Batteries and batteries

Abstract

The present invention relates to the technical field of new energy batteries, and discloses a battery and a battery pack. The battery has good heat dissipation, can reduce heat accumulation, and improve thermal runaway caused by poor heat dissipation of the battery. In the battery of the present invention, the battery cell includes a first pole ear and a second pole ear with opposite polarities, and the first pole ear and the second pole ear are arranged on the same side of the battery cell; the current collecting assembly includes a first current collecting member, a second current collecting member and at least one first through hole, the first through hole is arranged in the first current collecting member, the first current collecting member has a first pole ear connection area and a first pole column connection area, the first pole ear connection area at least partially surrounds the first pole column connection area, the first through hole is arranged in the first pole ear connection area, the distance from the first through hole closest to the first pole column connection area in the radial direction of the first current collecting member to the center of the first pole column connection area is L1, the distance from the radial outer edge of the first current collecting member to the center of the first pole column connection area is L2, and the ratio range of the distance L1 to the distance L2 is 0.15-0.95.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery and a battery pack. Background Art

[0002] With the continuous development of new energy technology, new energy batteries, as an environmentally friendly energy storage and release device, have been widely used in energy storage power systems such as hydropower, thermal, wind and solar power stations, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and many other technical fields.

[0003] Cylindrical batteries are widely used as they have high capacity, long cycle life, and a wide range of ambient temperatures. The positive and negative tabs of cylindrical batteries are led out on the same side, and a large amount of heat is generated at the connection between the current collector and the tabs and the poles. In addition, since the cylindrical battery cells are tightly wound and difficult to dissipate heat, a large amount of heat will accumulate at the top of the battery, and the battery is prone to thermal runaway due to poor heat dissipation, which in turn affects battery performance. Summary of the invention

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that the current collecting part area of ​​the existing battery has poor heat dissipation and affects the battery performance.

[0005] In a first aspect, the present invention provides a battery, the battery comprising a battery cell, a pole and a current collecting assembly, the battery cell comprising a first pole ear and a second pole ear with opposite polarities, the first pole ear and the second pole ear being arranged on the same side of the battery cell; the current collecting assembly being electrically connected to the pole, the first pole ear and the second pole ear, the current collecting assembly comprising:

[0006] a first current collecting member, electrically connected to the first electrode tab;

[0007] a second current collecting member, electrically connected to the second electrode tab;

[0008] At least one first through hole is arranged on the first current collector, the first current collector has a first pole lug connection area and a first pole column connection area, the first pole lug connection area is at least partially arranged around the first pole column connection area, the first through hole is arranged in the first pole lug connection area, along the radial direction of the first current collector, the distance from the first through hole closest to the first pole column connection area to the center of the first pole column connection area is L1, the distance from the radial outer edge of the first current collector to the center of the first pole column connection area is L2, and the ratio range of distance L1 to distance L2 is 0.15-0.95.

[0009] Beneficial effect: The current collecting assembly of the battery of the present invention includes at least one first through hole, and the first through hole is arranged on the first current collecting member. The air around the current collecting assembly can dissipate heat to the current collecting assembly through the first through hole. Without increasing the overall size of the current collecting assembly, the first through hole can increase the heat dissipation area of ​​the current collecting assembly and enhance the heat dissipation effect of the current collecting assembly, reduce the heat accumulation on the top of the battery, and significantly improve the thermal runaway problem caused by poor heat dissipation, thereby ensuring the battery performance. In addition, since the closer the current collecting assembly is to the center of the first pole connection area, the greater the heat generation, the first through hole should be as close as possible to the center of the first pole connection area. However, if the distance from the first through hole to the center of the first pole connection area is too close, the flow area of ​​the first pole connection area will be reduced, affecting the flow of the pole. If the distance from the first through hole to the center of the first pole connection area is too far, it is not conducive to the effective heat dissipation of the current collecting assembly. In the present invention, along the radial direction of the first current collector, the distance from the first through hole closest to the first pole connection area to the center of the first pole connection area is L1, and the distance from the radial outer edge of the first current collector to the center of the first pole connection area is L2. The ratio range of the distance L1 to the distance L2 is 0.15-0.95. Within the above range, effective heat dissipation of the current collecting assembly can be achieved without affecting the flow area of ​​the pole, which is beneficial to ensuring the performance of the battery.

[0010] In a second aspect, the present invention provides a battery pack comprising the battery as described above.

[0011] Since the battery pack of the present invention has the battery of the present invention and has the same beneficial effects as the battery, they will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 is a schematic diagram of a current collecting assembly in a battery of the present invention;

[0014] Figure 2 It is an exploded schematic diagram of the current collecting assembly in the battery of the present invention;

[0015] Figure 3 It is a schematic diagram of the exploded view of the battery of the present invention.

[0016] Description of reference numerals:

[0017] 1. First current collector; 101. First pole lug connection area; 102. First pole column connection area; 103. Radial outer edge of first current collector; 104. Circumferential outer edge of first current collector; 105. Protrusion;

[0018] 2. The second current collector;

[0019] 3. Insulation parts;

[0020] 4. a first through hole;

[0021] 5. a second through hole;

[0022] 6. The core is open. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] Combine the following Figure 1-Figure 3 , describing embodiments of the battery and battery pack of the present invention.

[0025] According to an embodiment of the present invention, on the one hand, a battery is provided, the battery comprising a battery cell, a pole and a current collecting assembly, the battery cell comprising a first pole ear and a second pole ear with opposite polarities, the first pole ear and the second pole ear being arranged on the same side of the battery cell; the current collecting assembly is electrically connected to the pole column, the first pole ear and the second pole ear, and the current collecting assembly comprises:

[0026] A first current collector 1, electrically connected to the first electrode tab;

[0027] A second current collecting member 2, electrically connected to the second electrode tab;

[0028] At least one first through hole 4 is arranged on the first current collector 1, and the first current collector 1 has a first pole lug connection area 101 and a first pole column connection area 102. The first pole lug connection area 101 is at least partially arranged around the first pole column connection area 102. The first through hole 4 is arranged in the first pole lug connection area 101. Along the radial direction of the first current collector 1, the distance from the first through hole 4 closest to the first pole column connection area 102 to the center of the first pole column connection area 102 is L1, and the distance from the radial outer edge 103 of the first current collector to the center of the first pole column connection area 102 is L2. The ratio range of distance L1 to distance L2 is 0.15-0.95.

[0029] In this battery, the current collecting assembly includes at least one first through hole 4, and the first through hole 4 is arranged on the first current collecting member 1. The air around the current collecting assembly can dissipate the heat of the current collecting assembly through the first through hole 4. Without increasing the overall size of the current collecting assembly, the first through hole 4 can increase the heat dissipation area of ​​the current collecting assembly and enhance the heat dissipation effect of the current collecting assembly, reduce heat accumulation on the top of the battery, and significantly improve the thermal runaway problem caused by poor heat dissipation, thereby ensuring battery performance.

[0030] In addition, since the closer the current collecting component is to the center of the first pole connection area, the greater the heat generated, the first through hole 4 should be as close as possible to the center of the first pole connection area 102. However, if the distance from the first through hole 4 to the center of the first pole connection area 102 is too close, the flow area of ​​the first pole connection area 102 will be reduced, affecting the flow of the pole, and if the distance from the first through hole 4 to the center of the first pole connection area 102 is too far, it is not conducive to the effective heat dissipation of the current collecting component. In the present invention, along the radial direction of the first current collecting component 1, the distance from the first through hole 4 closest to the first pole connection area 102 to the center of the first pole connection area 102 is L1, and the distance from the radial outer edge 103 of the first current collecting component to the center of the first pole connection area 102 is L2. The ratio range of the distance L1 to the distance L2 is 0.15-0.95. Within the above range, both effective heat dissipation of the current collecting component can be achieved without affecting the flow area of ​​the pole, which is conducive to ensuring the performance of the battery.

[0031] The battery of this embodiment includes a battery cell, a pole and a current collecting assembly. The battery cell includes a first pole ear and a second pole ear with opposite polarities. The first pole ear and the second pole ear are arranged on the same side of the battery cell. One of the first pole ear and the second pole ear is a positive pole ear, and the other is a negative pole ear. Therefore, the positive pole ear and the negative pole ear of the battery are led out on the same side. This battery is specifically a cylindrical battery.

[0032] In this embodiment, the current collecting assembly is a circular structure as a whole, so as to be suitable for cylindrical batteries. The current collecting assembly is electrically connected to the pole, the first pole lug and the second pole lug. Specifically, the current collecting assembly includes a first current collecting member 1, a second current collecting member 2 and at least one first through hole 4. Among them, one of the first current collecting member 1 and the second current collecting member 2 is a positive electrode current collecting disk, and the other is a negative electrode current collecting disk.

[0033] The positive collector disc is suitable for connecting to the positive electrode tab, and the negative collector disc is suitable for connecting to the negative electrode tab. Usually, the positive collector disc is welded to the positive electrode tab, and similarly, the negative collector disc is welded to the negative electrode tab. It should be noted that the positive electrode tab needs to be welded near the middle of the positive collector disc, and the negative electrode tab also needs to be welded near the middle of the negative collector disc to ensure the reliability of welding, ensure the current capacity, and facilitate the welding operation.

[0034] The first current collector 1 is electrically connected to the first pole tab. If the first current collector 1 is a positive current collector disk, the first pole tab is a positive pole tab accordingly. If the first current collector 1 is a negative current collector disk, the first pole tab is a negative pole tab accordingly. The second current collector 2 is electrically connected to the second pole tab. If the second current collector 2 is a positive current collector disk, the second pole tab is a positive pole tab accordingly. If the second current collector 2 is a negative current collector disk, the second pole tab is a negative pole tab accordingly. The first current collector 1 has a first pole tab connection area 101 and a first pole column connection area 102, and the first pole tab connection area 101 is at least partially arranged around the first pole column connection area 102. The first current collector 1 of this structure has a high structural strength, which is conducive to improving battery performance and reliability.

[0035] In this embodiment, the first current collector 1 is a negative electrode current collector disk, the second current collector 2 is a positive electrode current collector disk, the first pole ear is a negative pole ear, and the second pole ear is a positive pole ear. The first current collector 1 is made of copper, and the second current collector 2 is made of aluminum. It can be understood that the first current collector 1 and the second current collector 2 are both plate-like structures with a certain thickness. The thickness of the first current collector 1 and the second current collector 2 is usually thin, which can achieve connection with the corresponding pole ears and ensure connection strength on the one hand, and can also minimize heat generation on the other hand.

[0036] At least one first through hole 4 is provided on the first current collector 1. Specifically, the first through hole 4 is provided in the first tab connection area 101. The number of the first through holes 4 is set according to the size of the first current collector 1 and the heat dissipation requirements. For example, 1, 2, 4, 5, etc. first through holes 4 are provided. The first through hole 4 may be a regular through hole, such as a round hole, or an irregular through hole, such as a hole with a notch, which is not limited in the present application.

[0037] The first through hole 4 is used to enhance the heat dissipation performance of the first current collector 1. The first through hole 4 is a through structure. After the battery is assembled and the battery is working, the air around the current collector assembly can enter the first through hole 4 and dissipate the heat of the current collector assembly in a targeted manner through the first through hole 4, thereby improving the heat dissipation effect of the current collector assembly. Specifically, the first through hole 4 is a through hole, which means that the first current collector 1 is a plate-like structure, the first current collector 1 has two side surfaces, and when the first through hole 4 is provided in the first current collector 1, the first through hole 4 allows the two side surfaces of the first current collector 1 to be connected.

[0038] Along the radial direction of the first current collector 1, the distance from the first through hole 4 closest to the first pole connection area 102 to the center of the first pole connection area 102 is L1, the distance from the radial outer edge 103 of the first current collector to the center of the first pole connection area 102 is L2, and the ratio of the distance L1 to the distance L2 is in the range of 0.15-0.95. Within the above range, effective heat dissipation of the current collector assembly can be achieved without affecting the flow area of ​​the pole, which is conducive to ensuring the performance of the battery.

[0039] For example, the ratio of the distance L1 to the distance L2 may be 0.16, 0.2, 0.5, 0.9, etc.

[0040] Further, the first tab connection area 101 is fan-shaped, the first pole connection area 102 is circular, and the first tab connection area 101 is arranged around the first pole connection area 102 .

[0041] In this embodiment, if Figure 2 As shown, the first tab connection area 101 is fan-shaped, more precisely, the first tab connection area 101 is a quasi-fan-shaped structure, the first pole column connection area 102 is circular, the first pole column connection area 102 is arranged at the center of the first tab connection area 101, and the first tab connection area 101 is arranged around the first pole column connection area 102. In the first current collector 1 of this structure, the first tab connection area 101 and the first pole column connection area 102 can support each other, thereby improving the overall structural strength of the first current collector 1.

[0042] Optionally, the first electrode tab connection region 101 and the first electrode column connection region 102 are an integrated structure.

[0043] The arc-shaped outer edge of the first current collecting member 1 is the first current collecting member radial outer edge 103, and the straight outer edges on both sides of the first current collecting member 1 are the first current collecting member circumferential outer edges 104. The first current collecting member circumferential outer edge 104 is arranged along the sector radius, or in other words, the extension direction of the first current collecting member circumferential outer edge 104 is parallel to the extension direction of the sector radius. The two ends of the first current collecting member radial outer edge 103 are respectively connected to the outer ends of one of the first current collecting member circumferential outer edges 104.

[0044] Furthermore, along the circumference of the first current collecting member 1 , the first through holes 4 are arranged in the region of 2 / 5-3 / 5 of the first current collecting member 1 , and the ratio of the distance L1 to the distance L2 is in the range of 0.7-0.95.

[0045] The middle area of ​​the first current collector 1 is welded to the first pole ear, and the first through hole 4 cannot be set in the middle area of ​​the first current collector 1, otherwise it will affect the flow capacity of the first current collector 1 and the welding strength between the first pole ear and the first current collector 1. Along the circumference of the first current collector 1, the first through hole 4 is set in the area of ​​2 / 5-3 / 5 on the first current collector 1, that is, the first current collector 1 is evenly divided into five parts along the circumference, each part is a small fan-shaped area, from the circumferential outer edge 104 of one first current collector to the circumference of the circumferential outer edge 104 of another first current collector, wherein the first through hole 4 is set in the area of ​​2 / 5 to 3 / 5, for example, the first through hole 4 can be set in the area of ​​2 / 5, 1 / 2, 3 / 5, so that the first through hole 4 will not be located in the middle area of ​​the first current collector 1, ensuring the flow capacity of the first current collector 1 and the welding strength between the first pole ear and the first current collector 1.

[0046] At this time, the distance L1 from the first through hole 4 closest to the first pole connection area 102 to the center of the first pole connection area 102 needs to be set relatively large, and the lower limit of the ratio range of the distance L1 to the distance L2 is relatively large to ensure that the first through hole 4 avoids the middle area of ​​the first current collector 1. The ratio range of the distance L1 to the distance L2 is 0.7-0.95, for example, the ratio of the distance L1 to the distance L2 can be 0.72, 0.8, 0.94, etc.

[0047] Furthermore, a distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member is greater than or equal to 0.2 mm.

[0048] The setting position of the first through hole 4 cannot be too close to the radial outer edge 103 of the first current collecting part. If the setting position of the first through hole 4 is too close to the radial outer edge 103 of the first current collecting part, it will affect the flow capacity of the outside of the first current collecting part 1 and reduce the structural strength of the radial outer edge 103 of the first current collecting part. When heat is concentrated, the radial outer edge 103 of the first current collecting part is at risk of melting.

[0049] In this embodiment, the distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member is greater than or equal to 0.2 mm. For example, the distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member is 0.2 mm, 0.22 mm, 0.3 mm, 0.4 mm, etc. When the distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member meets the above range, the flow capacity of the outer side of the first current collecting member 1 will not be affected, and the structural strength at the radial outer edge 103 of the first current collecting member can be ensured, thereby significantly reducing the risk of fuse.

[0050] Further, when the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collecting member is less than or equal to 20 mm, the ratio of the distance L1 to the distance L2 is in the range of 0.15-0.8.

[0051] When the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collector is less than or equal to 20 mm, the first through hole 4 is arranged relatively close to the circumferential outer edge 104 of the first current collector, and will not affect the welding of the pole ear. Therefore, the first through hole 4 can be closer to the first pole connection area 102, so that the distance L1 is smaller, which can further enhance the heat dissipation effect. Therefore, the ratio range of the distance L1 to the distance L2 is preferably 0.15-0.8.

[0052] For example, when the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collecting member is 5 mm, 8 mm, 10 mm, 14 mm, 16 mm, 19 mm, or 20 mm, the ratio of the distance L1 to the distance L2 may be 0.16, 0.175, 0.32, 0.5, 0.65, 0.74, 0.79, or the like.

[0053] Furthermore, a distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member is greater than or equal to 0.5 mm.

[0054] When the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collector is less than or equal to 20 mm, the first through hole 4 is arranged relatively close to the circumferential outer edge 104 of the first current collector, and will not affect the welding of the pole ear. Therefore, the first through hole 4 can be closer to the first pole connection area 102, so that the distance L1 is smaller, which can further enhance the heat dissipation effect. At this time, the distance a between the first through hole 4 and the radial outer edge 103 of the first current collector is preferably greater than or equal to 0.5 mm.

[0055] For example, the distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member may be 0.5 mm, 0.6 mm, 0.76 mm, 0.9 mm, 1 mm, etc.

[0056] Furthermore, the area of ​​each first through hole 4 is S1, the number of the first through holes 4 is N, the total area of ​​the first current collecting member 1 is S, and N×S1 / S≤0.4.

[0057] The area of ​​each first through hole 4 is S1, and the number of first through holes 4 is N. Therefore, the total area of ​​all first through holes 4 is N×S1, the total area of ​​the first current collecting part 1 is S, and the ratio of the total area of ​​all first through holes 4 to the total area of ​​the first current collecting part 1 is less than or equal to 0.4, that is, N×S1 / S≤0.4.

[0058] Since the larger the area of ​​the first current collecting member 1 is, the greater the heat generated by the first current collecting member 1 is, the more first through holes 4 need to be provided, but if the number of first through holes 4 is too large, it will affect the structural strength of the first current collecting member 1. When the ratio of the total area of ​​all first through holes 4 to the total area of ​​the first current collecting member 1 satisfies the above relationship, the total area of ​​the first current collecting member 1 matches the total area of ​​the first through holes 4, which is conducive to controlling the heat generated by the first current collecting member 1, improving the heat dissipation performance of the first current collecting member 1, and ensuring the structural strength of the first current collecting member 1.

[0059] For example, the value of N×S1 / S may be 0.4, 0.3, 0.2, etc.

[0060] Furthermore, a plurality of first through holes 4 are arranged at intervals along the circumferential direction of the first current collecting member 1 .

[0061] There may be a plurality of first through holes 4 , and the plurality of first through holes 4 are spaced apart along the circumference of the first current collecting member 1 . In the present embodiment, there are two first through holes 4 , and the two first through holes 4 are spaced apart along the circumference of the first current collecting member 1 .

[0062] The circumferential spacing of the multiple first through holes 4 along the first current collector 1 will not affect the current flow capacity of the first current collector 1, the first current collector 1 will not produce a current flow bottleneck, and the middle area can be avoided relatively easily, ensuring the welding strength between the first current collector 1 and the first electrode tab.

[0063] Furthermore, the first through holes 4 are symmetrically arranged in the circumferential direction of the first current collecting member 1 with respect to the center line of the first current collecting member 1 .

[0064] The first current collecting member 1 is a fan-shaped structure, the arc-shaped outer edge of the first current collecting member 1 is the radial outer edge 103 of the first current collecting member, and the center line of the first current collecting member 1 refers to the line connecting the center of the first current collecting member 1 and the midpoint of the radial outer edge 103 of the first current collecting member.

[0065] A plurality of first through holes 4 are provided, and the plurality of first through holes 4 are symmetrically arranged in the circumferential direction of the first current collecting member 1 relative to the midline of the first current collecting member 1, so that the first through holes 4 are more evenly arranged on the first current collecting member 1, so that the heat dissipation effect of the first through holes 4 on the first current collecting member 1 is more balanced, and the heat of the first current collecting member 1 can be more evenly dissipated, thereby improving the heat dissipation performance of the battery.

[0066] In this embodiment, two first through holes 4 are provided, and the two first through holes 4 are symmetrically arranged with respect to the center line of the first current collecting member 1 in the circumferential direction of the first current collecting member 1 .

[0067] Furthermore, the area S1 of each first through hole 4 is ≥ 1 mm 2 .

[0068] In this embodiment, a plurality of first through holes 4 are arranged along the circumference of the first current collecting member 1, so that the first current collecting member 1 does not produce a flow bottleneck. Therefore, the area of ​​each first through hole 4 can be set relatively large, that is, the area S1 of each first through hole 4 is ≥ 1 mm 2 The first through hole 4 with a larger area can further improve the heat dissipation effect of the first current collecting member 1.

[0069] For example, the area S1 of each first through hole 4 is 1 mm 2 , 1.5 mm 2 , 2 mm 2 wait.

[0070] Furthermore, a distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collecting member is greater than or equal to 0.5 mm.

[0071] In this embodiment, the first current collecting member 1 is a fan-shaped structure, and the straight outer edges on both sides of the first current collecting member 1 are the first current collecting member circumferential outer edges 104, and the extension direction of the first current collecting member circumferential outer edges 104 is parallel to the extension direction of the fan-shaped radius.

[0072] The distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collector cannot be too small, otherwise it will affect the structural strength of the circumferential outer edge 104 of the first current collector, and the circumferential outer edge 104 of the first current collector will be easily melted when the heat is concentrated. In addition, the circumferential outer edge 104 of the first current collector 1 also needs to be connected and fixed. If the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collector is too small, it will also affect the connection and fixation of the circumferential outer edge 104 of the first current collector.

[0073] In this embodiment, the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collecting part is greater than or equal to 0.5 mm, so that the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collecting part will not be too small, which can ensure the structural strength of the circumferential outer edge 104 of the first current collecting part, eliminate the risk of melting, and will not affect the connection and fixation of the circumferential outer edge 104 of the first current collecting part.

[0074] For example, the distance b between the first through hole 4 and the circumferential outer edge 104 of the first current collecting member may be 0.5 mm, 0.6 mm, 0.8 mm, etc.

[0075] Furthermore, the first pole connection region 102 has a protrusion 105 , and the height of the protrusion 105 is in the range of 0.5 mm-10 mm.

[0076] In order to facilitate electrical connection between the first pole connection region 102 and the pole, a protrusion 105 is provided on the first pole connection region 102 .

[0077] If the height of the protrusion 105 is too low, the pole is easily overlapped with the first pole lug connection area 101, causing a short circuit risk, and if the height of the protrusion 105 is too high, the volume of the protrusion 105 is too large, which will affect the heat dissipation of the first current collector 1. In this embodiment, the height range of the protrusion 105 is 0.5mm-10mm. The height of the protrusion 105 within the above range can ensure that the protrusion 105 is reliably connected to the pole and will not overlap with the first pole lug connection area 101, and the volume of the protrusion 105 will not be too large, so as not to affect the heat dissipation performance of the first current collector 1.

[0078] For example, the height of the protrusion 105 may be 0.5 mm, 1 mm, 5 mm, 8.5 mm, 10 mm, etc.

[0079] Furthermore, the protrusion 105 protrudes in a direction away from the battery cell, and the protrusion 105 is a hollow structure.

[0080] In this embodiment, the protrusion 105 protrudes in a direction away from the battery cell, that is, the protrusion 105 protrudes in a direction close to the pole, so as to facilitate the electrical connection between the protrusion 105 and the pole. In addition, the protrusion 105 has a hollow structure inside, and air is contained in the hollow structure. The air has a heat-insulating effect, which can achieve balanced heat dissipation of the first pole lug connection area 101 and the first pole connection area 102, and can improve the heat dissipation performance of the first current collector 1.

[0081] Furthermore, the battery cell has a winding core opening 6 , and the winding core opening 6 at least partially overlaps with the orthographic projection of the protrusion 105 on the battery cell.

[0082] The battery cell has a winding core opening 6, specifically, the winding core opening 6 is arranged at the top of the battery cell, and the winding core opening 6 is used to dissipate heat inside the battery cell. The first current collector 1 is arranged above the battery cell, and the protrusion 105 has an opening toward one end of the battery cell, and the protrusion 105 has a positive projection on the battery cell.

[0083] In this embodiment, the orthographic projection of the core opening 6 and the protrusion 105 on the battery cell at least partially overlap, that is, the orthographic projection of the core opening 6 and the protrusion 105 on the battery cell can partially overlap or completely overlap. Since the protrusion 105 is a hollow structure with air inside, the core opening 6 and the orthographic projection of the protrusion 105 on the battery cell at least partially overlap, so that the core opening 6 is at least partially arranged toward the opening of the protrusion 105, and the internal air of the protrusion 105 can be used to achieve heat dissipation, thereby improving the heat dissipation effect on the battery cell.

[0084] Furthermore, an insulating member 3 is provided between the first current collecting member 1 and the second current collecting member 2 . The first current collecting member 1 is also provided with a second through hole 5 , and a portion of the insulating member 3 is inserted into the second through hole 5 to be connected with the first current collecting member 1 .

[0085] The current collecting assembly of the present embodiment is an integrated one-piece structure. Specifically, the first current collecting part 1 and the second current collecting part 2 are connected as an integrated structure through the insulating part 3, that is, the insulating part 3 is connected to the first current collecting part 1 and the second current collecting part 2 at the same time, so that the first current collecting part 1, the second current collecting part 2 and the insulating part 3 form an integral structure, which is the current collecting assembly.

[0086] Specifically, the insulating member 3 is made of insulating materials such as resin and plastic, and the first current collecting member 1, the second current collecting member 2 and the insulating member 3 can be connected together by hot melting, injection molding, etc. Of course, after the first current collecting member 1, the second current collecting member 2 and the insulating member 3 are connected, it should be ensured that the first current collecting member 1 and the second current collecting member 2 are kept insulated. It can be understood that the connection position of the insulating member 3 and the first current collecting member 1 and the second current collecting member 2 will not affect the setting of the first through hole 4, that is, the insulating member 3 will not cover the first through hole 4.

[0087] The first current collecting member 1 is further provided with a second through hole 5, and a portion of the insulating member 3 is inserted into the second through hole 5 to achieve the connection between the insulating member 3 and the first current collecting member 1. In this embodiment, the insulating member 3 and the first current collecting member 1 are connected by injection molding, and a portion of the insulating member 3 is integrated into the second through hole 5, which can increase the connection area and connection force between the insulating member 3 and the first current collecting member 1, and strengthen the connection effect between the insulating member 3 and the first current collecting member 1.

[0088] Furthermore, the area of ​​the second through hole 5 is smaller than the area of ​​the first through hole 4 .

[0089] Since the second through hole 5 is used to achieve the connection between the first current collecting part 1 and the insulating part 3, the area of ​​the second through hole 5 does not need to be too large, otherwise during injection molding, the insulating part 3 will not be easily fully connected with the surrounding wall of the second through hole 5, thereby affecting the connection effect between the first current collecting part 1 and the insulating part 3.

[0090] In this embodiment, the area of ​​the second through hole 5 is smaller than that of the first through hole 4. This arrangement is conducive to improving the connection effect between the first current collecting member 1 and the insulating member 3, and can also reduce the impact of the opening on the structural strength and current flow capacity of the first current collecting member 1.

[0091] Furthermore, the ratio of the area of ​​the second through hole 5 to the area of ​​the first through hole 4 is in the range of 0.8-1.

[0092] Since the second through hole 5 is used to achieve the connection between the first current collecting part 1 and the insulating part 3, if the area of ​​the second through hole 5 is too small, the injection molding connection with the insulating part 3 cannot be achieved, and if the area of ​​the second through hole 5 is too large, it will affect the structural strength and current flow capacity of the first current collecting part 1.

[0093] In this embodiment, the ratio of the area of ​​the second through hole 5 to the area of ​​the first through hole 4 is in the range of 0.8-1. Within the above ratio range, the area of ​​the second through hole 5 is neither too large nor too small, which can ensure the reliable connection between the first current collecting component 1 and the insulating component 3 without affecting the current flow capacity and structural strength of the first current collecting component 1.

[0094] For example, the ratio of the area of ​​the second through hole 5 to the area of ​​the first through hole 4 may be 0.85, 0.9, 0.92, etc.

[0095] Furthermore, the distance between the second through hole 5 and the second current collecting member 2 in the circumferential direction is greater than 1 mm.

[0096] The second through hole 5 needs to maintain a certain distance from the second current collecting part 2 in the circumferential direction. If the distance is too close, the second through hole 5 is difficult to set and it is easy to affect the structural strength of the first current collecting part 1. If the distance is too far, the heat dissipation effect of the second current collecting part 2 cannot be enhanced.

[0097] In this embodiment, the circumferential distance between the second through hole 5 and the second current collecting part 2 is greater than 1 mm, so that the second through hole 5 is neither too far nor too close to the second current collecting part 2, which can not only ensure the structural strength of the first current collecting part 1, but also enhance the heat dissipation effect of the second current collecting part 2.

[0098] For example, the distance between the second through hole 5 and the second current collecting member 2 in the circumferential direction may be 1.1 mm, 1.5 mm, 2 mm, etc.

[0099] Furthermore, the first through hole 4 is also provided on the second current collecting member 2 .

[0100] In order to further improve the heat dissipation performance of the current collecting assembly and prevent thermal runaway caused by heat concentration, a first through hole 4 is also provided on the second current collecting member 2 to enhance the heat dissipation performance of the second current collecting member 2 .

[0101] The second current collecting member 2 is also a fan-shaped structure, and the number of first through holes 4 provided on the second current collecting member 2 can be set according to the heat dissipation requirements and the space provided on the second current collecting member 2. In this embodiment, two first through holes 4 are provided on the second current collecting member 2, and the two first through holes 4 are provided at intervals along the circumference of the second current collecting member 2. In order not to affect the connection between the second current collecting member 2 and the second electrode tab, the two first through holes 4 are not provided in the central area of ​​the second current collecting member 2.

[0102] Furthermore, the thermal conductivity of the first current collecting member 1 is greater than that of the second current collecting member 2 , and the distance between the first through hole 4 on the second current collecting member 2 and the center of the first pole connecting area 102 is L3 , and the distance L3 is smaller than the distance L1 .

[0103] In this embodiment, the material of the first current collector 1 is copper, and the thermal conductivity of copper is 401 (W / mk), and its heat dissipation is good, while the material of the second current collector 2 is aluminum, and the thermal conductivity of aluminum is 237 (W / mk), and the heat dissipation of aluminum is poor. The thermal conductivity of the first current collector 1 is greater than that of the second current collector 2, and the heat dissipation performance of the first current collector 1 is better than that of the second current collector 2. Compared with the first current collector 1, the heat on the second current collector 2 is less likely to be dissipated and transmitted. Therefore, the first through hole 4 on the second current collector 2 should be closer to the center of the first pole connection area 102 to improve the heat dissipation performance of the second current collector 2.

[0104] In this embodiment, the distance between the first through hole 4 on the second current collector 2 and the center of the first pole connection area 102 is L3, and the distance L3 is smaller than the distance L1. The first through hole 4 on the second current collector 2 is closer to the center of the first pole connection area 102 than the first through hole 4 on the first current collector 1, which is beneficial to enhancing the heat dissipation of the second current collector 2, so that both the first current collector 1 and the second current collector 2 have better heat dissipation performance.

[0105] In other embodiments, the thermal conductivity of the first current collecting member 1 is smaller than that of the second current collecting member 2 , and the distance between the first through hole 4 on the second current collecting member 2 and the center of the first pole connecting area 102 is L3 , and the distance L3 is greater than the distance L1 .

[0106] In other embodiments, the thermal conductivity of the first current collector 1 can also be set to be smaller than the thermal conductivity of the second current collector 2. For example, the material of the first current collector 1 is aluminum, and the material of the second current collector 2 is copper. At this time, the first through hole 4 on the first current collector 1 should be closer to the center of the first pole connection area 102. Therefore, the distance between the first through hole 4 on the second current collector 2 and the center of the first pole connection area 102 is L3, and the distance L3 is greater than the distance L1, so as to enhance the heat dissipation performance of the first current collector 1.

[0107] Furthermore, two first through holes 4 are provided on the first current collector 1, and the two first through holes 4 and the line connecting the center of the first pole connection area 102 form an angle α, and the ratio range of the angle α to the central angle of the first current collector 1 is 0.5-1, and / or two first through holes 4 are provided on the second current collector 2, and the two first through holes 4 and the line connecting the center of the first pole connection area 102 form an angle β, and the ratio range of the angle β to the central angle of the second current collector 2 is 0.5-1.

[0108] Two first through holes 4 are provided on the first current collector 1, and the first through holes 4 are circular holes. The two first through holes 4 and the line connecting the center of the first pole connection area 102 form an angle α, that is, the center of the two first through holes 4 and the line connecting the center of the first pole connection area 102 form an angle α. If the angle α is too large, the first through hole 4 will interfere with the setting position of the insulating member 3. If the angle α is too small, the position of at least one of the two first through holes 4 is too close to the middle, affecting the welding of the pole ear on the first current collector 1. The ratio range of the angle α to the center angle of the first current collector 1 is 0.5-1. Within the above ratio range, the setting position of the first through hole 4 on the first current collector 1 will not interfere with the position of the insulating member 3, nor will it affect the connection of the pole ear. At the same time, it can enhance the heat dissipation performance of the first current collector 1 and reduce heat concentration.

[0109] Similarly, two first through holes 4 are provided on the second current collector 2, and the first through holes 4 are circular holes, and the two first through holes 4 and the line connecting the center of the current collector assembly form an angle β, that is, the line connecting the center of the two first through holes 4 and the center of the first pole connection area 102 forms an angle β. If the angle β is too large, the first through hole 4 will interfere with the setting position of the insulating member 3. If the angle β is too small, the position of at least one of the two first through holes 4 is too close to the middle, affecting the welding of the pole ear on the second current collector 2. The ratio range of the angle β to the center angle of the second current collector 2 is 0.5-1. Within the above ratio range, the setting position of the first through hole 4 on the second current collector 2 will not interfere with the position of the insulating member 3, nor will it affect the connection of the pole ear. At the same time, it can enhance the heat dissipation performance of the second current collector 2 and reduce heat concentration.

[0110] The angle values ​​of angle α and angle β can be the same or different. In the present embodiment, the ratio of angle α to the central angle of the first current collecting member 1 can be 0.6, 0.8, 0.95, etc., and the ratio of angle β to the central angle of the second current collecting member 2 can be 0.65, 0.7, 0.8, 0.9, etc.

[0111] Furthermore, the angle α is ≤60°, and the ratio of the distance L1 to the distance L2 is in the range of 0.15-0.8.

[0112] On the first current collector 1, the two first through holes 4 and the line connecting the center of the first pole connection area 102 form an angle α, and the angle α is ≤ 60°. For example, the angle α can be 60°, 55°, 40°, etc., as long as it does not affect the welding of the pole ear and the first current collector 1, so that the position of the first through hole 4 is closer to the area where heat is concentrated in the first current collector 1, so as to improve the heat dissipation effect of the first current collector 1.

[0113] Furthermore, a distance a between the first through hole 4 and the radial outer edge 103 of the first current collecting member is greater than or equal to 0.5 mm.

[0114] On the first current collector 1, the first through hole 4 should be arranged away from the central area to avoid affecting the welding between the pole ear and the first current collector 1. In this embodiment, the distance a between the first through hole 4 and the radial outer edge 103 of the first current collector is greater than or equal to 0.5 mm, for example, the distance a between the first through hole 4 and the radial outer edge 103 of the first current collector is 0.5 mm, 0.6 mm, 0.8 mm, etc., as long as it does not affect the welding between the pole ear and the first current collector 1, so that the position of the first through hole 4 is closer to the heat concentrated area of ​​the first current collector 1, so as to improve the heat dissipation effect of the first current collector 1.

[0115] This embodiment also provides a battery pack, including the battery as described above. Of course, the battery pack of this embodiment also includes structures and components that all existing battery packs have, which will not be described in detail.

[0116] The battery pack of this embodiment, including the battery of this embodiment, is provided with the first through hole 4 on the first current collector 1, which can reduce the heat accumulation at the current collector assembly, and can significantly improve the thermal runaway problem caused by poor heat dissipation, thereby ensuring the battery performance. Moreover, the location of the first through hole 4 can achieve effective heat dissipation of the current collector assembly without affecting the flow area of ​​the pole, which is conducive to ensuring the performance of the battery.

[0117] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises a battery cell, a pole and a current collecting assembly, wherein the battery cell comprises a first pole ear and a second pole ear with opposite polarities, wherein the first pole ear and the second pole ear are arranged on the same side of the battery cell; the current collecting assembly electrically connects the pole, the first pole ear and the second pole ear, and the current collecting assembly comprises: A first current collecting member (1) electrically connected to the first electrode tab, the first current collecting member (1) having an arc-shaped outer edge, the arc-shaped outer edge being a radial outer edge (103) of the first current collecting member; A second current collecting member (2) electrically connected to the second electrode tab; at least one first through hole (4) is arranged on the first current collector (1), the first current collector (1) having a first pole lug connection area (101) and a first pole column connection area (102), the first pole lug connection area (101) being arranged at least partially around the first pole column connection area (102), the first through hole (4) being arranged on the first pole lug connection area (101), and along the radial direction of the first current collector (1), the distance between the first through hole (4) closest to the first pole column connection area (102) and the center of the first pole column connection area (102) is L1, and the distance between the radial outer edge (103) of the first current collector and the center of the first pole column connection area (102) is L2, and the ratio of the distance L1 to the distance L2 is in the range of 0.15-0.95; An insulating member (3) is provided between the first current collecting member (1) and the second current collecting member (2), and the first current collecting member (1) is also provided with a second through hole (5), and a portion of the insulating member (3) is inserted into the second through hole (5) to be connected to the first current collecting member (1).

2. The battery according to claim 1, characterized in that The first pole lug connection area (101) is fan-shaped, the first pole column connection area (102) is circular, and the first pole lug connection area (101) is arranged around the first pole column connection area (102).

3. The battery according to claim 1, characterized in that Along the circumference of the first current collecting member (1), the first through hole (4) is arranged in an area ranging from 2 / 5 to 3 / 5 of the first current collecting member (1), and the ratio of the distance L1 to the distance L2 is in a range of 0.7 to 0.

95.

4. The battery according to claim 3, characterized in that The distance a between the first through hole (4) and the radial outer edge (103) of the first current collecting member is greater than or equal to 0.2 mm.

5. The battery according to claim 1, characterized in that The first current collecting member (1) has two straight outer edges, the two straight outer edges being the circumferential outer edges (104) of the first current collecting member, and when the distance b between the first through hole (4) and the circumferential outer edge (104) of the first current collecting member is less than or equal to 20 mm, the ratio of the distance L1 to the distance L2 is in the range of 0.15-0.

8.

6. The battery according to claim 5, characterized in that The distance a between the first through hole (4) and the radial outer edge (103) of the first current collecting member is greater than or equal to 0.5 mm.

7. The battery according to claim 1, characterized in that The area of ​​each of the first through holes (4) is S1, the number of the first through holes (4) is N, the total area of ​​the first current collecting member (1) is S, and N×S1 / S≤0.

4.

8. The battery according to claim 7, characterized in that A plurality of the first through holes (4) are arranged at intervals along the circumference of the first current collecting member (1).

9. The battery according to claim 8, characterized in that The first through holes (4) are symmetrically arranged in the circumferential direction of the first current collecting member (1) relative to the midline of the first current collecting member (1).

10. The battery according to claim 8, characterized in that The area S1 of each of the first through holes (4) is ≥ 1 mm 2 .

11. The battery according to claim 8, characterized in that The distance b between the first through hole (4) and the circumferential outer edge (104) of the first current collecting member is greater than or equal to 0.5 mm.

12. The battery according to claim 1, characterized in that The first pole connection area (102) has a protrusion (105), and the height of the protrusion (105) ranges from 0.5 mm to 10 mm.

13. The battery according to claim 12, characterized in that The protrusion (105) protrudes in a direction away from the battery core, and the protrusion (105) is a hollow structure.

14. The battery according to claim 12, characterized in that The battery core has a winding core opening (6), and the winding core opening (6) at least partially overlaps with the orthographic projection of the protrusion (105) on the battery core.

15. The battery according to claim 1, characterized in that The area of ​​the second through hole (5) is smaller than the area of ​​the first through hole (4).

16. The battery according to claim 1, characterized in that The ratio of the area of ​​the second through hole (5) to the area of ​​the first through hole (4) is in the range of 0.8-1.

17. The battery according to claim 1, characterized in that The distance between the second through hole (5) and the second current collecting member (2) in the circumferential direction is greater than 1 mm.

18. The battery according to any one of claims 1 to 17, characterized in that: The first through hole (4) is also provided on the second current collecting member (2).

19. The battery according to claim 18, characterized in that The thermal conductivity of the first current collecting member (1) is greater than the thermal conductivity of the second current collecting member (2), and the distance between the first through hole (4) on the second current collecting member (2) and the center of the first pole connection area (102) is L3, and the distance L3 is less than the distance L1.

20. The battery according to claim 18, characterized in that The thermal conductivity of the first current collecting member (1) is smaller than the thermal conductivity of the second current collecting member (2), and the distance between the first through hole (4) on the second current collecting member (2) and the center of the first pole connection area (102) is L3, and the distance L3 is greater than the distance L1.

21. The battery according to claim 18, characterized in that The first current collector (1) is provided with two first through holes (4), and a line connecting the two first through holes (4) and the center of the first pole connection area (102) forms an angle α, and the ratio of the angle α to the center angle of the first current collector (1) is in the range of 0.5-1, and / or the second current collector (2) is provided with two first through holes (4), and a line connecting the two first through holes (4) and the center of the first pole connection area (102) forms an angle β, and the ratio of the angle β to the center angle of the second current collector (2) is in the range of 0.5-1.

22. The battery according to claim 21, characterized in that The angle α is ≤60°, and the ratio of the distance L1 to the distance L2 is in the range of 0.15-0.

8.

23. The battery according to claim 22, characterized in that The distance a between the first through hole (4) on the first current collecting member (1) and the radial outer edge (103) of the first current collecting member is greater than or equal to 0.5 mm.

24. A battery pack, characterized in that: Comprising a battery as described in any one of claims 1-23.

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