Secondary battery

Abstract

The utility model provides a secondary battery, which comprises a shell provided with an opening end; the top cover is provided with at least one inward concave groove, the top cover covers the open end of the shell, the shell and the top cover are enclosed to form an accommodating space, and the accommodating space is used for accommodating a naked battery cell; the number of the pole columns is two, the pole columns are respectively arranged at the positions of the grooves in the surface of the top cover, and the horizontal distance between the two pole columns is 0-600mm; according to the utility model, the conductive terminals of the battery are recessed inwards to improve the space utilization rate of the battery, and the resistance is reduced by reducing the current passing path, namely the internal resistance is reduced to reduce the self heat release of the battery so as to reduce the temperature rise of the battery.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion batteries, in particular to a secondary battery. Background Art

[0002] With the improvement of environmental awareness and the transformation of energy structure, the demand for new energy will continue to grow, and new energy electric vehicles, which are closely related to everyone, have naturally entered everyone's sight. People's major demands for new energy vehicles are mainly in two aspects: on the one hand, to improve the endurance; on the other hand, to ensure safety. At present, one way for new energy electric vehicles to improve the endurance in a limited space is to improve the space utilization rate. Therefore, major battery and battery pack manufacturers have flocked to the wave of CTP, CTC and other forms, the essence of which is to improve the space utilization rate. In addition, the most prominent aspect of electric vehicle safety is the thermal runaway of the battery, and the large internal resistance of the large battery cell will cause its self-heating to increase, causing the battery cell temperature to rise.

[0003] To this end, we propose a secondary battery that improves the space utilization of the battery cell and reduces the internal resistance of the battery cell. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art. In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A secondary battery comprising:

[0006] A shell having an open end; a top cover having at least one inwardly recessed inner groove, the top cover being arranged on the open end of the shell, the shell and the top cover being enclosed to form a containing space, the containing space being used to accommodate bare cells; two poles, respectively installed in the inner groove positions on the surface of the top cover, the horizontal distance between the two poles being 0-600mm.

[0007] The pole (conductive terminal) is concave and close to the bare battery cell. On the one hand, it improves the space utilization and thus improves the battery life; on the other hand, it reduces the internal resistance of the battery cell to minimize its self-heating to reduce the rise in battery cell temperature.

[0008] Further preferably, the horizontal distance between the two poles is 0-300 mm.

[0009] Further preferably, when the opening ends are located at opposite sides of the shell, an inner groove recessed inwardly is provided on the top cover.

[0010] Further preferably, when the opening end is located at the upper end of the shell, two inwardly recessed inner grooves are provided on the top cover.

[0011] Further preferably, the two inner grooves are located on the same horizontal plane.

[0012] Further preferably, the poles are respectively a positive pole and a negative pole.

[0013] Further preferably, an explosion-proof valve and a liquid injection hole are provided on the surface of the top cover.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model improves the battery space utilization rate by concavely forming the battery conductive terminal and reduces the resistance by reducing the path through which the current passes, that is, reduces the internal resistance to reduce the battery self-heating and thus reduce the battery temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment;

[0017] Figure 2 It is a front view of the first embodiment;

[0018] Figure 3 It is a front view of the second embodiment;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the third embodiment;

[0020] Figure 5 This is the front view of the third embodiment.

[0021] In the figure: housing 1, top cover 2, inner groove 21, pole 3, injection hole 4, explosion-proof valve 5. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] A secondary battery comprising:

[0024] A shell 1 having an open end; a top cover 2, wherein the top cover 2 is provided with at least one inwardly recessed inner groove 21, and the top cover 2 is covered on the open end of the shell 1, and the shell 1 and the top cover 2 are combined to form a accommodating space, and the accommodating space is used to accommodate bare batteries; two poles 3 are respectively installed at the positions of the inner groove 21 on the surface of the top cover 2, and the horizontal distance between the two poles 3 is 0-600mm.

[0025] The horizontal distance between the two poles 3 is 0-300 mm.

[0026] When the opening ends are located at opposite sides of the housing 1 , the top cover 2 is provided with an inner groove 21 that is recessed inwards.

[0027] Example 1: Reference Figure 1-Figure 2 The two poles are respectively mounted on the inner groove 21 and are located on opposite sides of the housing 1 .

[0028] When the horizontal distance A between the two poles 3 is 600 mm, the internal resistance between the two poles 3 is 35-70 mΩ*Ah.

[0029] When the horizontal distance A between the two poles 3 is 300 mm, the internal resistance between the two poles 3 is 25-60 mΩ*Ah.

[0030] Example 2: Reference Figure 3 When the horizontal distance A between the two poles 3 is 0 mm, the internal resistance between the two poles 3 is 5-45 mΩ*Ah.

[0031] When the opening end is located at the upper end of the shell 1, two inner grooves 21 recessed inwardly are provided on the top cover 2; the two inner grooves 21 are located on the same horizontal plane.

[0032] Example 3: Reference Figure 4-Figure 5 The two poles are respectively mounted on the inner groove 21 and are located on one side of the housing 1 .

[0033] When the horizontal distance A between the two poles 3 is 600 mm, the internal resistance between the two poles 3 is 35-70 mΩ*Ah.

[0034] When the horizontal distance A between the two poles 3 is 300 mm, the internal resistance between the two poles 3 is 25-60 mΩ*Ah.

[0035] The poles 3 are respectively a positive pole and a negative pole; the poles 3 are located in the inner groove 21 and do not occupy space, so that the space utilization rate of the battery is improved and the overall energy density of the battery is improved.

[0036] The top cover 2 is provided with an explosion-proof valve 5 and a liquid injection hole 4, which respectively play the role of pressure relief and electrolyte injection.

[0037] After the battery is connected, the internal current is input and output from the two poles (conductive terminals). The concave conductive terminals of the battery reduce the path of the current, thereby reducing the resistance to the passage of current, that is, the internal resistance of the battery is reduced and the self-consumption energy is reduced. In addition, since the conductive terminals are concave inward, the concave distance can be controlled to reduce wasted space and improve space utilization.

[0038] The utility model improves the battery space utilization rate by concavely forming the battery conductive terminal and reduces the resistance by reducing the path through which the current passes, that is, reduces the internal resistance to reduce the battery self-heating and thus reduce the battery temperature rise.

Claims

1. A secondary battery, characterized in that: include: a housing having an open end; A top cover, wherein at least one inner groove is formed on the top cover, and the top cover is arranged on the opening end of the shell, and the shell and the top cover are enclosed to form an accommodating space, and the accommodating space is used to accommodate the bare battery cell; There are two poles, which are respectively installed in the groove positions in the surface of the top cover, and the horizontal distance between the two poles is 0-600mm.

2. A secondary battery according to claim 1, characterized in that: The horizontal distance between the two poles is 0-300 mm.

3. A secondary battery according to claim 1, characterized in that: When the opening ends are located at opposite sides of the shell, the top cover is provided with an inner groove which is recessed inwards.

4. A secondary battery according to claim 1, characterized in that: When the opening end is located at the upper end of the shell, two inwardly recessed inner grooves are arranged on the top cover.

5. A secondary battery according to claim 4, characterized in that: The two inner grooves are located on the same horizontal plane.

6. A secondary battery according to claim 1, characterized in that: The poles are respectively a positive pole and a negative pole.

7. A secondary battery according to claim 1, characterized in that: An explosion-proof valve and a liquid injection hole are provided on the surface of the top cover.

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