Multi-battery module

Abstract

The utility model provides a multi-battery module, and relates to the technical field of batteries, at least two cavities are arranged in a shell, the cavities are separated from each other, each cavity is internally provided with a naked battery cell, and the two ends of the top of each naked battery cell are provided with tab groups which are respectively a positive tab group and a negative tab group; the top cover is mounted at the opening of the shell, a plurality of structural parts corresponding to the cavities in position and number are arranged in the top cover, each structural part comprises a backing ring, a connecting piece, an anti-explosion valve and a liquid injection hole, the connecting piece is electrically connected with the tab group, and a plurality of partition plates are fixed in the shell to separate the cavities; after the top cover and the shell are connected, each cavity is in a sealed state, one shell is provided with a plurality of battery cell groups, each component directly forms a module after being assembled, procedures are omitted, the cavities are partitioned by the partition plates, the occupied space is smaller than that of a plurality of battery cell shells which are arranged side by side, the effective space of the battery can be increased, and the service life of the battery is prolonged. Therefore, the overall energy density of the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a multi-battery module. Background Technology

[0002] In recent years, with the rapid development of new energy vehicles and energy storage systems, there are also higher requirements for battery module technology, requiring low production costs, simple manufacturing processes, and standardization of battery modules.

[0003] Currently, battery modules are made by welding multiple cells together in series and parallel through busbars. The manufacturing process is complicated and the space occupied by multiple cell casings arranged side by side is large, resulting in a reduction in effective battery space. There is an urgent need for an integration technology to directly assemble cell rolls into modules to meet the requirements of cost reduction and energy density improvement. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the battery module is formed by welding multiple cells in series and parallel through busbars, which reduces the effective battery space. In view of the problems existing in the prior art, a multi-battery module is provided.

[0005] The purpose and effects of this utility model are achieved by the following specific technical means:

[0006] A multi-battery module, comprising:

[0007] The housing has at least two cavities that are spaced apart from each other, and each cavity contains a bare battery cell. The top two ends of the bare battery cell are provided with tabs, which are a positive tab group and a negative tab group, respectively.

[0008] The top cover is installed at the opening of the housing. The top cover includes several structural components corresponding to the position and number of cavities. The structural components include gaskets, connecting pieces, explosion-proof valves and liquid injection holes. The connecting pieces are electrically connected to the electrode lugs.

[0009] A further preferred embodiment: the shell has several partitions fixed inside to create cavities, and after the top cover is connected to the shell, each cavity is sealed.

[0010] With this design, a shell structure can accommodate multiple batteries, and a top cover structure can enclose multiple battery cavities. The battery module is manufactured using an integrated process, eliminating cumbersome processing steps.

[0011] A further preferred embodiment: Each group of bare cells consists of two winding cores, and each winding core has tabs at both ends, namely a positive tab and a negative tab. The tabs of the same polarity are bent toward opposite faces, and their ends overlap and connect to form a tab group.

[0012] A further preferred embodiment: The top cover has several through-hole-shaped mounting grooves, which are pole post grooves and intermediate grooves. A gasket is provided in the pole post groove, and the bottom end of the gasket is provided with a protrusion, the bottom end of which is tightly connected to the pole post groove.

[0013] The explosion-proof valve and the injection port are installed in the mounting groove;

[0014] A further preferred embodiment: the center of the gasket ring has a through hole-shaped opening, which corresponds to the tab assembly. A connecting piece is embedded inside the gasket ring, and the connecting piece is L-shaped. The bottom end of the connecting piece is horizontal along the X-axis and closed at the bottom end of the opening.

[0015] This design uses a gasket ring instead of a traditional pole, which is simpler in structure and facilitates quick assembly.

[0016] A further preferred embodiment: the bottom of the top cover is provided with several supports, and the supports are snapped into the inner wall of the housing, and the supports are distributed at both ends of the outer side of the pole groove;

[0017] The supports at both ends of the same pole slot form a support group, and there is a gap of ≥1cm between the support groups;

[0018] This design, with multiple supports, facilitates precise positioning and a secure connection between the top cover and the housing, preventing the top cover from becoming loose.

[0019] A further preferred embodiment: the electrode assembly has a reserved groove at its center;

[0020] The reserved slot corresponds to the bracket assembly, and the connecting piece is electrically connected to the electrode assembly;

[0021] This design allows external equipment to easily insert itself into the pre-drilled slot to lift the tab assembly and make an electrical connection with the connecting piece.

[0022] A further preferred embodiment: the bare battery cells are arranged in parallel, and the positive electrode tabs and negative electrode tabs are arranged alternately, with adjacent positive electrode tabs and negative electrode tabs electrically connected by connecting pieces;

[0023] The ends of the connecting pieces overlap and are fixedly connected;

[0024] With this design, the connecting piece replaces the traditional busbar structure, and the electrical connection between the cells can be achieved by bending the connecting piece and welding it.

[0025] The beneficial effects of this utility model are:

[0026] Multiple cell groups are set in one casing. After the components are assembled, they can be directly combined into a module, eliminating the need for additional processes. Furthermore, the cavity is separated by partitions, which takes up less space than multiple cell casings placed side by side, thus increasing the effective space of the battery and improving the overall energy density of the battery pack. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the overall structure of this utility model (connecting pieces in connection state).

[0030] Figure 3 This is a schematic diagram of the assembly of the top cover and the bare battery cell structure of this utility model;

[0031] Figure 4 This is a schematic diagram showing the disassembled structure of the bare battery cell of this utility model;

[0032] Figure 5 This utility model Figure 4 Enlarged schematic diagram of the structure at point B in the diagram;

[0033] Figure 6 This is a schematic diagram of the top cover structure of this utility model (with the connecting piece not connected).

[0034] Figure 7 This is a schematic diagram showing the disassembled structure of the top cover and gasket ring of this utility model;

[0035] Figure 8 This is a front view of the top cover structure of this utility model;

[0036] Figure 9 This is a partial front view of the top cover structure of this utility model;

[0037] Figure 10 This is a schematic diagram of the gasket structure of this utility model;

[0038] Figure 11 This is a front view (split state) of the top cover and bare battery cell structure of this utility model.

[0039] Figure 12 This utility model Figure 1 A magnified schematic diagram of the structure at point A in the diagram.

[0040] Figures 1-12 In the middle: shell (1), cavity (101), bare cell (2), electrode assembly (201), reserved slot (202), top cover (3), mounting slot (301), gasket (4), protrusion (401), connecting piece (5). Detailed Implementation

[0041] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely examples for implementing this utility model. It must be pointed out that the disclosed embodiments do not limit the scope of this utility model. On the contrary, any modifications and refinements made without departing from the scope of this utility model are within the patent protection scope of this utility model.

[0042] Please see Figures 1-3 A multi-battery module, comprising:

[0043] The housing 1 has at least two cavities 101. Several partitions are fixed inside the housing 1 to separate the cavities 101. The partitions can be fixed to the housing 1 by welding or stamping. To ensure the connection between the partitions and the housing 1, the partitions are preferably made of the same material as the housing 1 (e.g., ...). Figure 2 As shown, the housing 1 is divided into four cavities 101 by three partitions. The dimensions of the cavities 101 can be the same or different. Those skilled in the art can design the specifications of the cavities 101 according to actual needs. Each cavity 101 is equipped with a bare battery cell 2. The size of the bare battery cell 2 should be designed to correspond to the size of the cavity 101 to be installed, so as to avoid the bare battery cell 2 being too small and causing it to shake inside the housing, or too large and unable to be smoothly installed in the housing.

[0044] Furthermore, each set of bare battery cells 2 consists of two wound cores, and each wound core has tabs at both ends of its top, namely a positive tab and a negative tab. The tabs of the same polarity are bent towards their opposite sides, and their ends overlap and connect to form a tab group 201. Each of the bare battery cell 2 has a tab group 201 at both ends of its top (e.g., ...). Figure 5 (As shown) The connection method for the electrode tabs can be riveting, ultrasonic pre-welding, laser welding, etc., as long as the two electrode tabs are firmly connected.

[0045] Please see Figure 3 and Figure 4 , Figures 6-11The top cover 3 includes several structural components corresponding to the position and number of cavities 101. These components include a gasket 4, a connecting piece 5, an explosion-proof valve, and a liquid injection hole. The connecting piece 5 is electrically connected to the electrode lug assembly 201. The top cover 3 has several through-hole-shaped mounting grooves 301, which are respectively electrode post grooves and intermediate grooves. A gasket 4 is placed in the electrode post groove, and the bottom end of the gasket 4 has a protrusion 401 that is tightly connected to the electrode post groove. The gasket 4 can be made of plastic or metal. When the gasket 4 is made of plastic, the protrusion 401 is connected and fixed to the electrode post groove by ultrasonic heat fusion. When the gasket 4 is made of metal, the protrusion 401 is connected and fixed to the electrode post groove by welding. The center of the gasket 4 has a through-hole-shaped opening corresponding to the electrode lug assembly 201. A connecting piece 5 is embedded inside the gasket 4, and the connecting piece 5 is L-shaped. The bottom end of the connecting piece 5 is horizontal along the X-axis and closed at the bottom end of the opening (e.g., ...). Figure 11 As shown), after the bare battery cells 2 are arranged side by side, they are connected to the top cover 3. The top cover 3 is placed above the bare battery cells 2. Each group of structural components corresponds to one bare battery cell 2. Several supports are provided at the bottom of the top cover 3. The supports are distributed at both ends of the outer side of the electrode slot. The supports at both ends of the outer side of the same electrode slot constitute a support group. After the top cover 3 is placed above the bare battery cells 2, the supports will be located outside the tab group 201. The center of the tab group 201 is provided with a reserved slot 202. The reserved slot 202 corresponds to the support group. There is a gap of ≥1cm between the support groups. The welding head of the external welding equipment is inserted into the reserved slot 202. The tab group 201 is slightly... Lift the tab assembly 201 upwards to make it fit tightly against the connecting piece 5, and then weld it to complete the connection. Of course, those skilled in the art can also use ordinary long and thin structures, such as hard metal plates with melting points greater than those of the tab assembly 201 and the connecting piece 5, and insert them into the reserved groove 202. Lift the tab assembly 201 upwards slightly to make it fit tightly against the connecting piece 5, and then perform ultrasonic welding or friction welding from the outer surface of the connecting piece 5. After welding is completed, the metal plate can be removed from the connecting piece 5. The design of the reserved groove 202 is to facilitate the welding operation of the tab assembly 201 and the connecting piece 5 and avoid poor welding.

[0046] Please see Figures 1-3 Pick up the top cover 3 and the bare battery cell 2 together, and adjust the bare battery cell 2 to the corresponding cavity 101 and place it into the cavity 101. As the bare battery cell 2 moves down, the top cover 3 will close the opening of the housing 1. Adjust the bracket and snap it into the inner wall of the housing 1. Multiple brackets facilitate the precise positioning and firm connection of the top cover 3 and the housing 1, preventing the top cover 3 from loosening. The top cover 3 and the housing 1 are fixed by welding. After the top cover 3 and the housing 1 are connected, each cavity 101 is in a sealed state. The positive electrode tab group 201 and the negative electrode tab group 201 are arranged alternately. Adjacent positive electrode tab groups 201 and negative electrode tab groups 201 are electrically connected by connecting pieces 5 (e.g. Figure 2The tab group 201 filled with diagonal lines shown is the negative electrode. Other tab groups 201 are positive electrodes. When connecting the connecting pieces 5, adjacent positive electrode connecting pieces 5 should be welded to the negative electrode connecting pieces 5 (e.g., ...). Figure 1 As shown in the figure, electrical connections are formed between the battery cells, thus assembling a battery module;

[0047] Furthermore, the explosion-proof valve and the injection hole are installed in the mounting groove 301. Both the explosion-proof valve and the injection hole are set on the auxiliary pad and are connected to the top cover 3 in the same way as the gasket 4. The explosion-proof valve plays the role of pressure relief and explosion prevention, while the injection hole facilitates the injection of electrolyte into the housing 1 in the later stage.

[0048] Multiple battery cell groups are set in a housing 1. After the components are assembled, they can be directly combined into a module, eliminating the need for a process. Moreover, the cavity 101 is separated by a partition, which takes up less space than multiple battery cell housings placed side by side, thereby increasing the effective space of the battery and thus increasing the overall energy density of the battery pack.

Claims

1. A multi-cell module, comprising: The application relates to a battery shell and a battery. The battery shell comprises a shell, at least two cavities are arranged in the shell, the cavities are blocked from each other, and a bare battery cell is arranged in each cavity; a top cover is arranged at an opening of the shell; the top cover comprises a plurality of structural members corresponding to the positions and numbers of the cavities; the structural members comprise a grommet, a connecting plate, an explosion-proof valve and a liquid injection hole; the connecting plate is electrically connected with the tab group; a plurality of through-hole-shaped mounting grooves are arranged in the top cover; the mounting grooves are pole column grooves and middle grooves; the grommet is arranged in the pole column groove; a convex part is arranged at the bottom end of the grommet; the bottom end of the convex part is tightly connected with the pole column groove; the explosion-proof valve and the liquid injection hole are arranged in the mounting groove; an opening is arranged in the center of the grommet; the opening corresponds to the tab group; the connecting plate is embedded in the grommet; the connecting plate is in an L shape; the bottom end of the connecting plate is in an X-axis horizontal state and is closed at the bottom end of the opening. A plurality of partitions are fixedly arranged in the shell to separate the cavities; the top cover is connected with the shell; each of the cavities is in a sealed state. Each of the bare battery cells is composed of two winding cores; the winding cores are provided with tabs at the two ends of the top part; the tabs are positive and negative; the tabs of the same polarity are bent towards opposite surfaces; the ends of the tabs are connected to form a tab group. A plurality of supports are arranged at the bottom of the top cover; the supports are clamped on the inner wall of the shell; the supports are arranged at the two ends of the outside of the pole column groove.

2. The multi-cell module of claim 1, wherein: The supports at the two ends of the outside of the same pole column groove form a support group; the support groups are separated by a gap of greater than 1 cm.

3. The multi-cell module of claim 1, wherein: A reserved groove is arranged in the center of the tab group; the reserved groove corresponds to the support group; the connecting plate is electrically connected with the tab group.

4. The multi-cell module of claim 1, wherein: The bare battery cells are arranged side by side; the positive and negative tab groups are arranged alternately; the adjacent positive and negative tab groups are electrically connected through the connecting plate. The ends of the connecting plates are fixedly connected.

5. A multi-cell module according to claim 4, wherein: ​ ​ 6. A multi-cell module according to claim 5, wherein: ​ ​

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