Battery cell and battery module

Abstract

The utility model discloses a battery cell and a battery module. The battery cell module comprises a first battery cell and a second battery cell; a pole of the first battery cell extends outwards from the surface of the cover plate to form an extending pole, and a locking hole site is arranged on the extending pole; the first battery cell is also provided with an embedding groove on the surface of the cover plate, the embedding groove is positioned at the central symmetry position of the extension pole, a nut is pre-embedded in the embedding groove, and the polarity of the extension pole is opposite to that of the embedding groove; and the second battery cell and the first battery cell have a mirror symmetry structure. According to the utility model, rapid grouping and convenient disassembly of the battery cells are realized in a form of mutual matching of the extending poles and the embedding grooves, so that aluminum bar materials and a welding process of module assembly are omitted, and the production cost is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy batteries, and specifically relates to a battery core and a battery module. Background Art

[0002] The battery cells in the new energy industry can be roughly divided into three types according to their appearance: cylindrical battery cells, square battery cells and soft-pack battery cells. Among them, square battery cells have a relatively simple structure, good heat dissipation, simple and easy grouping, relatively high system energy density, and convenient installation of explosion-proof valves, which is safer, so they are more popular in China.

[0003] At present, most of the square cells in the industry have positive and negative poles (Z direction) extending from the cover plate. The materials used for the cover plate (metal, plastic) are various, which makes a single cell have a lot of materials and increases the cost. At the same time, the existence of the Z-direction pole also causes the original space of the cell to be compressed and the energy density to be reduced. Most of the group connection of the cell is through laser welding of the aluminum busbar and the cell pole, which has the following problems:

[0004] 1. The aluminum bars increase the weight and volume of the battery cell group, which reduces the mass energy density and volume energy density of the module;

[0005] 2. Different overcurrent requirements require the design of aluminum bars with different cross-sectional areas, which increases the amount of materials and makes it difficult to control incoming materials and production;

[0006] 3. It is difficult to disassemble the battery pole and aluminum bar after welding, and it is a destructive disassembly, which will damage the surface flatness of the pole;

[0007] 4. After the battery cell is squeezed and fixed, there is another aluminum bar welding process. The increase in the process lengthens the module assembly time and reduces production efficiency.

[0008] 5. The aluminum bar welding process requires laser welding equipment, which has high equipment cost and certain equipment maintenance cost;

[0009] 6. During the early stage of manual sample verification, it is easy to get the polarity wrong when the battery cells are grouped, resulting in a short circuit inside the battery module, causing personnel safety risks. Utility Model Content

[0010] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a battery cell and a battery module to solve the problems in the above-mentioned background technology.

[0011] One of the technical solutions adopted by the utility model to solve its technical problem is: providing a battery cell, the pole of the battery cell extends outward from the cover surface to form a protruding pole, and the protruding pole is provided with a locking hole; the battery cell is also provided with an embedding groove on the cover surface, the embedding groove is located at a central symmetrical position of the protruding pole, a nut is embedded in the embedding groove, and the polarity of the protruding pole is opposite to that of the embedding groove.

[0012] In the utility model, the protruding pole protrudes outwards in parallel along the surface of the cover plate of the battery cell.

[0013] In the utility model, the end of the protruding pole extends downward to form a barb.

[0014] In the utility model, a locking structure is provided in the embedding groove.

[0015] In the utility model, the locking structure includes a slot having a depth matching that of the barb.

[0016] In the utility model, a buckle, a spring slider or a spring sheet is arranged in the slot.

[0017] In the utility model, the nut is used to connect the collection device, and the collection device passes through the locking hole and is fixed to the nut.

[0018] In the present utility model, the battery core is a square battery core.

[0019] The second technical solution adopted by the utility model to solve its technical problem is: providing a battery module, including a first battery cell and a second battery cell, the first battery cell and the second battery cell are the above-mentioned battery cells, and the two are mirror-symmetrical structures to each other; the battery cells are connected by clamping the protruding pole of the first battery cell and the embedded groove of the second battery cell to achieve current conduction.

[0020] In the utility model, the battery module comprises a plurality of first battery cells and second battery cells connected in sequence along the length, thickness or height direction, so that the output surface can be on the upper surface, side surface or lower surface of the battery module.

[0021] Compared with the background technology, this technical solution has the following advantages:

[0022] 1. The battery module of this scheme is provided with a first battery cell and a second battery cell, which are mirror-symmetrical structures. The first battery cell and the second battery cell are directly connected to the embedded slot of another battery cell (with opposite polarity definition) through the extended pole, without the need for welding through a medium (aluminum bar), directly eliminating the cost of welding tooling and equipment, reducing weight and volume, so that the energy density of the module is improved, and at the same time, the time of the module on the assembly line is shortened, the offline process is accelerated, and the production efficiency is improved; the mirror-symmetrical structure enables the battery cells to have error-proof characteristics when connected in groups, and it is not easy to cause short circuits and safety risks;

[0023] 2. The extended pole of this solution is flush with the surface of the cover plate. After the battery cells are connected, there is no pole protruding from the aluminum bar and the cover plate. The upper part of the battery cell is flat and has a smooth appearance, which effectively solves the problem that the pole of the battery cell in the existing solution extends upward from the cover plate and occupies the Z-direction space after connecting the aluminum bar and welding. In addition, when the battery cells are grouped, the extended pole can be placed at the bottom, which provides more options for the module layout of the battery pack and solves the problem that the existing solution of battery cell grouping only has poles facing upward and the pole side-out solution limits the module layout;

[0024] 3. In this solution, the two battery cells are matched with each other by the extended pole and the embedded groove to achieve rapid grouping and convenient disassembly of the battery cells. The matching methods can be in various forms, including but not limited to interlocking buckles, spring sliders, bent spring sheets, etc., and the design is ductile; it effectively solves the problem that the battery cells of the existing solution are only connected by external aluminum bars, and the design is single and homogeneous, and effectively avoids the problem that once the aluminum bar welding process is carried out after grouping, the battery cells are difficult to disassemble, and the surface of the battery pole becomes uneven due to the peeling of the aluminum bar after violent disassembly, which affects the secondary use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a three-dimensional diagram of the battery cell of Example 1;

[0027] Figure 2 This is a top view of the battery cell of Example 1;

[0028] Figure 3 This is a side view of the battery cell of Example 1;

[0029] Figure 4 This is a structural diagram of the first battery cell and the second battery cell of Example 1;

[0030] Figure 5 This is a diagram showing the connection method of the first battery cell and the second battery cell in Example 1;

[0031] Figure 6 This is a structural diagram of the battery module of Example 1;

[0032] Figure 7 This is a structural diagram of the battery module connected to the collection device in Example 1;

[0033] Figure 8 This is a locking structure diagram of Example 1;

[0034] Fig. 9 This is the locking structure diagram of Example 2.

[0035] Among them, 1-first battery cell, 11-extending pole, 12-barb, 13-locking hole, 14-embedding groove, 15-nut, 16-slot, 17-slider, 18-spring, 19-bent spring, 2-second battery cell, 3-collection device. DETAILED DESCRIPTION

[0036] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0037] Example 1

[0038] A battery cell is a square battery cell. The pole of the battery cell extends outward from the surface of the cover plate to form a protruding pole 11, and a locking hole 13 is provided on the protruding pole 11; the battery cell is also provided with an embedding groove 14 on the surface of the cover plate, and the embedding groove 14 is located at a central symmetrical position of the protruding pole 11, and a nut 15 is pre-embedded in the embedding groove 14, and the polarity of the protruding pole 11 is opposite to that of the embedding groove 14.

[0039] This embodiment also provides a battery module, including a plurality of first battery cells 1 and second battery cells 2 having the above-mentioned battery cell structure and being mirror-symmetrical structures. When grouping, the protruding pole 11 of the first battery cell 1 is inserted into the embedding groove 14 of the second battery cell 2 to complete the electrical connection, and the battery cell module can be quickly grouped and conveniently disassembled between the two battery cells. The nut 15 is used to connect the voltage or temperature acquisition device 3, and the lead of the acquisition device 3 is fixed by screwing through the locking hole 13 and locking with the nut 15.

[0040] The protruding pole 11 protrudes outward parallel to the upper surface of the cover plate of the first battery cell 1 or the second battery cell 2, and the end of the protruding pole 11 extends downward to form a barb 12. Correspondingly, a locking structure is provided in the embedding groove 14, and the locking structure includes a card slot 16 with a depth matching the barb 12. The material used for the protruding pole 11 should have a certain toughness, on the one hand, so that the hook part can be hung with the card slot 16, and the protruding pole 11 has a flush surface after being inserted into the embedding groove 14, and on the other hand, it can also prevent the protruding pole 11 from loosening or breaking under the battery cell cycle test.

[0041] In this embodiment, taking the example of a spring 18 and a slider 17 provided in the slot 16, the slider 17 is connected to the side wall of the slot 16 by the spring 18. After the barb 12 of the protruding pole 11 is inserted, it abuts against the inner wall of the barb 12 to prevent the barb 12 from falling out and increase stability.

[0042] Example 2

[0043] The difference between Example 2 and Example 1 is that in this embodiment, taking the bent spring piece 19 curled from the bottom upward and toward the hook 12 as an example, when the protruding pole 11 is inserted into the embedding groove 14, the hook 12 extends into the slot 16, and one end of the bent spring piece 19 in the slot 16 is pressed down by the hook 12, causing the other end to tilt toward the hook 12 to achieve abutment, thereby preventing the hook 12 from falling out and increasing stability.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that: The pole of the battery cell extends outward from the surface of the cover plate to form a protruding pole, and a locking hole is provided on the protruding pole; the battery cell is also provided with an embedding groove on the surface of the cover plate, and the embedding groove is located at a central symmetrical position of the protruding pole, a nut is embedded in the embedding groove, and the polarity of the protruding pole is opposite to that of the embedding groove; the protruding pole extends outward parallel to the cover surface of the battery cell; the end of the protruding pole extends downward to form a barb; a locking structure is provided in the embedding groove; the locking structure includes a slot with a depth matching the barb.

2. A battery cell according to claim 1, characterized in that: A buckle, a spring slider or a spring sheet is arranged in the slot.

3. A battery cell according to claim 1, characterized in that: The nut is used to connect the collection device, and the collection device passes through the locking hole and is fixed to the nut.

4. A battery cell according to claim 1, characterized in that: The battery cell is a square battery cell.

5. A battery module, characterized in that: The invention comprises a first battery cell and a second battery cell, wherein the first battery cell and the second battery cell are the battery cells as claimed in any one of claims 1 to 4, and the two are mirror-symmetrical structures to each other; the protruding pole of the first battery cell and the embedded groove of the second battery cell are clamped to realize current conduction.

6. A battery module according to claim 5, characterized in that: It includes a plurality of first battery cells and a plurality of second battery cells connected in sequence along the length, thickness or height direction.

Images