Battery shell and module

Abstract

The utility model provides a battery case and a module, and belongs to the field of battery case manufacturing. The battery shell comprises a conductive shell body, a sealing part and a sealing medium, the conductive shell body comprises a first shell body and a second shell body, the conductive shell body is formed by folding and connecting the first shell body and the second shell body, the sealing part is arranged at the folding joint of the first shell body and the second shell body, a groove is formed in the folding joint of the first shell body and the second shell body, and the sealing medium is arranged in the groove. The two opposite sides of the sealing part are provided with protrusions matched with the grooves, the sealing medium is arranged between the grooves and the protrusions, the first shell is provided with a first conductive part, and the second shell is provided with a second conductive part. By adopting the battery shell provided by the embodiment of the utility model, the problem of low structural strength of the battery shell in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the field of battery shell manufacturing, in particular to a battery shell and a module. Background Art

[0002] There are many types of battery shells, in terms of shape, they are square, cylindrical, diamond, triangular, etc. Cylindrical and square are more mass-produced, and the square battery shell is a structure with at least one end open, and the battery pole is external. For the new battery shell, the battery pole is built-in, and the battery shell needs to be used as the battery structure.

[0003] The new battery shells in the prior art are assembled by adding sealing materials such as rubber between the shells, heating them, and melting the sealant to seal the shells. This is completely fine from the perspective of the airtightness of the battery.

[0004] However, the sealing form of the battery shell in the prior art will reduce the structural strength of the battery shell, resulting in low structural strength of the battery shell. Utility Model Content

[0005] The embodiment of the utility model provides a battery shell and a module, which can solve the problem of low structural strength of battery shells in the prior art. The technical solution is as follows:

[0006] In a first aspect, a battery case includes: a conductive shell, a sealing portion and a sealing medium,

[0007] The conductive shell includes a first shell and a second shell, and the conductive shell is formed by the first shell and the second shell being coupled and connected. The sealing portion is arranged at the coupling joint between the first shell and the second shell, and the first shell and the second shell are provided with a groove at the coupling joint. The opposite sides of the sealing portion are provided with protrusions matching the groove, and the sealing medium is arranged between the groove and the protrusion. The first shell is provided with a first conductive portion, and the second shell is provided with a second conductive portion.

[0008] Optionally, a plurality of grooves are provided and arranged in parallel and at intervals.

[0009] Optionally, a plurality of the grooves are provided, and the plurality of grooves are arranged in a stepped manner.

[0010] Optionally, the sealing portion includes a first welding portion, a second welding portion and a weld mark, the weld mark is arranged between the first welding portion and the second welding portion, and the first welding portion and the second welding portion are symmetrically arranged.

[0011] Optionally, the sealing medium is rubber and / or plastic, polytetrafluoroethylene, or polyurethane melt.

[0012] Optionally, an explosion-proof valve is further included, and the explosion-proof valve is arranged on the conductive shell.

[0013] Optionally, a liquid injection hole is further included, and the liquid injection hole is arranged on the conductive shell.

[0014] In a second aspect, a battery shell module is provided, based on the aforementioned battery shell, characterized in that it comprises a plurality of the battery shells, and the conductive shell of each battery shell is in contact with the conductive shell of another battery shell.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the utility model include at least:

[0016] A battery shell and module provided by an embodiment of the utility model, by adding a sealing portion structure between a first shell and a second shell, the first shell and the second shell are not only sealed and connected by a sealing medium, thereby strengthening the structural strength between the first shell and the second shell, so that the assembled conductive shell is more structurally stable when subjected to forces in different directions, and can effectively solve the problem of low structural strength of battery shells in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the utility model;

[0019] Figure 2 It is an enlarged schematic diagram of the sealing part structure provided by an embodiment of the utility model;

[0020] Figure 3 It is an enlarged schematic diagram of another sealing part structure provided by an embodiment of the utility model;

[0021] Figure 4 It is an enlarged schematic diagram of another sealing part structure provided by an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the battery shell module structure provided by an embodiment of the utility model.

[0023] In the figure: 1-conductive shell; 11-first shell; 111-first conductive part; 12-second shell; 121-second conductive part; 2-sealing part; 21-first welding part; 22-second welding part; 23-welding mark; 3-sealing medium; 4-groove; 5-protrusion; 6-explosion-proof valve; 7-liquid injection hole; 81-first battery shell; 82-second battery shell; 83-third battery shell. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the utility model; Figure 2 It is an enlarged schematic diagram of the sealing part structure provided by an embodiment of the utility model; Figure 3 It is an enlarged schematic diagram of another sealing part structure provided by an embodiment of the utility model; Figure 4 It is an enlarged schematic diagram of another sealing part structure provided by an embodiment of the utility model; Figure 5 Schematic diagram of the battery housing module structure provided by the embodiment of the utility model. Figures 1 to 5 A battery shell shown in the figure includes: a conductive shell 1, a sealing part 2 and a sealing medium 3, the conductive shell 1 includes a first shell 11 and a second shell 12, the conductive shell 1 is formed by the first shell 11 and the second shell 12 being connected and formed, the sealing part 2 is arranged at the connection between the first shell 11 and the second shell 12, the first shell 11 and the second shell 12 are provided with a groove 4 at the connection, the opposite sides of the sealing part 2 are provided with a protrusion 5 matching the groove 4, the sealing medium 3 is arranged between the groove 4 and the protrusion 5, the first shell 11 is provided with a first conductive part 111, and the second shell 12 is provided with a second conductive part 121.

[0026] For example, in the embodiment of the utility model, the first conductive part 111 and the second conductive part 121 can be a structure recessed into the conductive housing 1, so that the first conductive part 111 and the second conductive part 121 can directly serve as poles and connect to the battery core, or can be a structure protruding out of the conductive housing 1, with a pole rod connected to the protruding part to connect to the battery core. Figure 1As shown, the first conductive part 111 and the second conductive part 121 are inwardly concave structures. When assembling the conductive shell 1, first place the second shell 12 with its opening facing upward on the workbench. After placing the battery cell into the conductive shell 1, the second conductive part 121 is connected to the positive or negative electrode of the battery cell. After placing the sealing part 2 at the joint, the groove 4 on the second shell 12 is matched with the protrusion 5 on the sealing part 2. The gap between the groove 4 and the protrusion 5 is fixed to 1.5 mm. At this time, the sealing medium 3 is injected into the gap so that the second shell 12 is connected and fixed to the sealing part 2. Then, the first shell 1 is assembled. 1 is inverted on the second shell 12, so that the first conductive part 111 is connected to the positive or negative electrode of the battery cell. At this time, the groove 4 on the first shell 11 is matched with the protrusion 5 on the sealing part 2, and the gap between the groove 4 and the protrusion 5 is fixed to 1.5 mm. At this time, the sealing medium 3 is injected into the gap, so that the first shell 11 and the sealing part 2 are connected and fixed together, and the sealing of the conductive shell is completed. The first shell 11 and the second shell 12 become the positive or negative pole of the battery cell due to their conductive properties. The battery cell can be charged and discharged only by contacting the conductive shell 1 with external equipment.

[0027] A battery shell provided by an embodiment of the utility model adds a sealing portion 2 between a first shell 11 and a second shell 12, so that the first shell 11 and the second shell 12 are not only sealed and connected by a sealing medium 3, but also strengthens the structural strength between the first shell 11 and the second shell 12, so that the assembled conductive shell 1 is more structurally stable when subjected to forces in different directions, and can effectively solve the problem of low structural strength of battery shells in the prior art.

[0028] Optionally, a plurality of grooves 4 are provided and arranged in parallel and at intervals.

[0029] For example, in the embodiment of the present utility model, Figure 3 As shown, on the mating connection surfaces of the first shell 11 and the second shell 12, the grooves 4 are arranged in parallel and spaced apart, and the sealing portion 2 is provided with protrusions 5 matching the grooves 4. By providing multiple grooves 4 and multiple protrusions 5 for matching, the matching strength between the sealing portion 2 and the first shell 11 and the second shell 12 is improved, thereby improving the matching strength between the first shell 11 and the second shell 12, thereby further improving the structural strength of the battery shell.

[0030] Optionally, a plurality of grooves 4 are provided, and the plurality of grooves 4 are arranged in a stepped manner.

[0031] For example, in the embodiment of the present utility model, Figure 4As shown, the groove 4 is arranged in a stepped manner, and a protrusion 5 matching the groove 4 is provided on the sealing portion 2. Through the cooperation between the stepped groove 4 and the protrusion 5, the sealing portion 2 has a higher connection strength when the first shell 11 and the second shell 12 are matched, thereby improving the matching strength of the first shell 11 and the second shell 12, thereby further improving the structural strength of the battery shell.

[0032] Optionally, the sealing portion 2 includes a first welding portion 21 , a second welding portion 22 and a welding mark 23 , the welding mark 23 is arranged between the first welding portion 21 and the second welding portion 22 , and the first welding portion 21 and the second welding portion 22 are symmetrically arranged.

[0033] Exemplarily, in an embodiment of the utility model, the sealing part 2 is disassembled into a first welding part 21, a second welding part 22 and a weld mark 23. When the sealing part 2 is sealed and connected to the first shell 11 and the second shell 12 respectively, the first shell 11 can be placed on a workbench with its opening facing upward, the protrusion 5 of the first welding part 21 is matched with the groove 4 of the first shell 11 and the sealing medium 3 is injected. The second shell 12 is also placed on a workbench with its opening facing upward, the protrusion 5 of the second welding part 22 is matched with the groove 4 of the first shell 11 and the sealing medium 3 is injected. Due to the matching shape of the groove 4 and the protrusion 5, the first shell 11 and the second shell 12 are both opened upward to match the sealing part 2 through the sealing medium 3. Under the action of gravity, the sealing medium 3 can flow more smoothly to avoid uneven distribution of the sealing medium 3 at the matching connection between the groove 4 and the protrusion 5. After the first shell 11 is matched with the first welding part 21, and the second shell 12 is matched with the second welding part 22, the assembly of the first shell 11 and the first welding part 21 is inverted on the assembly of the second shell 12 and the second welding part 22, and a welding mark 23 is added between the two to weld the two assemblies together to complete the sealing of the conductive shell 1. The welding mark 23 is prepared by laser welding, and its mechanical strength is the same as that of the conductive shell 1. The battery shell prepared in this way has a high mechanical strength, which further improves the structural strength of the battery shell.

[0034] Optionally, the sealing medium 3 is rubber and / or plastic, polytetrafluoroethylene, or polyurethane melt.

[0035] Exemplarily, in an embodiment of the utility model, the first shell 11 or the second shell 12 and the sealing part 2 are first fixed with a fixed gap of 1.5 mm, and then one or more of rubber, plastic, polytetrafluoroethylene, and polyurethane are melted under high temperature conditions, and finally the molten material is poured into the gap and naturally cooled to obtain the sealing medium 3. Rubber, plastic, polytetrafluoroethylene, and polyurethane have the characteristics of high melting point and good adhesion performance. The sealing medium 3 uses such material to meet the use requirements of the battery shell, so that the sealing part 2 and the conductive shell 1 are more closely fitted, thereby improving the sealing performance of the battery shell.

[0036] Optionally, an explosion-proof valve 6 is further included, and the explosion-proof valve 6 is arranged on the conductive housing 1 .

[0037] For example, in the embodiment of the utility model, an explosion-proof valve 6 is provided. The fundamental reason for thermal runaway of the battery cell is that the exothermic side reaction inside the battery cell causes heat accumulation. The rate of heat exchange of the battery cell to the outside is less than the heat accumulation rate. The temperature continues to rise until it reaches the ignition point temperature, causing combustion and explosion. In order to prevent the occurrence of thermal runaway accidents and avoid the imbalance of pressure inside and outside the battery structure, and considering that a large amount of toxic gas will be instantly generated when a lithium battery catches fire, it is necessary to release the pressure and discharge the gas in a timely and directional manner. The explosion-proof valve 6 can achieve the requirements of maintaining the pressure balance inside and outside the battery structure and the directional release of gas, as a passive safety protection measure for preventing thermal runaway of the battery system. By providing the explosion-proof valve 6, the safety performance of the battery shell is improved.

[0038] Optionally, a liquid injection hole 7 is further included, and the liquid injection hole 7 is arranged on the conductive shell 1.

[0039] Illustratively, in an embodiment of the utility model, a liquid injection hole 7 is provided on the conductive shell 1, which is convenient for injecting electrolyte into the conductive shell 1 after the conductive shell 1 is installed and sealed. By providing the liquid injection hole 8, the convenience of operation of the present battery shell is improved.

[0040] A battery shell module, based on the aforementioned battery shell, comprises a plurality of battery shells, wherein the conductive shell 1 of each battery shell contacts the conductive shell 1 of another battery shell.

[0041] For example, in the utility model embodiment, multiple battery shells are combined into a battery shell module. Since the conductive shell 1 is made of conductive material, the first shell 11 and the second shell 12 are respectively connected to the positive and negative electrodes of the battery cell, so that the first shell 11 and the second shell 12 form the positive and negative electrodes of the battery structure. When the battery shell module is combined, the conductive shell 1 of multiple battery shells can be directly contacted with the conductive shell 1 of another battery shell to form a series structure or a parallel structure, so as to increase the total power of the entire battery structure. Figure 5 As shown in the figure, in the case where the upper side of the battery shell is connected to the positive electrode of the battery cell and the lower side is connected to the negative electrode of the battery cell, the first battery shell 81 and the second battery shell 82 are connected in series, and the first battery shell 81 and the third battery shell 83 are connected in parallel. By adjusting the first shell 11 and the second shell 12 in each battery structure to be connected to the positive and negative electrodes of the battery cell respectively, the series-parallel structure in the battery shell module is adjusted. The battery shell module set by this method reduces the use of structural parts in the battery assembly process and reduces the cost in the battery production process. At the same time, due to the reduction of redundant structural parts, the weight of the battery is reduced, thereby improving the energy density of the battery.

[0042] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery shell, characterized in that: include: A conductive housing (1), a sealing portion (2) and a sealing medium (3), The conductive shell (1) comprises a first shell (11) and a second shell (12); the conductive shell (1) is formed by the first shell (11) and the second shell (12) being joined together; the sealing portion (2) is arranged at the joint between the first shell (11) and the second shell (12); the first shell (11) and the second shell (12) are provided with a groove (4) at the joint; protrusions (5) matching the groove (4) are provided on opposite sides of the sealing portion (2); the sealing medium (3) is arranged between the groove (4) and the protrusion (5); the first shell (11) is provided with a first conductive portion (111); and the second shell (12) is provided with a second conductive portion (121).

2. A battery case according to claim 1, characterized in that: The grooves (4) are provided in plurality and are arranged in parallel and at intervals.

3. A battery case according to claim 1, characterized in that: A plurality of the grooves (4) are provided, and the plurality of grooves (4) are arranged in a stepped manner.

4. A battery case according to claim 1, characterized in that: The sealing portion (2) comprises a first welding portion (21), a second welding portion (22) and a welding mark (23); the welding mark (23) is arranged between the first welding portion (21) and the second welding portion (22); the first welding portion (21) and the second welding portion (22) are symmetrically arranged.

5. A battery case according to claim 1, characterized in that: The sealing medium (3) is rubber and / or plastic, polytetrafluoroethylene, or polyurethane melt.

6. A battery case according to claim 1, characterized in that: It also comprises an explosion-proof valve (6), wherein the explosion-proof valve (6) is arranged on the conductive housing (1).

7. A battery case according to claim 1, characterized in that: It also comprises a liquid injection hole (7), wherein the liquid injection hole (7) is arranged on the conductive shell (1).

8. A battery shell module, based on a battery shell according to any one of claims 1 to 7, characterized in that: The battery case comprises a plurality of the battery cases, wherein the conductive shell (1) of each battery case contacts the conductive shell (1) of another battery case.

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