Detection device for battery and battery assembly

Abstract

The utility model discloses a detection device for a battery. The detection device comprises a battery and a heating device, the battery is cylindrical, and a to-be-heated area is formed on the peripheral surface of the battery; the heating device is arranged on the periphery of the battery, an arc-shaped heating surface is formed on the heating device, and the arc-shaped heating surface covers the to-be-heated area and is in surface-to-surface fit with the to-be-heated area so as to uniformly heat the to-be-heated area. According to the detection device provided by the utility model, the to-be-heated area is defined on the battery, and the to-be-heated area is heated through the arc-shaped heating surface on the heating device in a surface-to-surface fitting manner, so that external heat can be concentrated on the to-be-heated area on the battery, the heating area is reduced, and the heating uniformity is improved; and the triggering experiment of the battery thermal runaway can be more stable.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a detection device for batteries and a battery assembly. Background Art

[0002] Compared with square-shell batteries with larger volume and capacity, cylindrical cells with smaller volume and capacity have better thermal safety performance. When manufacturing cylindrical cells, it is usually necessary to conduct thermal runaway trigger tests on the cells in order to detect whether their safety can meet the use requirements. In the prior art, thermal runaway trigger tests for cylindrical cells usually use a heating wire or heating rod to heat the cells. This type of method may cause the outer shell of the cylindrical cell to explode due to uneven heating. At the same time, the introduction of too much energy may cause the battery thermal runaway to be more severe than normal triggering, posing a major safety hazard. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a detection device for a battery. According to the detection device of the utility model, a heating area is defined on the battery, and the heating area is heated by the arc-shaped heating surface on the heating device in a surface-to-surface manner, which can concentrate the external heat on the heating area on the battery, reduce the heating area, and improve the uniformity of heating, so that the triggering experiment of battery thermal runaway can be more stable.

[0004] The utility model also provides a battery assembly comprising the above detection device.

[0005] According to the utility model, the detection device includes a heating device, and a heating zone is formed on the outer peripheral surface of the battery; the heating device is arranged on the outer periphery of the battery, and an arc-shaped heating surface is formed on the heating device, and the arc-shaped heating surface covers the heating zone and fits the heating zone surface to uniformly heat the heating zone.

[0006] According to the detection device of the utility model, an arc-shaped heating surface is provided on the heating device, and at the same time, a heating area is formed on the outer peripheral surface of the battery. When assembled, the arc-shaped heating surface can cover the heating area and cooperate with the outer peripheral surface of the battery to achieve surface-to-surface contact between the arc-shaped heating surface and the heating area. When the heating device is working, the arc-shaped heating surface can transfer the heat generated by the heating device to the battery to heat the battery and cause the battery to thermally run away, which is convenient for the subsequent detection and analysis of the battery thermal runaway triggering test results. Compared with the heating wire winding heating method in the prior art, the utility model can concentrate the external heat on the heating area on the outer surface of the battery by heating the heating device to trigger the thermal runaway of the battery, reduce the heating area, reduce the influence of high temperature on the battery cell shell, and reduce the risk of the battery cell shell body bursting. At the same time, the arc-shaped heating surface is in surface contact with the heating area, and the heating area can be evenly heated, so that the thermal runaway triggering experiment of the battery is more stable, and the safety of the detection device for the thermal runaway triggering experiment of the cylindrical battery cell is improved.

[0007] According to one embodiment of the utility model, the heating device includes: a heating plate, which is constructed in an arc shape that matches at least a portion of the outer circumference of the battery, and the heating plate can be selectively connected to an external power source and generate heat to heat the battery.

[0008] According to an embodiment of the present invention, the distance between the heating plate and the negative electrode of the battery is d1, and satisfies: "5mm≤d1≤10mm".

[0009] According to an embodiment of the utility model, the heating device further comprises: a heat-conducting layer, the heat-conducting layer is arranged on a side of the heating plate facing the battery, and the heat-conducting layer connects the heating plate to the battery.

[0010] According to an embodiment of the present invention, the thickness of the heat-conducting layer is d2, and satisfies: "0.1 mm<d2<0.3 mm".

[0011] According to an embodiment of the utility model, the heating device further comprises: a heat insulating layer, wherein the heat insulating layer is arranged on a side of the heating plate away from the battery.

[0012] The battery assembly according to the utility model is briefly described below.

[0013] According to the utility model, the battery assembly includes a first battery and a second battery. The outer peripheral surface of the first battery is provided with a heating area, and the first battery is suitable for thermal runaway. The second battery is constructed in multiple pieces and is arranged around the outer periphery of the first battery. Among them, a detection device is provided on the outer periphery of the first battery, and the detection device can cause the first battery to have thermal runaway; a detection member is provided on the outer periphery of the second battery, and the detection member can detect the state of the second battery. When the first battery is in a thermal runaway state, the detection member can monitor the state of each second battery around the first battery in real time and make a record, so as to judge whether the thermal runaway of the first battery will cause safety hazards to the surrounding second batteries, thereby improving the accuracy of the thermal runaway triggering experiment of the first battery.

[0014] According to an embodiment of the present invention, a plurality of the second batteries are arranged in a regular hexagonal shape around the outer periphery of the first battery.

[0015] According to one embodiment of the utility model, the centers of two adjacent second batteries relative to the center of the first battery form a first fan-shaped area, and the two ends of the heating device in the circumferential direction respectively form a second fan-shaped area with the center of the first battery; wherein at least a portion of the projection of the second fan-shaped area in the radial direction of the first battery is located within the first fan-shaped area.

[0016] According to an embodiment of the present invention, the heating device is configured as a plurality of heating devices spaced apart from each other in the circumferential direction, and each heating device is disposed corresponding to a gap between any two adjacent second batteries.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is an assembly diagram of a heating device and a battery according to an embodiment of the utility model;

[0020] Figure 2 is a top view of a heating device and a battery assembled according to an embodiment of the utility model;

[0021] Figure 3 It is a top view of a detection device according to an embodiment of the utility model.

[0022] Reference numerals:

[0023] Battery 11;

[0024] Heating device 12, heating plate 121, heat conducting layer 122, heat insulating layer 123;

[0025] A first battery 131, a second battery 132;

[0026] A first sector-shaped area 101 , a second sector-shaped area 102 , and a battery assembly 10 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Compared with square-shell batteries with larger volume and capacity, cylindrical cells with smaller volume and capacity have better thermal safety performance. When manufacturing cylindrical cells, it is usually necessary to conduct thermal runaway trigger tests on the cells in order to detect whether their safety can meet the use requirements. In the prior art, thermal runaway trigger tests for cylindrical cells usually use a heating wire or heating rod to heat the cells. This type of method may cause the outer shell of the cylindrical cell to explode due to uneven heating. At the same time, the introduction of too much energy may cause the battery thermal runaway to be more severe than normal triggering, posing a major safety hazard.

[0029] Reference below Figure 1-Figure 3 A detection device for a battery according to an embodiment of the utility model is described.

[0030] The detection device according to the utility model includes a heating device, and a heating area is formed on the outer peripheral surface of the battery 11; the heating device 12 is arranged on the outer periphery of the battery 11, and an arc-shaped heating surface is formed on the heating device 12, which covers the heating area and fits the heating area surface to uniformly heat the heating area.

[0031] According to the detection device of the utility model, an arc-shaped heating surface is provided on the heating device 12, and at the same time, a heating area is formed on the outer peripheral surface of the battery 11. When assembled, the arc-shaped heating surface can cover the heating area and cooperate with the outer peripheral surface of the battery 11 to achieve the surface-to-surface contact between the arc-shaped heating surface and the heating area. When the heating device 12 is working, the arc-shaped heating surface can transfer the heat generated by the heating device 12 to the battery 11 to heat the battery 11 and cause the battery 11 to have thermal runaway, which is convenient for the subsequent detection and analysis of the results of the thermal runaway triggering experiment of the battery 11. Compared with the heating wire winding heating method in the prior art, the utility model can concentrate the external heat on the heating area on the outer surface of the battery 11 by heating the heating device 12 to trigger the thermal runaway of the battery 11, reduce the heating area, reduce the influence of high temperature on the battery shell, and reduce the risk of the battery shell body bursting. At the same time, the arc-shaped heating surface is in surface contact with the heating area, and the heating area can be evenly heated, so that the thermal runaway triggering experiment of the battery 11 is more stable, and the safety of the detection device for the thermal runaway triggering experiment of the cylindrical battery is improved.

[0032] According to one embodiment of the utility model, the heating device 12 includes a heating plate 121, which is constructed to be an arc that matches at least a portion of the outer circumference of the battery 11. The heating plate 121 can be selectively connected to an external power source and generate heat to heat the battery 11. Specifically, the heating device 12 is provided with a heating plate 121, and the heating plate 121 can be electrically connected to an external power supply. When thermal runaway triggering is required, the heating plate 121 is connected to the external power supply and works to generate heat. The generated heat can be transferred to the battery 11 to thereby increase the temperature of the battery 11 to trigger thermal runaway of the battery 11. During the triggering process, the heating plate 121 can adjust the power of the external power supply to adjust the generated heat and thereby control the rate of change of the temperature of the battery 11, so that the thermal runaway triggering experiment of the battery 11 can have more data results, thereby improving the accuracy of the thermal runaway triggering experiment of the battery 11. At the same time, during the heat transfer process, the main body of the heating plate 121 is constructed as an arc that matches at least part of the outer circumference of the battery 11, and can continuously and evenly transfer heat to the battery 11, thereby ensuring the stability of the thermal runaway triggering experiment of the battery 11.

[0033] According to one embodiment of the utility model, the distance between the heating plate 121 and the negative pole of the battery 11 is d1, and satisfies: "5mm≤d1≤10mm". During assembly, the distance between the position of the heating plate 121 and the negative pole of the battery 11 is d1, and 5mm≤d1≤10mm, that is, the distance from the end face of the heating plate 121 to the negative pole of the battery 11 is within the range of 5mm-10mm. The setting position of the heating plate 121 can avoid the heat directly acting on the negative pole or positive pole of the battery 11 during heating and causing safety hazards. At the same time, it can also reserve enough space between the heating plate 121 and the other end of the battery 11 to facilitate the assembly of multiple batteries 11 with other batteries. It is worth noting that in the cylindrical battery of the present application, such as Figure 1 As shown, the negative electrode and the positive electrode of the battery 11 are at the same end. The distance here refers to the axial distance on the outer circumference of the battery 11. In other types of cylindrical batteries, d1 can be set according to actual conditions.

[0034] According to an embodiment of the utility model, the heating device 12 further includes a heat-conducting layer 122, which is disposed on the side of the heating plate 121 facing the battery 11, and the heat-conducting layer 122 connects the heating plate 121 to the battery 11. When the heating plate 121 is assembled, the heating device 12 further provides a heat-conducting layer 122 between the heating plate 121 and the battery 11, and the provision of the heat-conducting layer 122 can prevent the heating plate 121 from directly contacting the battery 11, and prevent the heating plate 121 from damaging the battery 11 housing under high temperature conditions.

[0035] In some embodiments, the heat-conducting layer 122 may be made of a heat-conducting adhesive having heat-conducting properties. The heat-conducting adhesive can improve the stability of the assembly of the heating plate 121 while transferring heat.

[0036] According to an embodiment of the present invention, the thickness of the heat-conducting layer 122 is d2, and satisfies "0.1mm<d2<0.3mm". When the heat-conducting layer 122 is set, the thickness of the heat-conducting layer 122 can be maintained in the range of 0.1mm-0.3mm, while avoiding direct contact between the heating plate 121 and the battery 11, it can also avoid that the heat-conducting layer 122 is too thick and affects the heat transfer of the heating plate 121. In this application, d2 is usually 0.2mm. In actual assembly, d2 can also be set according to the power of the heating plate 121.

[0037] According to an embodiment of the present invention, the heating device 12 further includes a heat insulating layer 123, which is disposed on the side of the heating plate 121 away from the battery 11. During assembly, the heating device 12 may further include a heat insulating layer 123 on the side of the heating plate 121 away from the battery 11, and the heat insulating layer 123 may reduce the impact of the heating plate 121 on other surrounding batteries, thereby improving the safety of other batteries.

[0038] In some embodiments, the heat insulation layer 123 may be made of mica tape, which can further improve the stability of the assembly of the heating plate 121 while providing heat insulation.

[0039] The battery assembly 10 according to the present invention is briefly described below.

[0040] According to the utility model, the battery assembly 10 includes a first battery 131 and a second battery 132. The outer peripheral surface of the first battery 131 is provided with a heating area, and the first battery 131 is suitable for thermal runaway; the second battery 132 is constructed into a plurality of batteries and is arranged around the outer periphery of the first battery 131. Among them, a detection device is arranged on the outer periphery of the first battery 131, and the detection device can cause the first battery 131 to have thermal runaway; a detection member is arranged on the outer periphery of the second battery 132, and the detection member can detect the state of the second battery 132. When the first battery 131 is in a thermal runaway state, the detection member can monitor the state of each second battery 132 around the first battery 131 in real time and make a record, so as to judge whether the thermal runaway of the first battery 131 will cause safety hazards to the surrounding second batteries 132, thereby improving the accuracy of the thermal runaway triggering experiment of the first battery 131.

[0041] According to an embodiment of the utility model, a plurality of second batteries 132 are arranged in a regular hexagonal shape around the outer periphery of the first battery 131. During assembly, six second batteries 132 can be arranged around the first battery 131, and the six second batteries 132 are arranged in a regular hexagonal shape around the first battery 131. The arrangement of the second batteries 132 can improve the efficiency of cylindrical battery grouping and improve space utilization.

[0042] According to one embodiment of the utility model, the centers of two adjacent second batteries 132 relative to the center of the first battery 131 form a first fan-shaped area 101, and the two ends of the heating device 12 in the circumferential direction respectively form a second fan-shaped area 102 between the center of the first battery 131; wherein, at least part of the projection of the second fan-shaped area 102 in the radial direction of the first battery 131 is located within the first fan-shaped area 101.

[0043] During assembly, the lines connecting the centers of two adjacent second batteries 132 and the center of the first battery 131 form a first sector-shaped area 101. Similarly, the lines connecting the two ends of the heating device 12 in the circumferential direction and the centers of the first battery 131 form a second sector-shaped area 102. When the heating device 12 is assembled, at least part of the projection of the second sector-shaped area 102 in the radial direction of the first battery 131 falls into the first sector-shaped area 101.

[0044] Preferably, the heating device 12 is arranged as a whole in the first sector area 101, and the center of the heating device 12 in the circumferential direction is located on the angular bisector of the first sector area 101, so that the distance from the heating device 12 to two adjacent second batteries 132 is the same, so that the two adjacent second batteries 132 can absorb the excess heat generated by the heating plate 121 relatively evenly, avoiding one of the second batteries 132 absorbing too much heat and affecting the subsequent heat diffusion results.

[0045] According to an embodiment of the utility model, the heating device 12 is constructed as a plurality of heating devices 12 spaced apart from each other in the circumferential direction, and each heating device 12 is arranged corresponding to the gap between any two adjacent second batteries 132. When the heating device 12 is assembled, a plurality of heating devices 12 can be arranged on a first battery 131, and the plurality of heating devices 12 are arranged spaced apart in the circumferential direction of the first battery 131. It should be noted that each heating device 12 is arranged corresponding to the gap between two adjacent second batteries 132, and the two second batteries 132 corresponding to one heating device 12 and the two second batteries 132 corresponding to another heating device 12 are different second batteries 132.

[0046] Preferably, there may be two heating devices 12. When one of the heating devices 12 fails, the other heating device 12 can continue to trigger the thermal runaway of the first battery 131, thus ensuring the normal conduct of the entire experiment. However, when there are too many heating devices 12, the assembly of the battery assembly 10 will be affected.

[0047] In some embodiments, the arc-shaped heating surface can be understood as a side surface of the heating plate 121 facing the battery 11, and can also be understood as a side surface of the heat-conducting layer 122 in contact with the area to be heated.

[0048] exist Figure 1 In FIG. 1 , “+” refers to the positive electrode of the battery 11 , and “−” refers to the negative electrode of the battery 11 .

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0051] In the description of the present invention, "plurality" means two or more.

[0052] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0053] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A detection device for a battery, wherein a heating zone is formed on the outer peripheral surface of the battery, characterized in that: include: A heating device is arranged at the periphery of the battery, and an arc-shaped heating surface is formed on the heating device. The arc-shaped heating surface covers the area to be heated and is in contact with the area to be heated surface to uniformly heat the area to be heated.

2. The battery detection device according to claim 1, characterized in that: The heating device comprises a heating plate, which is constructed in an arc shape matching at least a portion of the outer circumference of the battery. The heating plate can be selectively connected to an external power source and generate heat to heat the battery.

3. The battery detection device according to claim 2, characterized in that: The distance between the heating plate and the negative electrode of the battery is d1, and satisfies: "5mm≤d1≤10mm".

4. The battery detection device according to claim 2, characterized in that: The heating device further comprises: a heat-conducting layer, which is arranged on a side of the heating plate facing the battery, and the heat-conducting layer connects the heating plate to the battery.

5. The battery detection device according to claim 4, characterized in that: The thickness of the heat-conducting layer is d2, and satisfies: "0.1 mm<d2<0.3 mm".

6. The battery detection device according to claim 2, characterized in that: The heating device further comprises: a heat insulating layer, wherein the heat insulating layer is arranged on a side of the heating plate away from the battery.

7. A battery assembly, characterized in that: include: a first battery, wherein the area to be heated is disposed on an outer peripheral surface of the first battery, and the first battery is suitable for thermal runaway; A second battery, wherein the second battery is structured in a plurality and is disposed around the periphery of the first battery; A detection device, the detection device is arranged at the periphery of the first battery and is constructed as the detection device according to any one of claims 1 to 6; A detection member is arranged on the second battery, and is suitable for detecting a state of the second battery.

8. The battery assembly according to claim 7, characterized in that: The plurality of second batteries are arranged in a regular hexagonal pattern around the outer periphery of the first battery.

9. The battery assembly according to claim 8, characterized in that: The centers of two adjacent second batteries relative to the center of the first battery form a first sector area, and the two ends of the heating device in the circumferential direction respectively form a second sector area with the center of the first battery; wherein At least a portion of a projection of the second sector-shaped area in the radial direction of the first battery is located within the first sector-shaped area.

10. The battery assembly according to claim 9, characterized in that: The heating devices are configured to be a plurality of devices spaced apart from each other in a circumferential direction, and each of the heating devices is disposed corresponding to a gap between any two adjacent second batteries.

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