Battery pack for outdoor operation equipment

Abstract

The utility model discloses a battery pack for outdoor operation equipment, and the battery pack for the outdoor operation equipment comprises a power output assembly which is set to output power so as to execute outdoor operation; the walking assembly is arranged to support the outdoor operation equipment to walk; the battery pack is characterized in that the battery pack comprises a shell which is detachably installed on outdoor operation equipment; the battery cells are arranged in the shell, the diameter of the battery is greater than or equal to 40mm, and the length of the battery cells is greater than or equal to 13.5 mm; wherein the ratio of the length of the battery cell to the width of the shell is greater than or equal to 0.7. According to the battery pack for the outdoor operation equipment, the ratio of the length of the battery cells to the width of the shell is set to be greater than or equal to 0.7, so that the space of the shell is utilized more sufficiently, and the battery cells are arranged more compactly, so that a larger space of the outdoor operation equipment cannot be occupied under the condition that a plurality of battery packs are placed on the outdoor operation equipment.

Description

Technical Field

[0001] This application relates to the technical field of battery packs, and particularly to a battery pack for outdoor working equipment. Background Art

[0002] A battery pack is generally formed by connecting multiple single cells in series and parallel, and a battery management system (BMS) is also added. It can be directly applied as an independent module to other devices.

[0003] However, for the existing battery packs for outdoor working equipment, the overall energy of the battery pack is small and cannot well adapt to the use of outdoor working equipment for large-area operations.

[0004] In view of this, it is necessary to provide an improved battery pack for outdoor working equipment to overcome the defects of the prior art. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the purpose of this application is to provide a battery pack for outdoor working equipment, which optimizes the structural layout of the battery pack.

[0006] The technical solution adopted by this application to solve the problems of the prior art is: A battery pack for outdoor working equipment, the outdoor working equipment includes: a power output component configured to output power to perform outdoor operations; a traveling component configured to support the outdoor working equipment to travel; the battery pack includes: a housing; a plurality of battery cells disposed in the housing, and the sum of the energies of the plurality of battery cells is not less than 2000 Wh; the energy density of the battery pack is greater than or equal to 0.28 Wh / cm 3 .

[0007] A further improvement is that: the energy density of the battery pack is greater than or equal to 0.3 Wh / cm 3 .

[0008] A further improvement is that: an installation track is further provided on the housing, and the ratio of the length of the installation track to the height of the battery pack is less than 0.5.

[0009] A further improvement is that: the diameter of the battery cell is greater than or equal to 4 cm, and the length of the battery cell is greater than or equal to 135 mm.

[0010] A further improvement is that: the length of the housing is less than or equal to 37.2 cm, the width of the housing is less than or equal to 17 cm, and the height of the housing is less than or equal to 23.9 cm.

[0011] A further improvement is that: the ratio of the length of the battery cell to the width of the housing is greater than or equal to 0.8.

[0012] A further improvement solution is that the number of the battery cells is not less than 32.

[0013] A further improvement solution is that an installation bracket for installing the battery cells is further arranged in the housing. The installation bracket includes a first bracket and a second bracket. Assembly parts for assembling the battery cells are arranged on both the first bracket and the second bracket, and limiting parts for fixing the battery cells are arranged in the assembly parts.

[0014] A further improvement solution is that the weight of the battery pack is greater than or equal to 15 kg.

[0015] A further improvement solution is that the capacity of the battery pack is greater than or equal to 30 Ah, and the ratio of the capacity of the battery pack to the weight is greater than or equal to 2 Ah / kg.

[0016] A further improvement solution is that the battery cell is a lithium iron phosphate battery cell or a ternary lithium battery cell.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The battery pack for outdoor working equipment of the present application can provide more energy per unit volume by increasing the energy density of the battery. Furthermore, in the limited space of the outdoor working equipment, a battery pack with higher energy can be assembled, improving the endurance of the outdoor working equipment. [Description of the Drawings]

[0019] The following further elaborates on the specific implementation manners of the present application with reference to the drawings:

[0020] Figure 1 is a three-dimensional view of the battery pack for outdoor working equipment according to an embodiment of the present application;

[0021] Figure 2 is a schematic structural diagram of the battery cell layout of the battery pack for outdoor working equipment according to an embodiment of the present application;

[0022] Figure 3 is a schematic internal structure diagram of the battery pack for outdoor working equipment according to an embodiment of the present application;

[0023] Figure 4 is a schematic structural diagram of the electrode connecting piece of the battery pack for outdoor working equipment according to an embodiment of the present application;

[0024] Figure 5 is a schematic structural diagram of the electrode connecting piece from another angle of the battery pack for outdoor working equipment according to an embodiment of the present application;

[0025] Figure 6It is a schematic diagram of the internal structure of a battery pack for an outdoor working device from another angle according to an embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of the structure of an electrode connecting piece of a battery pack for an outdoor working device according to an embodiment of the present application;

[0027] Figure 8 It is a schematic diagram of the structure of a battery cell structure of a battery pack for an outdoor working device according to an embodiment of the present application;

[0028] Figure 9 It is a schematic diagram of the positional relationship among a BMS board, positive and negative electrode plates, and conductive parts of a battery pack for an outdoor working device according to an embodiment of the present application;

[0029] Figure 10 It is a schematic diagram of the structure of a conductive part of a battery pack for an outdoor working device according to an embodiment of the present application;

[0030] Figure 11 It is a schematic diagram of the structure of a positive electrode plate of a battery pack for an outdoor working device according to an embodiment of the present application;

[0031] Figure 12 It is a schematic diagram of the structure of a second bracket of a battery pack for an outdoor working device according to an embodiment of the present application;

[0032] Figure 13 It is a schematic diagram of the second bracket of a battery pack for an outdoor working device from another angle according to an embodiment of the present application;

[0033] Figure 14 It is a schematic diagram of the second bracket of a battery pack for an outdoor working device from another angle according to an embodiment of the present application;

[0034] Figure 15 It is a schematic diagram of the second bracket of a battery pack for an outdoor working device from another angle according to an embodiment of the present application;

[0035] Figure 16 It is a schematic diagram of a battery pack for an outdoor working device with a shock-absorbing structure according to an embodiment of the present application;

[0036] Figure 17 It is a schematic diagram of the overall structure of an outdoor working device according to an embodiment of the present application;

[0037] Figure 18 It is a schematic diagram of the overall structure of an outdoor working device according to another embodiment of the present application;

[0038] Figure 19 It is a schematic diagram of the overall structure of an outdoor working device according to another embodiment of the present application;

[0039] Figure 20It is a schematic diagram of the overall structure of an outdoor working device according to another embodiment of the present application.

[0040] Meanings of the reference numerals in the figure:

[0041] 100, battery pack; 101, output cell group; 102, odd-row cell group; 103, even-row cell group; 104, mounting bracket; 1041, first bracket; 1042, second bracket; 105, first mating surface; 106, second mating surface; 107, assembly part; 108, limiting part; 109, electrode connecting piece; 1091, concave structure; 1092, protruding shape structure; 1093, second connecting part; 110, through hole; 111, BMS board; 112, positive electrode plate; 1121, first mating part; 1122, second mating part; 1123, inclined surface; 113, cell; 1131, end face; 1132, side wall; 1133, protruding structure; 114, negative electrode plate; 115, mounting seat; 116, conductive part; 1161, pin; 1162, fixing hole; 117, collecting part; 1171, first connecting part; 118, supporting part; 119, shock-absorbing structure; 120, plane; 121, handle; 122, heat dissipation slot; 123, limiting part; 200, main frame; 300, operation component; 400, seat; 500, traveling component; 600, power output component. [Specific Embodiments]

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0043] The battery pack for outdoor working devices is generally formed by connecting multiple single cells in series and parallel, and a battery management system (BMS, Battery Management Systems) is also added, which can be directly applied as an independent module to other devices.

[0044] However, for the existing battery packs for outdoor working devices, the layout of the cells is relatively traditional, generally with all cells arranged neatly or all cells arranged staggeredly. Such a setting sometimes cannot well adapt to the installation of other components inside the battery pack for outdoor working devices, resulting in insufficient utilization of the overall internal space of the battery pack for outdoor working devices.

[0045] Moreover, for the existing battery packs for outdoor working equipment, the heat dissipation efficiency of the battery cells is improved by staggering the battery cells, that is, the battery cell groups in adjacent different rows are arranged at different heights, and usually the battery cell groups at the two relatively most distal ends are selected as the positive and negative output terminals. Since the heights of the battery cell groups at both ends are different, the positive and negative electrode plates are often set to different lengths to adapt to the battery cell groups of different heights, so that the output ends of the positive and negative electrode plates are at the same height, and then the positive and negative electrode plates are connected to the BMS board at the same height. However, if electrode plates of different lengths are used for connection, it not only increases the complexity of the production of the positive and negative electrode plates, but also indirectly increases the assembly cost of the battery pack for outdoor working equipment.

[0046] Moreover, the battery cell group at the higher end will occupy the space of the battery pack for outdoor working equipment. In order to adapt to the installation of other components, the height of the battery pack for outdoor working equipment will be increased as a whole, making the overall space required by the battery pack for outdoor working equipment larger, which affects the compatibility of the battery pack for outdoor working equipment with other devices (such as outdoor working equipment or power tools).

[0047] Please refer to Figures 1 to 19 As shown in the figure, the battery pack 100 for outdoor working equipment according to an embodiment disclosed in the present application includes a housing and a plurality of battery cells 113 disposed in the housing. The plurality of battery cells 113 are configured as follows: a first battery cell group, including two output battery cell groups 101 having the same height on a plane 120, and the output battery cell groups 101 are configured to be connected to the positive or negative electrode of the battery pack 100 for outdoor working equipment to output electric energy; a second battery cell group, including an odd-row battery cell group 102 and an even-row battery cell group 103, and the odd-row battery cell group 102 and the even-row battery cell group 103 are arranged alternately on the plane 120; wherein, the height of the output battery cell group 101 is different from the height of both the odd-row battery cell group 102 and the even-row battery cell group 103.

[0048] By setting the height of the output battery cell group 101 for electric energy output to be different from the height of both the odd-row battery cell group 102 and the even-row battery cell group 103 in this way, the internal space of the battery pack 100 for outdoor working equipment can be fully utilized, making the space layout of the battery pack 100 for outdoor working equipment more reasonable.

[0049] Such as Figure 1 and Figure 6As shown, an installation bracket 104 is further provided inside the housing of the battery pack 100 for outdoor working equipment of the present application. A plurality of assembly parts 107 are provided inside the installation bracket 104, and the assembly parts 107 are used to assemble the battery cells 113. And the position layout of each assembly part 107 is set according to the layout of the battery cells 113. The installation bracket 104 includes a first bracket 1041 and a second bracket 1042 combined together. Assembly parts 107 are provided on both the first bracket 1041 and the second bracket 1042, and the assembly parts 107 on the first bracket 1041 and the second bracket 1042 are arranged correspondingly. Both ends of the battery cell 113 are mounted on the installation bracket 104 by being inserted into the assembly parts 107 on the first bracket 1041 and the second bracket 1042 respectively. After the first bracket 1041 and the second bracket 1042 are combined, they form a substantially square structure.

[0050] As Figure 2 shown, in a specific embodiment, the height h2 of the output battery cell group 101 is located between the height h1 of the odd-row battery cell groups 102 and the height h3 of the even-row battery cell groups 103. By setting the height h2 of the output battery cell group 101 between the height h1 of the odd-row battery cell groups 102 and the height h3 of the even-row battery cell groups 103, the output battery cell group 101 does not occupy additional space in the height direction, but is only arranged between the height h1 of the odd-row battery cell groups 102 and the height h3 of the even-row battery cell groups 103, saving the space occupied by the layout of the battery pack 100 for outdoor working equipment.

[0051] Furthermore, two rows of output battery cell groups 101 are respectively arranged at both ends in the arrangement direction of the second battery cell group. In the case where the height h2 of the two rows of output battery cell groups 101 is located between the height h1 of the odd-row battery cell groups 102 and the height h3 of the even-row battery cell groups 103, the two rows of output battery cell groups 101 are also located at both ends of the entire battery cell group layout. In this way, the battery cell groups enclose a square structure, and sufficient reserved space will be formed at the four corners of the square structure, and this reserved space area can be used to reinforce the structure of the installation bracket 104 at the four corners, so as to increase the strength of the installation bracket 104, and further increase the anti-drop ability and anti-impact ability of the battery pack 100 for outdoor working equipment.

[0052] Furthermore, at least one row of the two rows of output battery cell groups 101 is arranged between the second battery cell groups. Such a setting is beneficial for the output battery cell groups 101 to be closer in layout.

[0053] In a specific embodiment, the output battery cell group 101, the odd-row battery cell groups 102 and the even-row battery cell groups 103 have the same length. This makes the arrangement of the battery cells 113 more regular, and thus is beneficial for making the internal space layout of the housing more compact.

[0054] Please refer toFigure 2 In a specific embodiment, each of the first battery cell group and the second battery cell group includes an even number of battery cells 113, and the even number of battery cells 113 are connected in parallel in pairs. Preferably, the battery pack 100 for outdoor working equipment in the present application includes 32 battery cells 113, which are respectively arranged into 8 rows of battery cell groups, and each row of battery cell groups contains four battery cells 113. Among them, two rows are output battery cell groups 101, and the rest are 3 rows of odd-row battery cell groups 102 and 3 rows of even-row battery cell groups 103, and the adjacent two battery cells 113 in each row are connected in parallel to supply power externally. The 32 battery cells 113 can be set into 16 groups of two-by-two parallel-connected battery cells 113, and then the 16 groups of battery cells 113 are connected in series to output electric energy externally.

[0055] Of course, the number of battery cells 113 can also be set to 36 or 40, or more of other quantities.

[0056] In the present application, the length of the housing is less than or equal to 372 mm. Preferably, the length of the housing is 370 mm. The width of the housing is less than or equal to 170 mm. Preferably, the width of the housing is 160 mm. The height of the housing is less than or equal to 239 mm. Preferably, the height of the housing is 230 mm. And the battery cell 113 is preferably a cylindrical battery cell 113, and its diameter is generally greater than 38 mm. Preferably, the diameter is 40 mm. The length of the battery cell 113 is generally greater than or equal to 130 mm. Preferably, the length is 130 mm, or it can also be 135 mm.

[0057] In a specific embodiment, the sum of the energies of all the battery cells 113 in the battery pack 100 is not less than 2000 Wh, and the energy density of the battery pack is greater than or equal to 0.28 Wh / cm 3 , further, the energy density of the battery pack is greater than or equal to 0.3 Wh / cm 3 Preferably, the energy density of the battery pack is 0.5 Wh / cm 3 or 0.6 Wh / cm 3 . This enables the battery pack to provide higher energy per unit volume.

[0058] In a specific embodiment, the ratio of the length of the battery cell 113 to the width of the housing is greater than or equal to 0.7. Preferably, the ratio of the length of the battery cell 113 to the width of the housing is 0.8 or 0.9. During the assembly process, the axial direction of the battery cell 113 is parallel to the width direction of the housing. With such a ratio setting, the battery cell 113 can make full use of the size in the width direction of the housing. In the case of using the same type of battery cell 113, the size of the battery pack 100 is smaller, which helps the use of multiple such battery packs 100 on outdoor working equipment.

[0059] Further, the ratio of the width of the mounting bracket 104 to the width of the housing is not less than 0.9. Preferably, the ratio of the width of the mounting bracket 104 to the width of the housing is 0.9. The assembly of the mounting bracket 104 and the housing is also relatively compact, saving the space of the housing.

[0060] For the battery cell 113 of the present application, when charging the battery cell 113, the AC internal resistance during charging is less than or equal to 5 mΩ. Preferably, the AC internal resistance of the battery cell 113 during charging is 3 mΩ or 4 mΩ. When discharging the battery cell 113, the DC internal resistance of the battery cell 113 during discharging is less than or equal to 8 mΩ. Preferably, the DC internal resistance of the battery cell 113 during discharging is 6 mΩ. The charging limit voltage of the battery cell 113 is less than or equal to 5 V. Preferably, the charging limit voltage of the battery cell 113 is 3.8 V or 4 V.

[0061] Further, the charging cut-off current of the battery cell 113 is less than or equal to 1200 mAh. Preferably, the charging cut-off current of the battery cell 113 is 800 mAh or 1000 mAh. The standard discharge current of the battery cell 113 is greater than or equal to 10000 mAh. Preferably, the standard discharge current of the battery cell 113 is 15000 mAh or 20000 mAh.

[0062] The nominal voltage of a single battery cell 113 is greater than or equal to 3.2 V. Preferably, the nominal voltage is 3.2 V. The nominal capacity of the battery cell 113 is greater than or equal to 15 Ah. Preferably, the nominal capacity is 20 Ah, 30 Ah or 40 Ah.

[0063] The weight of the battery pack 100 for outdoor working equipment assembled from the above battery cells is greater than or equal to 11.4 Kg. Preferably, the weight is 16 Kg. The nominal energy of the battery pack 100 for outdoor working equipment is greater than or equal to 1.54 Kwh. Preferably, the nominal energy is 1.6 Kwh. The nominal voltage of the battery pack 100 for outdoor working equipment is greater than or equal to 51.2 V. Preferably, the nominal voltage is 58 V.

[0064] Further, the ratio of the capacity to the weight of the battery pack is greater than or equal to 2 Ah / kg.

[0065] In a specific embodiment, electrical connection terminals are provided at both ends of the battery pack 100. The electrical connection terminals are symmetrically arranged on the housing of the battery pack 100, so that the battery pack 100 can output electrical energy through the two electrical connection terminals. Compared with the method of outputting electrical energy using only one electrical connection terminal, the two electrical connection terminals of the present application can reduce the heat generated during the transmission of electrical energy.

[0066] Further, the distance between the electrical connection terminal and the bottom surface of the battery pack 100 is less than 30 mm, or the distance between the electrical connection terminal and the bottom surface of the battery pack 100 is less than 20 mm.

[0067] In a specific embodiment, the ratio of the cross-sectional area of a single battery cell 113 along its radial direction to the projected area of the battery pack 100 along its width direction is greater than or equal to 0.01. Compared with the battery packs 100 used in traditional outdoor working equipment, especially the battery packs 100 used in riding lawn mowers, the ratio of the cross-sectional area of the battery cell 113 in the present application along the radial direction to the projected area along its width direction is relatively large, so that the space inside the housing is fully utilized to assemble the battery cells 113. As a result, when the same battery cells 113 are installed, the battery pack 100 of the present application has a smaller volume and occupies less space.

[0068] In a specific embodiment, heat dissipation slots 122 are provided in both the upper and lower parts of the housing of the battery pack 100. A plurality of battery cells form a battery cell module, and the length of the battery cell module along its width direction is less than its length along the length direction. Such a setting is beneficial for the battery cells 113 to dissipate heat sufficiently through the heat dissipation slots 122.

[0069] As Figure 9 shown, in a specific embodiment, one row of the two rows of output battery cell groups 101 is used to connect the positive electrode plate 112, and the other row is used to connect the negative electrode plate 114. The positive electrode plate 112 and the negative electrode plate 114 have the same height. Since the positive electrode plate 112 and the negative electrode plate 114 also need to be connected to other components, other components connected to the positive electrode plate 112 and the negative electrode plate 114 can be kept horizontal relative to the positive electrode plate 112 and the negative electrode plate 114, making the spatial layout of the battery pack 100 for outdoor working equipment more compact in the height direction.

[0070] In a specific embodiment, the distance between the positive electrode plate 112 and the negative electrode plate 114 is greater than or equal to 200 mm. Such a setting can effectively prevent the situation of short circuit caused by the positive electrode plate 112 and the negative electrode plate 114 being wired together during assembly or use. Preferably, the distance between the positive electrode plate 112 and the negative electrode plate 114 is 200 mm or 225 mm.

[0071] As Figure 6 and Figure 7As shown, in a specific embodiment, a collecting member 117 for collecting information of a plurality of battery cells 113 is provided on the mounting bracket 104. A first connecting portion 1171 is provided on the collecting member 117. A plurality of electrode connecting pieces 109 are connected between the battery cells 113. A second connecting portion 1093 is provided on the electrode connecting piece 109. The first connecting portion 1171 is used to connect with the second connecting portion 1093. Further, the first connecting portion 1171 is an opening on the collecting member 117, and the second connecting portion 1093 is a connecting member capable of mating with the opening. The connecting member is a convex block that is in plug-in fit with the opening, and the convex block and the electrode connecting piece 109 are of an integrally formed structure. During the specific assembly process, after the connecting member is connected to the opening, the two are fixedly connected by welding.

[0072] As Figure 3 and Figure 6 shown, further, electrode connecting pieces 109 are connected to both ends of the plurality of battery cells 113. Along the direction parallel to the axis of the battery cell 113, the ratio of the projected area of the collecting member 117 to the total projected area of all the electrode connecting pieces 109 at one end of the battery cell 113 is greater than or equal to 1 / 3 and less than or equal to 1 / 2. Such a setting makes the area of the electrode connecting pieces 109 covered by the collecting member 117 smaller, which is beneficial to the heat dissipation of the battery cell 113, thereby helping the battery to exhibit an ideal charge and discharge state. Preferably, the ratio of the projected area of the collecting member 117 to the total projected area of all the electrode connecting pieces 109 at one end of the battery cell 113 is 1 / 3, 2 / 5 or 1 / 2.

[0073] As Figure 4 , Figure 5 and Figure 7 shown, the thickness of the electrode connecting piece 109 is greater than 0.5 mm and less than or equal to 1.8 mm, which is beneficial to improving the firmness of the connection between the electrode connecting piece 109 and the positive or negative electrode of the battery cell 113 to prevent the electrode connecting piece 109 from being welded through. Preferably, the thickness of the electrode connecting piece 109 is 0.6 mm, 1 mm, 1.5 mm or 1.8 mm.

[0074] In a specific embodiment, the sum of the numbers of the positive electrode plate 112, the negative electrode plate 114 and the electrode connecting piece 109 of the present application is 17. There are two collecting members 117 in total, and they are distributively arranged at both ends of the battery cell 113. Therefore, there are at least 17 collecting points on the two collecting members 117, and each collecting point distributively collects different positive electrode plates 112, negative electrode plates 114 and electrode connecting pieces 109.

[0075] As Figure 4 , Figure 5 and Figure 8As shown, further, a concave structure 1091 is provided in the area where the electrode connecting piece 109 is connected to the battery cell 113, and a protruding structure 1133 is provided at the end of the battery cell 113. When the electrode connecting piece 109 and the battery cell 113 are assembled, the protruding structure 1133 of the battery cell 113 is located within the concave structure 1091. This is beneficial for shortening the distance of the entire battery pack 100 for outdoor working equipment along the axial direction of the battery cell 113, making the battery pack 100 for outdoor working equipment compact in size. Specifically, both ends of the battery cell 113 are convex structures.

[0076] Of course, during the production and processing of the electrode connecting piece 109, the concave structure 1091 of the electrode connecting piece 109 is formed by stamping. As a result, a protruding-shaped structure 1092 is formed on the opposite side of the concave structure 1091 of the electrode connecting piece 109. The protruding structure 1133 of the battery cell 113 can also be connected to the protruding-shaped structure 1092 of the electrode connecting piece 109, which will create a sufficient heat dissipation gap between the end of the battery cell 113 and the electrode connecting piece 109, facilitating the heat dissipation of the battery cell 113.

[0077] As Figure 4 , Figure 5 and Figure 7 shown, further, the electrode connecting piece 109 can be a rhombus structure or a strip structure. In a specific embodiment, during assembly, a rhombus-structured electrode connecting piece 109 can be used at one end of the battery cell group, and a strip-structured electrode connecting piece 109 can be used at the other end. Of course, the electrode connecting pieces 109 of the same structure can be used at both ends of the battery cell group. For example, rhombus-structured electrode connecting pieces 109 (such as Figure 4 or Figure 5 ) can be used at both ends of the battery cell group, or strip-structured electrode connecting pieces 109 (such as Figure 7 ) can be used at both ends of the battery cell group.

[0078] Please also refer to Figure 9 and Figure 10 . In a specific embodiment, conductive members 116 are respectively connected between the BMS board 111, the positive electrode plate 112, and the negative electrode plate 114. One side of a conductive member 116 is used for being attached to the positive electrode plate 112 or the negative electrode plate 114, and the other side is used for being attached to the BMS board 111. By providing the conductive member 116 between the positive electrode plate 112 or the negative electrode plate 114 and the BMS board 111, the electrical contact between the two is made more stable.

[0079] As Figure 10, Further, a plurality of pins 1161 are provided at the edge of the conductive member 116, and jacks mating with the pins 1161 are provided on the BMS board 111. The conductive member 116 is a sheet-like structure. Preferably, the conductive member 116 is a square sheet-like structure. The pins 1161 are arranged around the square sheet-like structure, and the pins 1161 are arranged on the same side of the conductive member 116. During installation, the pins 1161 are inserted into the jacks, and then the conductive member 116 is welded to the BMS board 111 by welding, which increases the connection stability and firmness between the two. When assembling, the positive electrode plate 112 or the negative electrode plate 114 is located below, the conductive member 116 is in the middle, and the BMS board 111 is above. Then, the positive electrode plate 112 or the negative electrode plate 114 is connected to the BMS board 111 by screwing. The sheet-like conductive member 116 is beneficial to its full contact and fit with the BMS board 111 and the positive electrode plate 112 or the negative electrode plate 114, maintaining a good electrical signal connection. Of course, the connection between the positive electrode plate 112 or the negative electrode plate 114 and the BMS board 111 can also be other fixing methods, such as snap connection, bonding, soldering, etc., as long as the normal connection between the two can be ensured.

[0080] In a specific embodiment, the acquisition member 117 is connected to the BMS board 111 through a wire harness, so that the acquisition member 117 can timely transmit the information of the battery cell 113 collected to the BMS board 111, and then the BMS board 111 controls the charging and discharging of the battery cell 113. Of course, the connection between the acquisition member 117 and the BMS board 111 can also be other connection methods other than the wire harness.

[0081] In a specific embodiment, the extending direction of the BMS board 111 is parallel to the axial direction of the battery cell 113, making the layout between the BMS board 111 and the battery cell 113 more compact and saving space.

[0082] Please also refer to Figure 11 , In a specific embodiment, the outer surface of the mounting bracket 104 includes a first mating surface 105. A mounting seat 115 is provided on the mounting bracket 104, and a second mating surface 106 is included on the mounting seat 115. First mating portions 1121 and second mating portions 1122 are respectively provided on the positive electrode plate 112 and the negative electrode plate 114. The first mating portion 1121 is used to cooperate with the first mating surface 105, and the second mating portion 1122 is used to cooperate with the second mating surface 106. The setting of multiple mating portions increases the mounting stability of the positive electrode plate 112 and the negative electrode plate 114.

[0083] In a specific embodiment, a groove is formed on one surface of the mounting seat 115, and this groove is used to mount the BMS board 111. The BMS board 111 is fixed in the groove of the mounting seat 115 by screwing.

[0084] Further, both the first engaging portion 1121 and the second engaging portion 1122 of the positive electrode sheet 112 extend toward the same side of the positive electrode sheet 112, and both the first engaging portion 1121 and the second engaging portion 1122 of the negative electrode sheet 114 extend toward the same side of the negative electrode sheet 114. Specifically, the first engaging portion 1121 and the second engaging portion 1122 are part of the positive electrode sheet 112. After the first engaging portion 1121 is bent toward one side of the positive electrode sheet 112, it is bent again to form the second engaging portion 1122. Similarly, after the first engaging portion 1121 of the negative electrode sheet 114 is bent toward one side of the positive electrode sheet 112, it is bent again to form the second engaging portion 1122. In a specific operation, both the first engaging portion 1121 and the second engaging portion 1122 extend toward the side of the mounting bracket 104 to facilitate stable connection with the upper BMS board 111.

[0085] Further, an inclined surface 1123 is formed at the connection of the first engaging portion 1121 and the second engaging portion 1122 of the positive electrode sheet 112 or the negative electrode sheet 114, which cooperates with an inclined surface of the mounting seat 115 to increase the cooperation degree between the positive electrode sheet 112 or the negative electrode sheet 114 and the mounting seat 115, thereby increasing the stability of the installation of the positive electrode sheet 112 or the negative electrode sheet 114.

[0086] Please also refer to Figure 3 , in a specific embodiment, a limiting portion 123 is further provided on the mounting seat 115. The limiting portion 123 is used for limiting cooperation with the side surface of the positive electrode sheet 112 or the negative electrode sheet 114, further increasing the stability of the installation of the positive electrode sheet 112 or the negative electrode sheet 114. It is also beneficial for the operator to quickly cooperate the positive electrode sheet 112 or the negative electrode sheet 114 with the mounting seat 115 when installing the positive electrode sheet 112 or the negative electrode sheet 114, improving the assembly efficiency.

[0087] In a specific embodiment, in order to reduce the shaking of the battery cell 113 in the mounting bracket 104, a plurality of assembling portions 107 adapted to assemble the battery cell 113 are provided on the mounting bracket 104, and a limiting member 108 for limiting the movement of the battery cell 113 is provided in the assembling portion 107. Generally, the assembling portion 107 is an installation groove. During assembly, the battery cell 113 is assembled in the installation groove. Through the setting of the limiting member 108, the shaking of the battery cell 113 is restricted, usually restricting the shaking of the battery cell 113 in its axial and radial directions, which can effectively prevent the outer wall of the battery cell 113 from being damaged due to large shaking to prevent liquid leakage.

[0088] Further, the limiting member 108 protrudes from the inner wall of the assembly part 107 into the inner cavity of the assembly part 107, and the surface of the limiting member 108 cooperating with the battery cell 113 is a guiding surface. When the battery cell 113 is assembled into the assembly part 107, the guiding surface is conducive to guiding the movement of the battery cell 113 into the assembly part 107, and the interference fit between the limiting member 108 and the outer wall of the battery cell 113 realizes the limitation of the battery cell 113 in the assembly part 107.

[0089] Further, the battery cell 113 is a cylindrical battery cell 113, the assembly part 107 is a circular assembly part 107, and the ratio of the length of the limiting member 108 in the radial direction of the battery cell 113 to the diameter of the battery cell 113 is greater than or equal to 0.02 and less than or equal to 0.05. With such a setting, while ensuring that the limiting member 108 plays a limiting role on the battery cell 113, the limiting member 108 also occupies a relatively small space in the radial direction of the assembly part 107. Therefore, when planning the assembly part 107, the overall size of the assembly part 107 will not be occupied by a large size of the limiting member 108, which is helpful for the compact design of the battery pack 100 for outdoor operation equipment. Preferably, the ratio of the length of the limiting member 108 in the radial direction of the battery cell 113 to the diameter of the battery cell 113 is 0.02, 0.03 or 0.05.

[0090] Such as Figure 12 、 Figure 14 and Figure 15 In a specific embodiment, a support part 118 is provided at the end of the assembly part 107. In the axial direction of the battery cell 113, the ratio of the projected area of the support part 118 to the projected area of a single end face 1131 of the battery cell 113 is greater than or equal to 0.002 and less than or equal to 0.003. Such a setting is also to ensure that the limiting member 108 plays a limiting role on the battery cell 113 while making the limiting member 108 occupy a relatively small space.

[0091] The support part 118 is used to limit the battery cell 113 during assembly so that the battery cell 113 remains in the assembly part 107.

[0092] Please also refer to Figure 13, Further, in the axial direction of the battery cell 113, the ratio of the projected area of the support portion 118 to the projected area of the end face 1131 of a single battery cell 113 is greater than or equal to 0.0025 and less than or equal to 0.0028. Preferably, the ratio of the projected area of the support portion 118 to the projected area of the end face 1131 of a single battery cell 113 is 0.0025, 0.0026 or 0.0028. Such a setting makes the area of the support portion 118 smaller, and further makes the diameter of the through hole 110 at the end of the assembly portion 107 larger, which is beneficial to the heat dissipation of the battery cell 113 and also beneficial to the battery cell 113 to leak out more parts through the through hole 110 so as to be connected to the remaining electrode connecting pieces 109 or the positive electrode connecting piece or the negative electrode connecting piece.

[0093] In a specific embodiment, a limiting member 108 is provided at any one of the middle part and both ends of the assembly portion 107. Arranging a plurality of limiting members 108 in the axial direction of the battery cell 113 further helps to limit the shaking of the battery cell 113 in the assembly portion 107 and improves the stability of the battery cell 113.

[0094] Specifically, the limiting member 108 is a bump formed radially inwards from the inner wall of the assembly portion 107.

[0095] In a specific embodiment, a plurality of limiting members 108 are provided. Preferably, three limiting members 108 are provided on the inner wall of an assembly portion 107. The three limiting members 108 can be on the same horizontal plane 120 in the axial direction or on different horizontal planes 120.

[0096] Such as Figure 16 , In a specific embodiment, a shock-absorbing structure 119 is provided on the mounting bracket 104. Further, the shock-absorbing structure 119 is a shock-absorbing foam provided on the outer periphery of the mounting bracket 104. It is beneficial to buffer the shaking of the mounting bracket 104 and the battery cell 113 in the housing and reduce the occurrence of damage to the battery cell 113.

[0097] Such as Figure 1 , Further, heat dissipation slots 122 are provided on the housing. The heat dissipation slots 122 are provided on two opposite faces of the housing to facilitate convection. Specifically, they are provided in the up and down directions of the housing. The setting of the heat dissipation slots 122 is beneficial to dissipate the heat generated when the battery cell 113 is charged or discharged.

[0098] Such as Figure 1 , A handle 121 is provided on the upper part of the housing. Through the handle 121, it is beneficial to carry the battery pack 100 for outdoor work equipment so that the battery pack 100 for outdoor work equipment can be assembled with other equipment for charging or discharging the battery pack 100 for outdoor work equipment.

[0099] In a specific embodiment, the ratio of the area of the side wall 1132 of the battery cell 113 located within the assembly portion 107 to the area of the entire side wall 1132 of the battery cell 113 is greater than or equal to 1 / 3 and less than or equal to 1 / 2. Such a setting ensures that the area enclosed within the assembly portion 107 does not exceed half of the side wall 1132 of the battery, which is conducive to the heat dissipation of the battery cell 113 and alleviates the occurrence of spontaneous combustion. Preferably, the ratio of the area of the side wall 1132 of the battery cell 113 located within the assembly portion 107 to the area of the entire side wall 1132 of the battery cell 113 is 1 / 3, 2 / 5, or 1 / 2.

[0100] As Figure 17 , this application also provides an outdoor working device, which includes the above-mentioned battery pack 100 for outdoor working devices. The battery pack 100 for outdoor working devices includes: a housing and a plurality of battery cells 113 disposed within the housing; the plurality of battery cells 113 are configured as follows: a first battery cell group, including two rows of output battery cell groups 101 having the same height on a plane 120, and the output battery cell groups 101 are configured to be connected to the positive or negative electrode of the battery pack 100 for outdoor working devices to output electric energy externally; a second battery cell group, including an odd-row battery cell group 102 and an even-row battery cell group 103, and the odd-row battery cell group 102 and the even-row battery cell group 103 are arranged in an alternating manner on the plane 120; wherein, the height of the output battery cell groups 101 is different from the height of both the odd-row battery cell group 102 and the even-row battery cell group 103.

[0101] The outdoor working device includes a main frame 200, a seat 400, a power output assembly 600, a traveling assembly 500, an operation assembly 300, and a power supply device.

[0102] Furthermore, the main frame 200 extends in a first linear direction parallel to its front-rear direction on the working surface. Among them, the seat 400 is installed on the main frame 200 for the user to sit. The main frame 200 is also used to install the power output assembly 600, the traveling assembly 500, the operation assembly 300, and the power supply device. The power supply device is used to provide an energy source for the power-consuming units of the entire outdoor working device, such as enabling the cutting assembly to perform cutting operations, and enabling the traveling assembly 500 to support the main frame 200 and the related components on the main frame 200 to travel and for the power consumption of other power-consuming units. The power supply device includes a battery compartment and a battery pack, and the power supply device is specifically the above-mentioned battery pack 100 for outdoor working devices.

[0103] The power output component 600 is a workpiece for realizing the tool function. In this embodiment, the outdoor working device is a ride-on mower, and the power output component 600 is specifically a cutting component for outputting power to realize the mowing function of the ride-on mower. The cutting component is set to 2 groups or 3 groups. The cutting component is arranged below the main frame 200. In one embodiment, the cutting component includes: a cutter head, a mowing element, and a cutting motor. The mowing element is used for cutting vegetation such as grass when rotating at a high speed. For example, the mowing element is a blade for cutting the vegetation on the lawn. The cutter head forms a mowing space for accommodating the mowing element, and the mowing element is at least partially located in the mowing space. In some embodiments, the number of mowing elements can be 2, and correspondingly, the number of cutting motors is also 2. The two cutting motors independently drive the two mowing elements respectively. In some embodiments, the number of mowing elements can be 3, and correspondingly, the number of cutting motors is also 3. The three cutting motors independently drive the three mowing elements respectively.

[0104] Of course, the power output component 600 can also be detached from the outdoor working device. In some embodiments, it can be understood that the power output component 600 can be replaced by other components. Therefore, the outdoor working device can not only cut vegetation, but also replace the cutting component with functional components such as snow shoveling, snow sweeping, snow blowing, and flushing. Those skilled in the art should be able to adaptively replace various functional components without creative labor, and the above should all be included in the protection scope of this embodiment.

[0105] The traveling component 500 includes traveling wheels arranged on the main frame 200 and a traveling motor for driving the traveling wheels. The traveling wheels are arranged on both sides of the main frame 200 so that the center of gravity of the outdoor working device remains within the main frame 200 to reduce the probability of the outdoor working device tipping over during traveling. In one embodiment, the number of traveling wheels is set to 4, including 2 front traveling wheels and 2 rear traveling wheels. The front traveling wheels can be universal wheels. The traveling motor is connected to the rear traveling wheels and drives the rear traveling wheels to rotate. The 2 rear traveling wheels are both matched with the traveling motor, and the rotational speeds of the 2 traveling motors can be the same or different. When the user drives the outdoor working device straight, the rotational speeds of the two traveling motors are approximately the same; when the user drives the outdoor working device to turn, the rotational speeds of the two traveling motors are different, and the outdoor working device turns to the side with the lower rotational speed of the traveling motor. In some embodiments, the diameter of the front traveling wheels is smaller than that of the rear traveling wheels. Of course, the number of traveling wheels can also be set to 3 or 5.

[0106] In one embodiment, the traveling wheels can be configured as a traveling device of other structures for supporting the outdoor working device to travel.

[0107] The operating component 300 includes a left operating lever and a right operating lever disposed on the left and right sides of the outdoor working device. The user can control the outdoor working device to move forward, backward or turn by manipulating the left and right operating levers. The operating component 300 can also be a steering wheel capable of controlling the outdoor working device. This application also includes a braking component, which is disposed on the upper surface in front of the main frame 200 for the user to step on to control the operating state of the outdoor working device.

[0108] The power supply device is disposed at the rear of the outdoor working device. The power supply device includes a battery pack, a BMS control board for controlling the output and input of the battery pack, and a battery compartment for installing the battery pack. The battery pack is specifically the above-mentioned battery pack 100 for the outdoor working device. The battery pack is electrically connected to the electrical connection terminals on the battery compartment through the electrical connection terminals thereon to supply power to the outdoor working device. Preferably, the battery compartment can be set to accommodate battery packs with different capacitances to increase the adaptability of the outdoor working device to different battery packs. Among them, the battery pack 100 can also be removed to supply power to other electric tools, increasing the versatility of the battery pack. Compared with the traditional use of fossil fuels as the energy source, the outdoor working device of this application is more environmentally friendly and more in line with the long-term development plan. Preferably, the battery pack is preferably a lithium iron phosphate battery core or a ternary lithium battery core.

[0109] As Figure 18 、 Figure 19 and Figure 20 shown, it shows a schematic structural diagram of the outdoor working device in another embodiment.

[0110] The outdoor working device can be implemented as an agricultural working vehicle, specifically exemplified as a UTV vehicle, such as Figure 18 and Figure 19 or a tractor, such as Figure 20 . The battery compartment can be disposed at the front of the vehicle body of the UTV vehicle or the tractor. The battery compartment is provided with an openable battery compartment cover at the top, and the battery pack is disposed inside the battery compartment. Of course, the battery pack 100 can also be disposed under the seat of the UTV vehicle or the tractor.

[0111] The connection between the battery pack 100 and the UTV vehicle or the tractor is a detachable connection for facilitating the replacement of the battery pack 100.

[0112] In this embodiment, the operating component 300 is a steering wheel 300 on the UTV vehicle or the tractor. The steering wheel 300 can be used to control the steering of the UTV vehicle or the tractor, and a display screen can be positioned on the steering wheel 300.

[0113] Specifically, the display screen can display the power of the battery pack 100, which helps the user to judge the working area of the outdoor working device according to the remaining power to replace the battery pack 100.

[0114] The display screen can also display the information of the battery cell 113 collected in real time by the electrode connecting piece 109, the positive electrode piece 112 or the negative electrode piece 114, which is convenient for users or maintenance personnel to accurately obtain the position of the faulty battery cell 113 in case of a fault, so as to perform timely maintenance or replacement of the battery cell 113.

[0115] Of course, the display screen can also display the operating temperature of the battery pack 100. Since too high or too low temperature will affect the actual battery life, and too high temperature will cause spontaneous combustion of the battery pack 100, resulting in dangerous accidents. By means of the display screen, the situation of the operating temperature of the battery pack 100 can be understood in time, and corresponding measures can be taken, such as shutting down and other processing methods.

[0116] The steering wheel 300 is located in front of the seat on the vehicle frame, and its upper surface can be inclined at a certain angle towards the seat, which is convenient for the user to operate the steering wheel 300 and can be more oriented towards the user's face, so as to facilitate the user to view the display screen. The steering wheel 300 can also be set to a structure with adjustable angle to meet the needs of different users for the tilt angle of the display screen. The steering wheel 300 can also be set to be adjustable in height. When users of different heights use it, it can be adjusted according to their own height requirements. The height of the steering wheel can be adjusted manually or electrically.

[0117] Exemplarily, Figure 18 and Figure 19 both are UTV vehicles. Among them, Figure 18 the one shown is a UTV vehicle with a single-row seat, Figure 19 and the one shown is a UTV vehicle with a double-row seat. Attachment mechanisms, such as a carrying bucket, etc., can be provided at the tails of both the UTV vehicle with a single-row seat and the UTV vehicle with a double-row seat.

[0118] Exemplarily, Figure 20 the one shown is a tractor, and a trailer can be mounted at its tail.

[0119] This application is not limited to the above specific embodiments. Those of ordinary skill in the art can easily understand that, without departing from the principles and scope of this application, there are many alternative solutions for the battery pack for outdoor working equipment of this application. The protection scope of this application shall be subject to the content of the claims.

Claims

1. A battery pack for outdoor working equipment, the outdoor working equipment comprising: A power output assembly configured to output power to perform outdoor work; A walking assembly, configured to support the outdoor working equipment in walking; Characterized in that the battery pack comprises: case; A plurality of battery cells are arranged in the housing, and the sum of the energy of the plurality of battery cells is not less than 2000Wh; The energy density of the battery pack is greater than or equal to 0.28Wh / cm 3 .

2. The battery pack for outdoor working equipment according to claim 1, characterized in that: The energy density of the battery pack is greater than or equal to 0.3Wh / cm 3 .

3. The battery pack for outdoor working equipment according to claim 1, characterized in that: The shell is also provided with a mounting track, and the ratio of the length of the mounting track to the height of the battery pack is less than 0.

5.

4. The battery pack for outdoor working equipment according to claim 1, characterized in that: The diameter of the battery core is greater than or equal to 40 mm, and the length of the battery core is greater than or equal to 135 mm.

5. The battery pack for outdoor working equipment according to claim 1, characterized in that: The length of the shell is less than or equal to 372 mm, the width of the shell is less than or equal to 170 mm, and the height of the shell is less than or equal to 239 mcm.

6. The battery pack for outdoor working equipment according to claim 1, characterized in that: The ratio of the length of the battery core to the width of the shell is greater than or equal to 0.

8.

7. The battery pack for outdoor working equipment according to claim 1, characterized in that: The number of the battery cells is no less than 32.

8. The battery pack for outdoor working equipment according to claim 1, characterized in that: The shell is also provided with a mounting bracket for mounting the battery cell, and the mounting bracket includes a first bracket and a second bracket, and both the first bracket and the second bracket are provided with an assembly part for assembling the battery cell, and the assembly part is provided with a limiting member for fixing the battery cell.

9. The battery pack for outdoor working equipment according to claim 1, characterized in that: The weight of the battery pack is greater than or equal to 15 kg.

10. The battery pack for outdoor working equipment according to claim 1, characterized in that: The capacity of the battery pack is greater than or equal to 30Ah, and the ratio of the capacity to weight of the battery pack is greater than or equal to 2Ah / kg.

11. The battery pack for outdoor working equipment according to claim 1, characterized in that: The battery cell is a lithium iron phosphate battery cell or a ternary lithium battery cell.

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