Battery with two externally-expanded ends

Abstract

The battery comprises a shell, a battery cell arranged in the shell, a positive electrode cover plate assembly and a negative electrode cover plate assembly which are respectively arranged at the two ends of the shell, a positive electrode post and a negative electrode post, the shell comprises a cylinder, a first horn, a second horn, a first square cylinder and a second square cylinder, the first horn and the first square cylinder are sequentially connected outwards along one end of the cylinder, and the second horn and the second square cylinder are sequentially connected outwards along the other end of the cylinder; the length of the cylinder is 0.4-0.8 of the length of the shell; in the side view projection direction, the first horn is located in the first square cylinder, the cylinder is located in the first horn, the second horn is located in the second square cylinder, and the cylinder is located in the second horn. Compared with the prior art, the battery provided by the utility model has a stable structure and has more internal space for storing gas.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery with expanded ends. Background Art

[0002] The electrochemical reactions that occur during the charge and discharge process of existing batteries, as well as side reactions caused by battery aging or damage, can lead to the generation of chemical gases inside. When the gas reaches a certain level, it can cause the battery to bulge or even explode. For example, after the battery cells are installed in the cylindrical shell of a cylindrical battery, the remaining space inside the cylindrical shell is small, insufficient to accommodate the chemical gases. Therefore, when the internal gas reaches its limit, it is prone to bulging and explosion. In square cylindrical batteries, the weakest area is located in the middle of each surface. When chemical gases are present inside the shell, the middle of each surface is prone to bulging. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a battery with expanded ends, which has a stable structure when facing internal gas and can store more chemical gas inside the shell.

[0004] To achieve the above objectives, the utility model discloses a two-end expanded type battery, comprising a housing, a battery cell installed in the housing, a positive electrode cover plate assembly and a negative electrode cover plate assembly respectively installed at two ends of the housing, a positive electrode post and a negative electrode post;

[0005] The housing includes a cylindrical tube, a first horn tube, a second horn tube, a first square tube, and a second square tube. The first horn tube and the first square tube are sequentially connected outwardly along one end of the cylindrical tube, and the second horn tube and the second square tube are sequentially connected outwardly along the other end of the cylindrical tube.

[0006] The length of the cylindrical tube is 0.4 to 0.8 of the length of the outer shell;

[0007] In the direction of side projection, the first horn is located in the first square tube, the cylindrical tube is located in the first horn, the second horn is located in the second square tube, and the cylindrical tube is located in the second horn.

[0008] Preferably, the cylindrical tube, the first horn tube, the second horn tube, the first square tube and the second square tube are integrally formed by stamping.

[0009] Preferably, in the direction of side projection, the cross-sectional shape of the cylindrical tube inscribes the cross-sectional shapes of the first square tube and the second square tube.

[0010] Preferably, the first square tube and / or the second square tube have rounded corners.

[0011] Preferably, a current collecting member is provided between the battery core and the positive electrode column and the negative electrode column, and the current collecting member is located in the corresponding square tube.

[0012] Preferably, a QR code is provided on the outer wall of the positive electrode cover plate assembly and / or the negative electrode cover plate assembly and / or the outer shell.

[0013] Preferably, the length of the cylindrical tube is 0.6 of the length of the outer shell.

[0014] Preferably, the first horn and the second horn have the same shape and size, and / or the first square tube and the second square tube have the same shape and size.

[0015] Preferably, the centers of the cylindrical tube, the first horn tube, the second horn tube, the first square tube and the second square tube are coaxially arranged.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The shell includes a cylindrical tube, a first horn tube and a first square tube arranged at one end of the cylindrical tube, and a second horn tube and a second square tube arranged at the other end of the cylindrical tube, wherein the length of the cylindrical tube is 0.4 to 0.8 of the length of the outer shell. During use, if chemical gas is generated inside the shell, the cylindrical tube can provide a more uniform pressure distribution when the internal pressure increases compared to the square structure, so that the cylindrical tube has better internal pressure resistance, a more stable structure, and reduced risk of bulging.

[0018] In addition, square tubes are provided at both ends of the cylindrical tube. In the direction of the side projection, the cylindrical tube is located inside the corresponding square tube, that is, the cross-sectional area of ​​the square tube is larger than the cross-sectional area of ​​the cylindrical tube. Compared with traditional cylindrical batteries, the internal space of the shell is increased. Under the same conditions, the amount of electrolyte injected into the battery is certain. The above increases the internal space of the shell, which allows more space in the shell to store chemical gases and alleviates the problem of bulging. The cross-sectional dimensions of the above square tubes also ensure that the entire shell has a suitable size, avoiding the problem of the battery becoming larger in size after the module is formed due to the shape change of the horn tube and the square tube.

[0019] Since the cross-sectional shape of the cylindrical tube is circular and the cross-sectional shape of the first square tube is square, the two shapes are different, which is not conducive to processing. This application connects the two by setting a horn tube, which facilitates the processing of the two, reduces the processing difficulty, and improves the processing efficiency. In addition, the internal volume of the horn tube is also larger than the internal volume of the cylindrical tube of the same length, so that the shell has a larger internal space to store chemical gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a battery with expanded ends in the present invention;

[0021] Figure 2 for Figure 1 Exploded view of the battery;

[0022] Housing 1; cylindrical tube 11; first horn tube 12; second horn tube 13; first square tube 14; second square tube 15;

[0023] Battery cell 2;

[0024] Positive electrode cover plate assembly 3;

[0025] Negative electrode cover plate assembly 4;

[0026] Positive electrode 5;

[0027] Negative electrode 6;

[0028] Current collecting piece 7. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] A battery with two expanded terminals, see Figure 1-Figure 2 , including a shell 1, a battery cell 2 installed in the shell 1, a positive cover assembly 3 and a negative cover assembly 4 respectively installed at both ends of the shell 1, a positive electrode post 5 and a negative electrode post 6, wherein the battery cell 2, the positive cover assembly 3, the negative cover assembly 4, the positive electrode post 5 and the negative electrode post 6 all adopt the existing structure and are not repeated here.

[0031] In this embodiment, the housing includes a cylindrical tube 11, a first horn tube 12, a second horn tube 13, a first square tube 14, and a second square tube 15. The first horn tube 12 and the first square tube 14 are sequentially connected outwardly along one end of the cylindrical tube 11, and the second horn tube 13 and the second square tube 15 are sequentially connected outwardly along the other end of the cylindrical tube 11. In side projection, the first horn tube 12 is located within the first square tube 14, the second horn tube 13 is located within the second square tube 15, and the cylindrical tube 11 is located within the first horn tube 12 and the second horn tube 13. Thus, the two horn tubes and the square tube are connected to the interior space of the cylindrical tube 11, forming a space for mounting the battery cell 2.

[0032] The length of cylindrical tube 11 is 0.4 to 0.8 times the length of the outer shell. During use, if chemical gases are generated within the shell, cylindrical tube 11 can provide more uniform pressure distribution when the internal pressure increases compared to a square structure. This makes cylindrical tube 11 more resistant to internal pressure, more structurally stable, and reduces the risk of bulging. Preferably, the longer the length of cylindrical tube 11, the more it becomes the main structure of the outer shell, which can further improve the structural stability of the outer shell.

[0033] A square tube is provided at both ends of the cylindrical tube. In the direction of the side projection, the cylindrical tube is located inside the corresponding square tube, that is, the cross-sectional area of ​​the square tube is larger than the cross-sectional area of ​​the cylindrical tube. Compared with traditional cylindrical batteries, the internal space of the shell is increased. Under the same conditions, the amount of electrolyte injected into the battery is certain. The above increases the internal space of the shell, which allows more space in the shell to store chemical gases and alleviates the problem of bulging. The cross-sectional size of the above square tube also ensures that the entire shell 1 has a suitable size, avoiding the problem of the battery forming a module due to the shape change of the horn tube and the square tube causing the entire module volume to increase.

[0034] Since the cross-sectional shape of the cylindrical tube 11 is circular and the cross-sectional shape of the first square tube 14 is square, the two shapes are different, which is not conducive to processing. The present application connects the two by setting a horn tube, which facilitates the processing of the two, reduces the processing difficulty, and improves the processing efficiency. In addition, the internal volume of the horn tube is also larger than the internal volume of the cylindrical tube 11 of the same length, so that the shell has a larger internal space for storing chemical gases.

[0035] In this embodiment, the length of the cylindrical tube 11 is preferably 0.6 of the length of the housing. As for the horn tube and the square tube at each end of the housing, they can be 0.1 to 0.3 of the length of the housing.

[0036] In this embodiment, the cylindrical tube 11, the first horn tube 12, the second horn tube 13, the first square tube 14, and the second square tube 15 are integrally formed by stamping. This ensures the structural strength of the entire housing 1, while reducing processing costs and improving processing efficiency. The rounded corners of the first and second square tubes 14, 15 facilitate the integral molding of a square structure, improving molding quality and avoiding the problem of cracking at the corners caused by forming a right-angled structure.

[0037] In this embodiment, in the direction of side projection, the cross-sectional shape of the cylindrical tube 11 inscribes the cross-sectional shapes of the first square tube 14 and the second square tube 15. In this way, during the module formation process, the cylindrical tube 11 is installed in the module frame, and the horn tubes and square tubes at both ends are exposed to the outside. Compared with the module formed by the existing cylindrical battery structure, this will not increase the module volume while alleviating the risk of existing battery swelling.

[0038] In this embodiment, a current collector 7 is provided between the battery cell 2 and the positive and negative electrode posts 5 and 6. This current collector 7 is located within the corresponding square tube. This placement of the current collector 7 within the square tube allows for a larger size, which, compared to the larger current collector 7 in conventional batteries, allows for a higher charge and discharge rate and improves charging efficiency.

[0039] In order to facilitate understanding of battery information, a QR code is provided on the outer wall of the positive cover plate assembly 3 and / or the negative cover plate assembly 4 and / or the shell 1. In this embodiment, the QR code is provided on the cover plate.

[0040] In this embodiment, the first horn 12 and the second horn 13 have the same shape and size, and the first square tube 14 and the second square tube 15 have the same shape and size, which can unify the specifications of the housing 1, facilitate use, and facilitate processing.

[0041] In this embodiment, the centers of the cylindrical tube 11, the first horn tube 12, the second horn tube 13, the first square tube 14 and the second square tube 15 are coaxially arranged, so that the overall shape of the entire shell 1 is regular, easy to use, and has a good appearance.

[0042] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery with two expanded ends, characterized by: It includes a housing, a battery cell installed in the housing, a positive electrode cover assembly and a negative electrode cover assembly respectively installed at both ends of the housing, a positive electrode post and a negative electrode post; The housing includes a cylindrical tube, a first horn tube, a second horn tube, a first square tube, and a second square tube. The first horn tube and the first square tube are sequentially connected outwardly along one end of the cylindrical tube, and the second horn tube and the second square tube are sequentially connected outwardly along the other end of the cylindrical tube. The length of the cylindrical tube is 0.4 to 0.8 of the length of the outer shell; In the direction of side projection, the first horn is located in the first square tube, the cylindrical tube is located in the first horn, the second horn is located in the second square tube, and the cylindrical tube is located in the second horn.

2. The battery with expanded ends according to claim 1, characterized in that: The cylindrical tube, the first horn tube, the second horn tube, the first square tube and the second square tube are integrally formed by stamping.

3. The battery with expanded ends according to claim 2, characterized in that: In the direction of side projection, the cross-sectional shape of the cylindrical tube inscribes the cross-sectional shapes of the first square tube and the second square tube.

4. The battery with expanded ends according to claim 2, characterized in that: The corners of the first square tube and / or the second square tube are rounded.

5. The battery with expanded ends according to claim 1, characterized in that: A current collecting member is provided between the battery core and the positive electrode column and the negative electrode column, and the current collecting member is located in the corresponding square tube.

6. The battery with expanded ends according to claim 1, characterized in that: A QR code is provided on the outer wall of the positive electrode cover plate assembly and / or the negative electrode cover plate assembly and / or the outer shell.

7. The battery with expanded ends according to claim 1, characterized in that: The length of the cylindrical tube is 0.6 of the length of the outer shell.

8. The battery with expanded ends according to claim 1, characterized in that: The first horn and the second horn have the same shape and size, and / or the first square tube and the second square tube have the same shape and size.

9. The battery with expanded ends according to claim 1, characterized in that: The centers of the cylindrical tube, the first horn tube, the second horn tube, the first square tube and the second square tube are coaxially arranged.

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