A battery system

Abstract

The application discloses a battery system, which comprises a lower box body; a first battery cell module and a second battery cell module are arranged on the left and right sides of the inner cavity of the lower box body respectively; the first battery cell module and the second battery cell module each comprise two battery cell stack bodies; each battery cell stack body comprises a plurality of battery cell monomers, and an inter-battery cell filling plate is arranged between any two adjacent battery cell monomers; the bottom of each battery cell stack body is bonded to the top surface of the bottom of the lower box body; a first positioning component is arranged between the two battery cell stack bodies in the first battery cell module and the second battery cell module respectively; a battery cell longitudinal beam end plate is vertically arranged on the opposite side of the first battery cell module and the second battery cell module respectively; and the opposite sides of the two battery cell longitudinal beam end plates are connected vertically through a transversely distributed elastic component. The battery system can not only realize the limiting installation and pre-tightening of the battery cell stack bodies, but also effectively relieve the expansion force formed by the whole battery cell stack body, and has great significance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power lithium battery, in particular to a battery system. BACKGROUND

[0002] At present, lithium ion battery has the advantages of high specific energy, multiple cycle times and long storage time, and is widely used not only in portable electronic devices (such as mobile phones, digital cameras and laptop computers), but also in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric devices, so the performance requirements of lithium ion battery are getting higher and higher.

[0003] However, for the current lithium ion power battery system, it has a battery stack (i.e. including a plurality of longitudinally arranged cell monomers) inside, and the cell monomer will generate expansion force in the stacking direction (e.g. the large face direction of the cell monomer, i.e. the left and right large side direction of the longitudinally placed cell monomer) during the cycle process, and the expansion force will increase with the increase of cycle times, so that the overall expansion force of the battery stack increases.

[0004] In the cycle of the battery system, the stress of each cell monomer in the battery stack gradually increases, and since the existing battery stack is strictly limited by the external structure (i.e. not to move, the position of each cell monomer remains unchanged), as the overall expansion force of the battery stack increases, under the action of excessive expansion force, the cell monomers will affect each other (e.g. mutual extrusion), so that the service life of the cell monomer will be greatly attenuated, affecting the service life of the cell monomer and the entire battery system. SUMMARY

[0005] The purpose of the present application is to overcome the technical defects of the prior art and provide a battery system.

[0006] To this end, the present application provides a battery system, which comprises a hollow lower box body with an open top;

[0007] The top of the lower box body is covered with an upper box body;

[0008] The left and right sides of the inner cavity of the lower box body are respectively provided with a first cell module and a second cell module;

[0009] The first cell module and the second cell module are symmetrically distributed;

[0010] The first cell module and the second cell module respectively comprise two cell stacks;

[0011] Each cell stack comprises a plurality of cell monomers distributed transversely and arranged longitudinally in parallel;

[0012] For each of the cell stack, any two adjacent cell monomers are provided with an inter-cell filler plate;

[0013] The bottom of each cell stack is bonded to the top surface of the bottom of the lower box;

[0014] Two cell stacks in the first cell module and two cell stacks in the second cell module are respectively provided with a horizontally distributed bottom first positioning component;

[0015] The first cell module and the second cell module are respectively provided with a longitudinally distributed cell longitudinal beam end plate on the opposite side;

[0016] The longitudinally middle position of the opposite side of the two cell longitudinal beam end plates is connected vertically through a horizontally distributed elastic component.

[0017] Preferably, the front and rear sides of the lower box are respectively provided with a lower box bottom plate vertically;

[0018] The left and right sides of the lower box are respectively provided with a lower box end plate vertically;

[0019] Each lower box bottom plate is fixedly provided with a bottom second positioning component on the side bottom facing each cell stack through welding or bonding connection mode.

[0020] Preferably, the horizontal length of the bottom second positioning component is equal to the horizontal length of the cell stack;

[0021] The longitudinal section shape of each bottom second positioning component is L-shaped.

[0022] Preferably, each bottom second positioning component includes a horizontally distributed bottom second positioning component mounting block;

[0023] The bottom second positioning component mounting block is perpendicular to the lower box bottom plate;

[0024] The outer side of the bottom second positioning component mounting block is connected with the lower box end plate through welding or bonding connection mode;

[0025] The top of the bottom second positioning component mounting block is provided with a horizontally horizontally distributed bottom second positioning component positioning block;

[0026] The bottom surface of the bottom second positioning component positioning block is bonded to the top surface of the lower box bottom plate through structural adhesive.

[0027] Preferably, each bottom first positioning component respectively includes a bottom first positioning component mounting block and a bottom first positioning component positioning block;

[0028] The first positioning component mounting block top is vertically provided with a bottom first positioning component positioning block;

[0029] The first positioning component mounting block bottom surface is fixedly connected to the lower box bottom plate top surface by welding or bonding.

[0030] Preferably, the elastic component includes two fixed parts distributed longitudinally and one elastic part distributed transversely.

[0031] The two fixed parts are distributed transversely and are connected by the elastic part at the middle of the opposite sides.

[0032] Preferably, each fixed part includes an elastic component fixed plate distributed longitudinally.

[0033] The elastic component fixed plate middle lower part is provided with an elastic component mounting slot opening downward.

[0034] Preferably, the elastic part includes an end elastic plate distributed transversely.

[0035] The end elastic plate top front side and back side are respectively provided with at least one middle elastic strip distributed transversely.

[0036] The left and right sides of the end elastic plate are respectively provided with an elastic part mounting block.

[0037] The elastic part mounting block is connected to the elastic component mounting slot in the fixed part.

[0038] Preferably, the two electric core longitudinal beam end plates are respectively provided with a fixed part limiting groove at the longitudinal middle position of the opposite sides.

[0039] The fixed part limiting groove is connected to the elastic component fixed plate in the fixed part.

[0040] Preferably, each electric core longitudinal beam end plate is provided with a plurality of weight reduction holes penetrating up and down.

[0041] As can be seen from the technical solutions provided by the present application, compared with the prior art, the present application provides a battery system with a scientific structure design. The elastic component is added between the electric core longitudinal beam end plates on the opposite sides of the first electric core module and the second electric core module (the two modules respectively include two electric core stack bodies), forming a structure design of the electric core longitudinal beam end plates that can move transversely. This not only can realize the limiting installation and pre-tightening of the electric core stack body, but also can effectively relieve the expansion force of the battery stack body as a whole, so that the stress of the electric core monomer in the electric core stack body during the cycle process is kept in a relatively constant range, avoiding the large attenuation of the service life of the electric core monomer, thereby guaranteeing the cycle life of the battery system, which has great practical significance. Attached Figure Description

[0042] Figure 1 A three-dimensional assembly diagram of a battery system provided by the present invention;

[0043] Figure 2 This is a schematic diagram of the internal structure of a battery system provided by the present invention, that is, a top view when the upper casing is removed;

[0044] Figure 3 A top view of a battery system provided by the present invention, with the upper casing removed and no multiple individual battery cells placed there;

[0045] Figure 4 This invention provides a schematic diagram of the structure of a battery system comprising two stacked battery cells.

[0046] Figure 5 A schematic diagram of the structure of the bottom first positioning component in a battery system provided by the present invention;

[0047] Figure 6 A schematic diagram of the structure of the bottom second positioning component in a battery system provided by the present invention;

[0048] Figure 7 This invention provides a schematic diagram of the structure of an elastic component in a battery system.

[0049] Figure 8 A schematic diagram of the fixing part of an elastic component in a battery system provided by the present invention;

[0050] Figure 9 A schematic diagram of the structure of the elastic part of the elastic component in a battery system provided by the present invention;

[0051] Figure 10 A schematic diagram of the cell end plate in a battery system provided by the present invention;

[0052] In the diagram, 1 is the upper box, 2 is the lower box, 201 is the bottom plate of the lower box, and 202 is the end plate of the lower box.

[0053] 3. Battery cell longitudinal beam end plate, 301, fixing part limiting groove, 302, weight reduction hole;

[0054] 4. Elastic component; 401. Fixing part; 4011. Elastic component fixing plate; 4012. Elastic component mounting groove.

[0055] 402. Elastic part; 4021. Elastic part mounting block; 4022. End elastic plate; 4023. Middle elastic strip;

[0056] 5, cell stack, 501, inter-cell filler plate, 502, cell unit;

[0057] 6, bottom first positioning component, 601, bottom first positioning component mounting block, 602, bottom first positioning component positioning block;

[0058] 7, bottom second positioning component, 701, bottom second positioning component mounting block;

[0059] 702, bottom second positioning component positioning block, 8, cell mounting space. DETAILED DESCRIPTION

[0060] The technical solutions of the present application will be described in detail below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0062] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0063] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0064] Reference Figures 1 to 10The application provides a battery system, which comprises a hollow and top-open lower box 2;

[0065] The top of the lower box 2 is covered by the upper box 1;

[0066] The left and right sides of the inner cavity of the lower box 2 are respectively provided with a first battery cell module and a second battery cell module;

[0067] The first battery cell module and the second battery cell module are distributed in a left-right symmetry mode;

[0068] The first battery cell module and the second battery cell module respectively comprise two battery cell stacks 5;

[0069] That is to say, the battery system comprises four battery cell stacks 5 in total;

[0070] Each battery cell stack 5 comprises a plurality of battery cell monomers 502 which are distributed in a transverse mode and arranged in a longitudinal parallel mode;

[0071] For each battery cell stack 5, a battery cell inter-filling plate 501 is arranged between any two adjacent battery cell monomers 502;

[0072] The bottom of each battery cell stack 5 is bonded (specifically, the bonding can be realized by using an existing heat-conducting structural adhesive) to the top surface of the bottom of the lower box 2;

[0073] A bottom first positioning component 6 is arranged between the two battery cell stacks 5 in the first battery cell module and between the two battery cell stacks 5 in the second battery cell module in a transverse mode;

[0074] A longitudinal distribution battery cell longitudinal beam end plate 3 is vertically arranged on the opposite side of the first battery cell module and the second battery cell module;

[0075] The longitudinal middle positions of the opposite sides of the two battery cell longitudinal beam end plates 3 are connected in a vertical mode by a transversely distributed elastic component 4.

[0076] In the application, the battery cell inter-filling plate 501 is a PU foam plate or a foam gasket, which is used for absorbing the expansion force generated by the battery cell monomer during use and improving the cycle life of the system.

[0077] In the application, a lower box bottom plate 201 is vertically arranged on the front and back sides of the lower box 2;

[0078] A lower box end plate 202 is vertically arranged on the left and right sides of the lower box 2;

[0079] Each lower box bottom plate 201 is fixedly provided with a bottom second positioning component 7 on the side bottom facing each battery cell stack 5 by a welding or bonding connection mode.

[0080] Specifically, the transverse length of the bottom second positioning component 7 is equal to the transverse length of the battery cell stack 5.

[0081] Specifically, the longitudinal section shape of each bottom second positioning component 7 is L-shaped.

[0082] Specifically, as shown in Figure 6 Each bottom second positioning component 7 includes a transversely distributed bottom second positioning component mounting block 701.

[0083] The bottom second positioning component mounting block 701 is perpendicular to the bottom plate 201 of the lower box body.

[0084] The outer side of the bottom second positioning component mounting block 701 (i.e. the side away from the battery cell stack 5) is connected to the end plate 202 of the lower box body by welding or bonding (e.g. by using existing structural adhesive).

[0085] The top of the bottom second positioning component mounting block 701 is provided with a transversely horizontally distributed bottom second positioning component positioning block 702.

[0086] The bottom surface of the bottom second positioning component positioning block 702 is bonded to the top surface of the bottom plate 201 of the lower box body by structural adhesive.

[0087] It should be noted that for the present application, the bottom second positioning component 7 can be installed on the left and right sides of the lower box body by welding, and the bottom second positioning component mounting block 701 can increase the strength of the box body while positioning the side surface of the battery cell and the side wall of the box body. The lower side of the bottom second positioning component positioning block 702 can reserve space for the use of adhesive.

[0088] In the present application, the bottom of each bottom first positioning component 6 is fixedly connected to the top surface of the bottom plate of the lower box body 2 by welding or bonding.

[0089] Specifically, as shown in Figure 5 Each bottom first positioning component 6 includes a bottom first positioning component mounting block 601 and a bottom first positioning component positioning block 602.

[0090] The top of the transversely distributed first positioning component mounting block 601 is provided with a bottom first positioning component positioning block 602 vertically.

[0091] The bottom surface of the first positioning component mounting block 601 is fixedly connected to the top surface of the bottom plate of the lower box body 2 by welding or bonding.

[0092] It should be noted that for the present application, the first positioning component 6 can be installed in the middle of the top surface of the bottom plate of the lower box 2 by welding, and the first positioning component mounting block 601 can increase the strength of the box while positioning the two parallel battery cells.

[0093] In the present application, as shown in Figure 7 The elastic component 4 includes two fixed parts 401 distributed longitudinally and one elastic part 402 distributed transversely.

[0094] The two fixed parts 401 are transversely spaced apart, and the middle of the opposite side of the two is connected perpendicularly by the elastic part 402.

[0095] It should be noted that for the present application, the fixed part 401 is used to fix the elastic part 402 in the box structure, and the elastic part 402 is responsible for absorbing the expansion force generated by the battery cell stack 5.

[0096] In particular, as shown in Figure 8 Each fixed part 401 includes an elastic component fixing plate 4011 distributed longitudinally.

[0097] The lower middle position of the elastic component fixing plate 4011 is provided with an elastic component mounting slot 4012 opening downward.

[0098] It should be noted that for the present application, the main function of the elastic component fixing plate 4011 is to fix the elastic component 4 between the two battery cell longitudinal beam end plates 3, which can be fixed by bolt connection or adhesion.

[0099] In particular, as shown in Figure 9 The elastic part 402 includes an end elastic plate 4022 distributed transversely.

[0100] The top front side and the rear side of the end elastic plate 4022 are respectively provided with at least one transversely distributed middle elastic strip 4023.

[0101] The left and right sides of the end elastic plate 4022 respectively have an elastic part mounting block 4021.

[0102] The elastic part mounting block 4021 is connected (for example, inserted) with the elastic component mounting slot 4012 in the fixed part 40.

[0103] In particular, the top view shape (i.e. the projection shape on the horizontal plane) of the middle elastic strip 402 is S-shaped.

[0104] It should be noted that for the present application, the end elastic plate 4022 can be selected to have different shapes to limit its deformation displacement, such as S-shaped, etc. The design of the middle elastic strip 4023 can reserve space for deformation.

[0105] It should be noted that the elastic part 402 is made of existing elastic materials. The end elastic plate 4022 is used to deform on both sides when subjected to extrusion, thereby playing a role in absorbing expansion force. The middle elastic strip 4023 mainly prevents the end elastic plate 4022 from deforming to one side and damaging the components.

[0106] In the present application, see the specific implementation shown in Figure 10 As shown, two cell longitudinal beam end plates 3 are respectively provided with a fixed part limiting groove 301 at the longitudinal middle position of the opposite side;

[0107] The fixed part limiting groove 301 is connected (using bolt connection or adhesive bonding) with the elastic part fixing plate 4011 of the fixed part 401 in the elastic part 4.

[0108] Specifically, each cell longitudinal beam end plate 3 is provided with a plurality of weight-reducing holes 302 that pass through up and down.

[0109] It should be noted that for the present application, the battery system of the present application optimizes the structure, adopts the form of CTP (Cell To Pack, i.e. cell direct integration into battery pack, thereby eliminating the intermediate module link), reduces the number of end plates, and improves the system energy density.

[0110] Based on the above technical scheme, for the present application, the elastic part 4 is fixed by the fixed part 401 thereon and the fixed part limiting groove 301 on the cell longitudinal beam end plate 3, and the elastic part 402 thereon is used to realize the movement of the cell longitudinal beam end plate 3. The battery system of the present application comprises a lower box body frame composed of a lower box body bottom plate and a lower box body end plate, and a positioning part (i.e. a bottom first positioning part and a bottom second positioning part) is installed on the side and the middle part, which is used to install and position the cell stack, and the box structure is strengthened.

[0111] In order to more clearly understand the technical scheme of the present application, the assembly process of the present application is described below.

[0112] First, the lower box body bottom plate and the lower box body end plate are welded to form a lower box body structure.

[0113] Then, the bottom first positioning part and the bottom second positioning part are respectively fixed to the middle and side of the lower box body by welding or bonding to form four cell installation spaces 8, and each cell installation space 8 is used to place one cell stack 5, as shown in Figure 3 .

[0114] Then, the bottom of the cell mounting space 8 is pasted with adhesive (for example, existing thermal conductive structural adhesive), and then the cell stack 5 is sequentially placed into the cell mounting space according to Figure 4 The bottom of the cell stack 5 is pasted with the top surface of the bottom plate of the lower box.

[0115] Then, the cell beam end plate 3 is placed at the end of the cell stack, and then the fixing part of the elastic part is fixed in the limiting groove 301 of the fixing part of the cell beam end plate 3 by bolts, as shown in Figure 2 .

[0116] Finally, the upper box 1 and the lower box 2 are fixed and connected at the top by using bolts, as shown in Figure 1 .

[0117] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can make several improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A battery system characterized by, The lower box (2) is hollow and open at the top; The top of the lower box (2) is covered by the upper box (1); The inner cavity of the lower box (2) is provided with a first battery cell module and a second battery cell module on the left and right sides, respectively; The first battery cell module and the second battery cell module are symmetrically distributed on the left and right sides; The first battery cell module and the second battery cell module each include two battery cell stacks (5); Each battery cell stack (5) includes a plurality of battery cell monomers (502) distributed horizontally and arranged longitudinally in parallel; For each battery cell stack (5), any two adjacent battery cell monomers (502) are provided with a battery cell interfill plate (501) therebetween; The bottom of each battery cell stack (5) is bonded to the top surface of the bottom of the lower box (2); Between the two battery cell stacks (5) in the first battery cell module and between the two battery cell stacks (5) in the second battery cell module, a bottom first positioning component (6) is arranged transversely; The opposite side of the first battery cell module and the second battery cell module is vertically provided with a longitudinal distribution of a battery cell longitudinal beam end plate (3); The longitudinal middle position of the opposite side of the two battery cell longitudinal beam end plates (3) is connected vertically by a transversely distributed elastic component (4); The elastic component (4) includes two longitudinally distributed fixed parts (401) and a transversely distributed elastic part (402); The two fixed parts (401) are transversely spaced and connected vertically by the elastic part (402) at the middle of the opposite side thereof; Each fixed part (401) includes a longitudinally distributed elastic component fixing plate (4011); The lower middle position of the elastic component fixing plate (4011) is provided with an elastic component mounting slot (4012) opening downward; The elastic part (402) includes a transversely distributed end elastic plate (4022); The top front side and rear side of the end elastic plate (4022) are respectively provided with at least one transversely distributed middle elastic strip (4023); The left and right sides of the end elastic plate (4022) are respectively provided with an elastic part mounting block (4021); The elastic part mounting block (4021) is connected with the elastic component mounting slot (4012) in the fixed part (401).

2. The battery system of claim 1, wherein, The front and rear sides of the lower box (2) are vertically provided with a lower box bottom plate (201); The left and right sides of the lower box (2) are vertically provided with a lower box end plate (202); Each lower box bottom plate (201) is fixedly provided with a bottom second positioning component (7) on the side bottom facing each battery cell stack (5) by welding or bonding connection.

3. The battery system of claim 2, wherein, The transverse length of the bottom second positioning component (7) is equal to the transverse length of the battery cell stack (5); The longitudinal section shape of each bottom second positioning component (7) is L-shaped.

4. The battery system of claim 2, wherein, Each bottom second positioning component (7) includes a transversely distributed bottom second positioning component mounting block (701); The bottom second positioning component mounting block (701) is perpendicular to the lower box bottom plate (201); The outer side of the bottom second positioning component mounting block (701) is connected with the lower box end plate (202) by welding or bonding connection; The top of the bottom second positioning component mounting block (701) is provided with horizontally distributed bottom second positioning component positioning blocks (702); The bottom surface of the bottom second positioning component positioning block (702) is bonded with the top surface of the lower box bottom plate (201) by structural adhesive.

5. The battery system of claim 1, wherein, Each bottom first positioning component (6) comprises a bottom first positioning component mounting block (601) and a bottom first positioning component positioning block (602); The top of the horizontally distributed first positioning component mounting block (601) is vertically provided with a bottom first positioning component positioning block (602); The bottom surface of the first positioning component mounting block (601) is fixedly connected with the top surface of the bottom plate of the lower box (2) by welding or bonding connection.

6. The battery system according to any one of claims 1 to 5, wherein Two cell longitudinal beam end plates (3) are respectively provided with a fixed part limiting groove (301) at the longitudinal middle position of the opposite side. The fixed part limiting groove (301) is connected with the elastic part fixing plate (4011) of the fixed part (401) in the elastic part (4).

7. The battery system of claim 6, wherein, Each cell longitudinal beam end plate (3) is provided with a plurality of upper and lower through weight reduction holes (302).

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