Pole adapter, single battery and high-capacity battery

Abstract

The utility model discloses a pole adapter, a single battery and a high-capacity battery. The pole adapter comprises a conductive main body, the bottom of the conductive main body is provided with a connecting plate connected with a single battery pole; the conductive main body is provided with a heat exchange hole penetrating through the conductive main body. According to the utility model, the pole adapters with the heat exchange holes are arranged on the pole of the single battery, after the single battery with the pole adapters is utilized to construct the high-capacity battery, the heat exchange holes on the pole adapters are communicated to form the heat exchange channel of the high-capacity battery, and the heat exchange medium is injected into the heat exchange channel, so that the high-capacity battery is formed. Each pole adapter is in direct contact with the heat exchange medium, so that the utilization efficiency of the heat exchange medium can be improved, and the heat exchange effect of the high-capacity battery is further improved; besides, due to the adoption of a direct heat exchange mode, a better heat exchange effect is achieved, so that the sectional area of the heat exchange hole does not need to be too large, and the conductivity of the pole adapter can be further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery field, concretely is a kind of pole adapter, monomer battery and large capacity battery. BACKGROUND

[0002] At present, common large capacity battery (also can be called battery pack or battery module) is connected together by the way of parallel, series or series-parallel combination of multiple monomer batteries using electrical connector.

[0003] Temperature control of large capacity battery has been the hotspot of the field, when current is too large, it will cause electrical connector to overheat, affect the normal operation of large capacity battery;In addition, since the pole of monomer battery in large capacity battery is the most concentrated part of heat, when local heat of pole is too high, it will also cause the temperature of electrical connector connected therewith to soar, affect the normal operation of large capacity battery. INVENTION CONTENTS

[0004] The first aspect of the utility model provides a kind of pole adapter, pole adapter is fixed on the pole of monomer battery, the problem of excessive local temperature of pole in monomer battery is solved by the heat exchange hole provided on pole adapter.

[0005] The pole adapter, including electrically conductive main body;Electrically conductive main body bottom is provided with the connecting plate for being connected with the pole of monomer battery;Electrically conductive main body is provided with heat exchange hole passing through electrically conductive main body.

[0006] The pole adapter of the utility model is provided with heat exchange hole on the pole of monomer battery, after using monomer battery with pole adapter to build large capacity battery, the heat exchange hole on each pole adapter is communicated, to form the heat exchange passage of large capacity battery, heat exchange medium is injected into heat exchange passage, the heat exchange of the pole of monomer battery can be realized, avoid the problem that pole temperature is too high possibly brings, while each pole adapter is directly contacted with heat exchange medium, the utilization efficiency of heat exchange medium can be improved, to further improve the heat exchange effect of this kind of large capacity battery;In addition, since direct heat exchange mode is used, it has good heat exchange effect, therefore, the cross-sectional area of heat exchange hole does not need to be too large, to further improve the electric conductivity of pole adapter.

[0007] Further, since connecting plate is fixed on pole by the way of welding, there can be gap between the bottom surface of electrically conductive main body and the top surface of pole, to ensure the electric conductivity and thermal conductivity between pole adapter and pole, the above-mentioned bottom surface of electrically conductive main body is provided with concave-convex structure for increasing the contact area with the pole of monomer battery.

[0008] Further, since the connecting plate fixes the pole post adapter to the pole post by welding, there may be a gap between the bottom surface of the conductive body and the top surface of the pole post, in order to ensure the conductivity and heat conduction between the pole post adapter and the pole post, the bottom surface of the conductive body is provided with a groove.

[0009] Further, a plurality of heat conduction ribs are arranged on the wall of the heat exchange hole for increasing the heat exchange area, each heat conduction rib extends along the x direction, and the plurality of heat conduction ribs are uniformly distributed along the circumference of the through hole. Since the inner wall of the heat exchange hole is provided with heat conduction ribs for increasing the heat exchange area, the contact area between the heat exchange medium and the pole post adapter can be increased through the heat conduction ribs, thereby increasing the heat exchange area and further improving the heat exchange effect. Moreover, since the plurality of heat conduction ribs are uniformly distributed along the circumference of the channel, the temperature uniformity of each part of the pole post adapter is good, and each heat conduction rib extends along the axial direction of the heat exchange hole without affecting the flowability of the heat exchange medium in the heat exchange hole.

[0010] Further, in order to facilitate installation and ensure good sealing when the heat exchange holes of two adjacent single battery pole post adapters are connected by the insulating heat exchange pipe, the two end ports of the heat exchange hole are provided with mounting interfaces for connecting the insulating heat exchange pipe.

[0011] The second aspect of the utility model provides a single battery, including shell and electrode assembly and electrolyte in shell; shell is enclosed by upper cover assembly, barrel and lower cover assembly; upper cover assembly includes cover plate and positive pole and negative pole fixedly arranged on cover plate; positive pole and negative pole are fixedly installed with pole post adapter of above-mentioned first aspect.

[0012] The third aspect of the utility model provides a large-capacity battery, characterized by comprising N single batteries and 2N pole post adapters of the first aspect, N≥2;The positive and negative poles of each single battery are fixed with a pole post adapter;The heat exchange holes on the pole post adapters of the same side of adjacent single batteries are connected by insulating heat exchange pipes.

[0013] Further, the large-capacity battery further comprises a hollow pipe; the hollow pipe covers the explosion vent of each single battery, and when thermal runaway occurs in any single battery, the thermal runaway flue gas is discharged through the hollow pipe. The discharged thermal runaway flue gas can be treated by direct discharge, ignition combustion or adsorption. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of the three-dimensional structure of the pole post adapter in embodiment 1;

[0015] Figure 2 It is a sectional view of the pole post adapter provided with an annular protrusion in embodiment 1;

[0016] Figure 3 A sectional view of the pole adapter provided with an annular groove in Example 1;

[0017] Figure 4 A structural schematic view of the single battery in Example 2;

[0018] Figure 5 A structural schematic view of the large capacity battery in Example 3.

[0019] In the drawings:

[0020] 1-pole adapter, 11-conductive body, 12-connection plate, 13-heat exchange hole, 14-heat conduction rib plate, 15-mounting interface, 151-annular protrusion, 152-annular groove, 2-single battery, 21-outer shell, 22-upper cover assembly, 23-cylinder body, 24-lower cover assembly, 3-insulating connecting pipe, 4-electric connector, 5-hollow pipe. DETAILED DESCRIPTION

[0021] In order to make the above objectives, characteristics and advantages of the present application more apparent, specific embodiments of the present application will be described in detail in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0023] In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "top, bottom, etc." is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first, second, third, fourth, etc." are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] The design idea of the present application is:

[0025] High-capacity batteries use terminal adapters fixedly mounted on the individual cell terminals. These adapters have heat exchange holes penetrating the conductive body. The interconnected heat exchange holes of all the adapters form a heat exchange channel for the high-capacity battery. By directly introducing a heat exchange medium into this channel, heat exchange is achieved on the individual cell terminals, avoiding potential problems caused by excessively high terminal temperatures and ensuring the safety of the battery pack. Simultaneously, the direct contact between the adapters and the heat exchange medium improves the utilization efficiency of the medium, thus enhancing the heat exchange effect of this type of high-capacity battery. Furthermore, due to the direct heat exchange method, which offers good heat exchange performance, the cross-sectional area of ​​the heat exchange holes does not need to be large, thereby improving the conductivity of the adapters.

[0026] Example 1

[0027] like Figures 1 to 3 As shown, in this embodiment, the electrode adapter 1 is made of aluminum material and includes a conductive body 11; the bottom of the conductive body 11 is provided with a connecting plate 12 for connecting with the electrode of a single battery cell; a heat exchange hole 13 is provided on the conductive body 11 through the conductive body.

[0028] The combined dimensions of the bottom surface of the connecting plate 12 and the bottom surface of the conductive body 11 need to cover the top surface of the individual battery terminal. In this embodiment, the connecting plate 12 fixes the conductive body 11 to the individual battery terminal by welding. In some other embodiments, it can also be connected to the individual battery terminal by screws. However, screw connections are more difficult to ensure the tightness of the connection between the terminal adapter and the individual battery terminal compared to welding. The horizontal cross-sectional shape of the terminal adapter depends on the horizontal cross-sectional shape of the individual battery terminal.

[0029] In this embodiment, the conductive body 11 and the connecting plate 12 are fixed by integral molding. In other embodiments, the conductive body 11 and the connecting plate 12 are separate parts that can be welded to form an electrode adapter.

[0030] In this embodiment, although the conductive body 11 is welded and fixed to the single-cell battery terminal by a connecting plate, a gap still exists between the bottom surface of the conductive body 11 and the top surface of the terminal. This gap directly affects the electrical and thermal conductivity between the terminal adapter and the terminal. To solve this problem, the following two methods can be used:

[0031] The first method: The bottom surface of the conductive body 11 is provided with a concave-convex structure. The concave-convex structure can be a discrete dot-shaped protrusion on the bottom surface of the conductive body, or it can be a knurled structure on the bottom surface of the conductive body.

[0032] The second method: The bottom surface of the conductive body 11 is provided with a groove, which is filled with a medium that is both thermally and electrically conductive, so as to ensure that the preferred material is tin or silver.

[0033] In the embodiment, in order to improve the heat exchange effect, a plurality of heat-conducting ribs 14 for increasing the heat exchange area are arranged on the wall of the heat exchange hole of the pole adapter 1, each heat-conducting rib 14 extends along the x direction, and the plurality of heat-conducting ribs 14 are uniformly distributed along the circumference of the through hole. Through the heat-conducting ribs 14, the contact area of the heat exchange medium with the pole adapter 1 can be increased, and thus the heat exchange area is increased, and the heat exchange effect is further improved. Since the plurality of heat-conducting ribs 14 are uniformly distributed along the circumference of the through hole, the temperature uniformity of each part of the pole adapter is good. Each heat-conducting rib 14 extends along the axis of the heat exchange hole, and does not affect the flowability of the heat exchange medium in the heat exchange hole.

[0034] In the embodiment, in order to facilitate installation and ensure good sealing when the heat exchange holes 13 of two adjacent single battery pole adapters are connected through the insulating heat exchange pipe, the two end ports of the heat exchange hole are provided with a mounting interface 15 for connecting the insulating heat exchange pipe.

[0035] The mounting interface can have the following structure:

[0036] First, as shown in Figure 2 , the mounting interface 15 is an annular boss 151 integrally formed on the side wall of the conductive main body and protruding from the side wall of the conductive main body;

[0037] The outer wall circumferential dimension of the annular boss 151 is matched with the inner wall circumferential dimension of the insulating connecting pipe, that is, the outer wall circumferential dimension of the annular boss 151 is consistent with or slightly smaller than the inner wall circumferential dimension of the insulating connecting pipe;

[0038] When connected, the insulating connecting pipe is sleeved on the outer wall of the annular boss 151 to realize the connection of the heat exchange holes 13 between the single battery 2 pole adapters. The mounting interface 15 of this structure can increase the heat exchange area through which the heat exchange medium passes, and also facilitates quick and reliable connection with the insulating connecting pipe.

[0039] Alternatively, the inner wall circumferential dimension of the annular boss 151 is matched with the outer wall circumferential dimension of the insulating connecting pipe, that is, the inner wall circumferential dimension of the annular boss 151 is consistent with or slightly smaller than the outer wall circumferential dimension of the insulating connecting pipe;

[0040] When connected, the insulating connecting pipe is embedded into the inner wall of the annular boss 151 to realize the connection of the heat exchange holes 13 between the single batteries. Specifically, the insulating connecting pipe can be inserted into the annular boss 151 through interference fit;

[0041] Second, as shown in Figure 3 , the mounting interface 15 is an annular groove 152 arranged on the side wall of the conductive column;

[0042] When connected, the end of the insulating connecting pipe is inlaid in the annular groove 152. With respect to the structure of the annular boss 151, the annular groove 152 can be machined on the existing pole adapter 1, thereby reducing the manufacturing cost of the pole adapter 1.

[0043] Embodiment 2

[0044] As shown in Figure 4 , the embodiment provides a single battery 2, which comprises a shell 21 and an electrode assembly and an electrolyte in the shell 21; the shell 21 is enclosed by an upper cover assembly 22, a barrel 23 and a lower cover assembly 24; the upper cover assembly 24 comprises a cover plate and a positive pole and a negative pole fixedly arranged on the cover plate; the positive pole and the negative pole are both fixedly installed with the pole adapter 1 described in Embodiment 1.

[0045] Embodiment 3

[0046] As shown in Figure 5 , the embodiment provides a large-capacity battery, which comprises N single batteries 2 and 2N pole adapters 1 described in Embodiment 1, N≥2; the positive pole and the negative pole of each single battery 2 are both fixed with the pole adapter 1; the heat exchange holes 13 on the pole adapters 1 on the same side of adjacent single batteries are communicated through the insulating heat exchange pipes 3.

[0047] In the large-capacity battery, N-1 electric connectors 4 can be used to realize the series connection between the single batteries, and for the adjacent two single batteries 2, one end of the electric connector 4 is connected to the top surface of the positive pole adapter of one single battery, and the other end of the electric connector 4 is connected to the top surface of the negative pole adapter of the other single battery.

[0048] Alternatively, two electric connectors can be used to realize the parallel connection between the single batteries, one electric connector is connected to the top surface of the positive pole adapter of all single batteries, and the other electric connector is connected to the top surface of the negative pole adapter of all single batteries.

[0049] Embodiment 4

[0050] The embodiment is an improvement based on Embodiment 3, and further comprises a hollow pipe 5; the hollow pipe 5 covers the explosion vent of each single battery 2, and when thermal runaway occurs in any single battery, the thermal runaway flue gas is discharged through the hollow pipe 5.

Claims

1. A pole adapter, characterized by: The conductive main body comprises a conductive main body; The conductive main body is provided with a connecting plate at the bottom for connecting with the pole of the single battery; and a heat exchange hole is formed in the conductive main body.

2. The pole lug adapter of claim 1, wherein: The bottom surface of the conductive main body is provided with a concave-convex structure for increasing the contact area with the pole of the single battery.

3. The pole lug adapter of claim 1, wherein: The bottom surface of the conductive main body is provided with a groove.

4. The pole lug adapter of any one of claims 1 to 3, wherein, A plurality of heat-conducting rib plates are arranged on the wall of the heat exchange hole for increasing the heat exchange area, each heat-conducting rib plate extends along the x direction, and the plurality of heat-conducting rib plates are uniformly distributed along the circumference of the through hole.

5. The pole lug adapter of claim 4, wherein, The two ends of the heat exchange hole are provided with mounting interfaces for connecting with the insulating heat exchange pipe.

6. A single cell characterized by The electrode assembly and the electrolyte are arranged in the shell; the shell is enclosed by the upper cover assembly, the cylinder and the lower cover assembly; the upper cover assembly comprises a cover plate, a positive pole and a negative pole fixedly arranged on the cover plate; the positive pole and the negative pole are both fixedly provided with the pole adapter of claim 1.

7. A high capacity battery characterized by The electrode assembly and the electrolyte are arranged in the shell; the shell is enclosed by the upper cover assembly, the cylinder and the lower cover assembly; the upper cover assembly comprises a cover plate, a positive pole and a negative pole fixedly arranged on the cover plate; the positive pole and the negative pole are both fixedly provided with the pole adapter of claim 1.

8. A high capacity battery as claimed in claim 7, wherein, The electrode assembly and the electrolyte are arranged in the shell; the shell is enclosed by the upper cover assembly, the cylinder and the lower cover assembly; the upper cover assembly comprises a cover plate, a positive pole and a negative pole fixedly arranged on the cover plate; the positive pole and the negative pole are both fixedly provided with the pole adapter of claim 1. The hollow pipe is arranged on the explosion vent of each single battery, and the hot runaway smoke is discharged through the hollow pipe when the hot runaway occurs in any single battery.

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