or bolt fixing, etc., to form an electrical compartment with dust and water protection functions, protecting components such as the battery connection assembly (CCS) 120, the battery management system (BMS) 140, and the wiring harness installed inside.

[0110] Battery Management System 140 (BMS): The BMS is a key system for monitoring and managing the performance of the battery pack. It ensures that the battery pack operates under safe, reliable, and efficient conditions. Its main functions include monitoring voltage, current, temperature, equalizing the cell voltages, and protecting the battery pack from hazards such as overcharging, over-discharging, and overheating, so as to achieve a good control effect and then ensure that the battery pack is in a good operating state.

[0111] For example: Adopt the one-to-one method: One battery management system (BMS) 140 is set for one battery pack. The battery management system 140 is connected to the acquisition wiring harness of the battery connection assembly 120 for acquiring information such as the voltage and temperature of the battery pack.

[0112] Another example: Adopt the one-to-many method: Several battery packs are connected in series or in parallel, and a set of battery management systems is set. The acquisition wiring harnesses of multiple battery connection assemblies 120 are connected to this battery management system 140; for example, 4 battery packs are connected in series, and the acquisition wiring harnesses of the 4 battery packs are connected to a large battery management system 140, that is, the battery management system 140 can simultaneously acquire information such as the voltage and temperature of the 4 battery packs.

[0113] Furthermore, the main material of the battery pack top cover 130 can be plastic or metal. The materials of the positive and negative battery terminals are aluminum or copper.

[0114] Preferably, when using the welding method, the materials of the housing 80, the battery pack cover plate 90, and the battery pack top cover 130 need to be the same.

[0115] When using the bonding method, the materials of the housing 80, the battery pack cover plate 90, and the battery pack top cover 130 can be different.

[0116] Such as Figure 4As shown, explosion-proof valves 150 are provided at the bottom of the housing 80, which are matched in number and corresponding in position to the number of the battery cell cavities; alternatively, explosion-proof valves 150 are provided on the battery pack cover plate 90, which are matched in number and corresponding in position to the number of the battery cell cavities. It can be understood that, as the explosion-proof valves 150 of the battery pack, they can relieve pressure in extreme cases to prevent the battery cells from exploding and catching fire. The explosion-proof valve 150 is composed of an explosion-proof port and an explosion-proof sheet. The explosion-proof sheet can be welded or bonded to the explosion-proof port in advance, or can be welded or bonded to the explosion-proof port after formation is completed.

[0117] Preferably, the number of explosion-proof valves 150 in each battery pack is equal to the number of battery cell cavities, and the positions correspond one by one.

[0118] Furthermore, a liquid injection port is provided on the battery cell cavity. The liquid injection port is used for injecting electrolyte, exhausting gas, etc.; among them, the liquid injection port is provided at the bottom of the housing 80; alternatively, the liquid injection port is provided on the battery pack cover plate 90. It can be understood that the main function of this liquid injection port is to inject electrolyte through this port during the production of the battery cells, and at the same time, exhaust the gas generated inside the battery cells through this port during the formation of the battery cells; after the formation of the battery cells is completed, the liquid injection port is sealed by a sealing sheet or a sealing nail.

[0119] Preferably, the explosion-proof port can also be used as the liquid injection port at the same time. It can be understood that during production, electrolyte is injected through the explosion-proof port, gas is exhausted through the explosion-proof port during formation, and after formation is completed, the explosion-proof sheet is welded or bonded to the explosion-proof port for sealing. At this time, the battery structure can be simplified, the production process can be reduced, the production efficiency can be improved, and the production cost can be reduced.

[0120] Furthermore, a second positive electrode post 1301 and a second negative electrode post 1302 are respectively provided at the top of the battery pack top cover 130. The second positive electrode post 1301 and the second negative electrode post 1302 are respectively electrically connected to the bus bar of the battery connection assembly 120. It can be understood that a good electrical connection effect can be achieved and a complete current path can be formed.

[0121] Furthermore, the temperature, current and voltage data of several groups of the bare battery cell groups 110 are collected in real time through several acquisition wire harnesses of the battery connection assembly 120, and the collected data is fed back to the battery management system 140. The battery management system 140 controls the battery pack to work according to the collected data signals and protects the battery pack when necessary. It can be understood that good voltage and temperature detection effects on the bare battery cell groups 110 in the battery cell cavity can be achieved, so as to provide a data basis for the control, protection, balancing, etc. of the battery pack, and further ensure that the battery pack is in a good state, improve the safety and reliability of the battery pack, and extend the service life of the battery pack.

[0122] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various equivalent transformations can be made to the technical solutions of the present utility model, and these equivalent transformations all fall within the protection scope of the present utility model.

Claims

1. Battery pack, characterized in that, Comprising: A housing (80); A plurality of partition plates (100), which are arranged at intervals in the housing (80) along a preset direction and are parallel to the side edges of the housing (80); and A plurality of groups of bare cell groups (110), which are respectively arranged in the semi-open cell cavities formed by enclosing the housing (80) and the plurality of partition plates (100) one by one; Wherein, the number of the bare cell groups (110) matches the number of the cell cavities, and the volume of one bare cell group (110) is smaller than the volume of one cell cavity to accommodate multiple groups and multiple specifications of bare cell groups (110).

2. The battery pack according to claim 1, wherein, The plurality of partition plates (100) are respectively clamped with the limiting grooves vertically opened on the inner wall of the housing (80).

3. The battery pack according to claim 1, characterized in that, The bare cell group (110) includes: a plurality of bare cells (10); a plurality of positive electrode tabs (20), which are respectively connected to one end of the plurality of bare cells (10); a plurality of negative electrode tabs (30), which are respectively arranged on the bare cells (10) at one end far from the positive electrode tabs (20); or, the plurality of positive electrode tabs (20) and the plurality of negative electrode tabs (30) are located on the same side of the plurality of bare cells (10); A first adapter plate (40), which is respectively connected to the plurality of positive electrode tabs (20); and a second adapter plate (50), which is respectively connected to the plurality of negative electrode tabs (30).

4. The battery pack according to claim 3, characterized in that, The shape of the bare cell (10) is a circular bare cell or a square bare cell.

5. The battery pack according to claim 1, characterized in that, A battery pack cover plate (90) is embedded in the top of the housing (80), and a first positive electrode post (901) and a first negative electrode post (902) are respectively arranged on the battery pack cover plate (90). The first positive electrode post (901) and the first negative electrode post (902) match the number of the cell cavities and correspond to the positions of the cell cavities.

6. The battery pack according to claim 1, wherein, The bare cell group (110) is a lithium-ion cell group, and the lithium-ion cell group is a lithium iron phosphate, lithium manganese iron phosphate, lithium manganate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate or lithium titanate material system; or, the bare cell group (110) is a sodium-ion cell group, and the sodium-ion cell group is a layered oxide, polyanion or Prussian blue material system.

7. Battery system, characterized in that, Including the battery pack according to any one of claims 1-6; The plurality of groups of bare cell groups (110) are connected in series or in parallel through the busbars of a battery connection assembly (120), and the busbars of the battery connection assembly (120) are respectively connected to the first positive electrode post (901) and the first negative electrode post (902).

8. The battery system according to claim 7, wherein, Further comprising: A battery pack top cover (130), which is covered on the top of the housing (80); And A battery management system (140), which is connected to at least one acquisition wire harness of the battery connection assembly (120).

9. The battery system according to claim 7, wherein An explosion-proof valve (150) matching the number of the cell cavities and corresponding to the positions is arranged at the bottom of the housing (80); or, an explosion-proof valve (150) matching the number of the cell cavities and corresponding to the positions is arranged on the battery pack cover plate (90).

10. The battery system according to claim 8, wherein The top of the battery pack top cover (130) is respectively provided with a second positive electrode post (1301) and a second negative electrode post (1302), and the second positive electrode post (1301) and the second negative electrode post (1302) are respectively electrically connected to the bus bar of the battery connection assembly (120).

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