Outdoor electric tool and battery pack thereof

Abstract

The invention discloses an outdoor electric tool and a battery pack thereof. The tool comprises a tool main body; the walking wheel set is arranged to support the tool main body; the walking motor is arranged to drive the walking wheel set to walk; the battery pack mounting part is arranged on the tool main body and is used for mounting at least one battery pack; the battery pack includes: a case; the at least one battery cell module comprises a plurality of battery cells and is arranged in the shell; at least part of the battery cell is soaked in the cooling liquid; the battery pack further comprises a heating device which is arranged in the shell so as to heat the cooling liquid.

Description

Technical Field

[0001] The present application relates to an energy storage device, and in particular to an outdoor power tool and a battery pack thereof. Background Art

[0002] Outdoor wheeled tool equipment is used for outdoor operations. For example: multi-purpose vehicles, agricultural machinery vehicles, farmer's vehicles, beach cars, golf carts, riding lawn mowers, etc. When these devices are working outdoors, the equipment needs to carry some energy storage devices. The energy storage devices of existing outdoor walking equipment can basically be divided into two categories, one of which uses gasoline, diesel and other fuels as energy storage devices, and the other uses electric energy storage devices as energy storage devices, such as high-power battery packs. Battery packs are more environmentally friendly and energy-efficient than fuels, and thus have been more popular with users and manufacturers in recent years. As a result, battery safety issues of outdoor wheeled tool equipment powered by battery packs have received widespread attention, such as the thermal runaway problem of battery packs. Among the ways to solve the problem of thermal runaway of battery packs, there is a solution that uses coolant to cool down. In addition to reducing or eliminating the impact of thermal runaway of battery packs, the coolant also has other functions. Summary of the invention

[0003] In order to address the deficiencies of the prior art, the purpose of the present application is to provide a battery pack with higher safety performance and an outdoor wheeled tool using the battery pack.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions: An outdoor wheeled tool comprises: a tool body; a travel wheel group, configured to support the tool body; a travel motor, configured to drive the travel wheel group to travel; a battery pack mounting portion, arranged on the tool body, for mounting at least one battery pack; the battery pack comprises: a shell; at least one battery cell module, including a plurality of battery cells, arranged in the shell; at least part of the battery cells is immersed in a coolant; the battery pack further comprises: a heating device, arranged in the shell to heat the coolant.

[0005] In one embodiment, the battery cell module further includes a battery cell bracket; the battery cell bracket is configured to support the battery cell; wherein the battery cell bracket at least seals and supports the positive terminal surface and the negative terminal surface of the battery cell.

[0006] In one embodiment, the heating device heats the coolant when the temperature is lower than a temperature threshold.

[0007] In one embodiment, the battery pack further includes at least one detection device, configured to at least detect the temperature of the battery cell module; and a controller, configured to control the heating device to start heating the coolant when the temperature of the battery cell module is less than a temperature threshold.

[0008] In one embodiment, the heating device at least includes a resistance wire or a heating film or a heating rod.

[0009] In one embodiment, the heating device is at least partially immersed in the cooling liquid.

[0010] An electric tool comprises: a tool body; a battery pack mounting portion, arranged on the tool body, for mounting at least one battery pack; the battery pack comprises: a shell; a battery cell module, comprising a plurality of battery cells, arranged in the shell; the shell at least forms: a first accommodating chamber to accommodate the battery cell module; a second accommodating chamber to at least store a coolant; the battery pack further comprises: a heating device, arranged in the second accommodating chamber to heat the coolant; the first accommodating chamber and the second accommodating chamber are at least partially connected.

[0011] In one embodiment, the positive terminal surfaces and the negative terminal surfaces of the plurality of battery cells at least do not contact the coolant.

[0012] In one embodiment, the battery cell module further includes a battery cell bracket; the battery cell bracket is configured to support the battery cell; wherein the battery cell bracket at least seals and supports the positive terminal surface and the negative terminal surface of the battery cell.

[0013] In one embodiment, the heating device heats the coolant when the temperature is lower than a temperature threshold.

[0014] In one embodiment, the first accommodating cavity and the second accommodating cavity are disposed adjacent to each other, and at least one connecting hole is disposed on a cavity wall between the first accommodating cavity and the second accommodating cavity to connect the first accommodating cavity and the second accommodating cavity.

[0015] A battery pack suitable for outdoor electric equipment comprises: a shell; a battery cell module, including multiple battery cells, arranged in the shell; the shell at least forms: a first accommodating chamber to accommodate the battery cell module; a second accommodating chamber to store at least a coolant; the battery pack also comprises: a heating device, arranged in the second accommodating chamber to heat the coolant; the first accommodating chamber and the second accommodating chamber are at least partially connected.

[0016] A riding lawn mower comprises: a casing; a seat mounted to the casing; a walking wheel assembly comprising walking wheels supporting the casing; a walking motor driving the walking wheels to rotate; a mowing assembly comprising a mowing element for mowing grass; a driving motor driving the mowing assembly to mow grass; a battery pack mounting portion for mounting a battery pack for powering the walking motor; the battery pack comprises: a casing; a battery cell module comprising a plurality of battery cells arranged in the casing; the casing at least forms: a first accommodating chamber to accommodate the battery cell module; a second accommodating chamber to at least store a coolant; the battery pack further comprises: a heating device arranged in the second accommodating chamber to heat the coolant; the first accommodating chamber and the second accommodating chamber are at least partially connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of various outdoor wheeled equipment in one embodiment proposed in the present application; Figure 2a is a perspective view of a riding lawn mower according to an embodiment of the present application; Figure 2b is a perspective view of a riding lawn mower according to another embodiment of the present application; Figure 3 is a structural diagram of a battery pack according to an embodiment of the present application; Figure 4 It is a schematic diagram of the structure of a battery cell support according to an embodiment of the present application; Figure 5 It is a schematic diagram of the structure of a battery cell support according to an embodiment of the present application; Figure 6 It is a schematic diagram of a battery cell module structure diagram of an embodiment proposed in the present application; Figure 7 is a schematic diagram of the structure inside a battery pack housing of an embodiment proposed in the present application; Figure 8 is a schematic diagram of a structure in which a coolant is arranged in a battery pack according to an embodiment of the present application; Fig. 9 It is a schematic diagram of the arrangement of cooling modules of a battery pack according to an embodiment of the present application; Fig.10 It is a schematic diagram of the internal structure of a battery pack shell according to an embodiment of the present application; Fig.11 It is a schematic diagram of providing a heat dissipation housing for a battery cell module according to an embodiment of the present application; Fig.12 It is a schematic diagram of providing a heat dissipation housing for a battery cell module according to an embodiment of the present application; Fig.13 It is a structural schematic diagram of a heat dissipation housing according to an embodiment of the present application; Fig.14 is a schematic diagram of an air intake portion of a heat dissipation housing according to an embodiment of the present application; Fig.15 It is a schematic diagram of the internal structure of a battery pack shell according to an embodiment of the present application; Fig.16 It is a schematic diagram of the internal structure of a battery pack shell of an embodiment proposed in the present application. DETAILED DESCRIPTION

[0018] The present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application, rather than all structures, are shown in the accompanying drawings.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used in this application specification are only for describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items. In addition, the character " / " in this article generally indicates that the related objects before and after are in a "or" relationship.

[0020] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, and rear side do not represent the positive direction, and can also be understood as the lateral direction. For example, the bottom can include directly below, lower left, lower right, lower front, and lower rear, etc.

[0021] It will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," substantially, etc.) used in conjunction with quantities or conditions are inclusive of the values ​​and have the meaning indicated by the context (e.g., the term includes at least the degree of error associated with the measurement of the specific value, the tolerance associated with the specific value (e.g., manufacturing, assembly, use), etc.). Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Of course, numerical values ​​that do not adopt relative terms should also be disclosed as specific values ​​with tolerances.

[0022] It should be noted that the “first, second, third, fourth” etc. in this embodiment can be understood as terms set to distinguish different components or devices, rather than terms set for sorting.

[0023] In this embodiment, a variety of different types of outdoor wheeled equipment 200 can be powered by the battery pack 100 . Figure 1 Several common wheeled devices are illustrated, such as a riding lawn mower 200a, a snow blower 200b, an all-terrain vehicle 200c, a push lawn mower 200d, and a mobile power supply device 200e, etc. It should be noted that various other common wheeled devices that can be powered by the battery pack 100 are also within the protection scope of the present application, such as a mobile power supply device (English translation: powerstation), a wheeled fan, a wheeled lighting device, a wheeled blower, a cleaning vehicle, etc. In this embodiment, the outdoor wheeled device 200 may also be referred to as an outdoor wheeled tool 200.

[0024] In the following implementation mode, Figure 1 The riding lawn mower 200a shown in FIG. Figure 2a The riding lawn mower 200a may include at least a frame 21, a running wheel 22 supporting the frame 21, a motor 23 capable of at least driving the running wheel 22, and a battery compartment 24 for accommodating the battery pack 100. The lawn mower 200a may also include a seat 25 and an operating assembly 26 disposed on the frame 21, wherein the operating assembly 26 may include an operating lever 261, a steering wheel 262, or a pedal 263, etc. The lawn mower 200a may also include a cutting assembly 27 disposed at the lower end of the frame 21, or a lighting device 28 disposed at the front end of the frame 21, etc.

[0025] In some embodiments, the battery compartment 24 may be disposed at the rear end, front end, bottom end, or side of the frame 21 . Figure 2a In the lawn mower 200a shown, the battery compartment 24 is arranged at the front end of the frame 21. Figure 2b In the lawn mower 200a shown, the battery compartment 24 is arranged at the rear end of the frame 21. The positions where the battery compartment 24 is arranged on the lawn mower 200a or other wheeled tools are not listed here one by one.

[0026] In one embodiment, the battery compartment 24 can be integrally formed with the frame 21, that is, the frame 21 can form the battery compartment 24. In one embodiment, the battery compartment 24 can be detachably mounted on the frame 21, that is, the frame 21 can form a battery compartment mounting portion (not shown) to mount the battery compartment 24. In one embodiment, the lawn mower 200a may include a battery compartment 24 integrally formed with the frame 21, and also include a battery compartment 24 detachably mounted on the frame 21. In one embodiment, the battery pack 100 can be detachably mounted in the battery compartment 24, or can be fixedly mounted in the battery compartment 24 or built into the battery compartment 24.

[0027] In one embodiment, the battery compartment 24 is at least partially made of a metal material.

[0028] In this embodiment, the battery compartment 24 can accommodate one or more battery packs 100. In this embodiment, the discharge order or discharge method of the multiple battery packs 100 in the battery compartment 24 to power the lawn mower 200a is not specifically limited. For example, the multiple battery packs 100 can be connected in series to power the lawn mower 200a, or can be discharged in parallel, or can be discharged in sequence, etc. Or a battery pack in the battery compartment 24 can discharge to other battery packs.

[0029] In one embodiment, the battery pack 100 can be removed from the lawn mower 200a to power other power tools, such as handheld tools, such as drills, pruning machines, sanders, etc., and can also power other wheeled power tools, such as snow blowers, and can also power hand-push power tools, such as hand-push lawn mowers and hand-push snow blowers. It can also power bench tools, garden tools, decoration tools, vegetation care tools, or different types of tools such as drills and saws. In other words, the battery pack 100 can at least be a battery pack that is universal for a variety of power tools.

[0030] In this embodiment, the nominal voltage of the battery pack 100 is greater than or equal to 30V. Of course, it is understandable that the nominal voltage of the battery pack 100 may be greater than or equal to 20V and less than or equal to 100V, or the nominal voltage of the battery pack 100 may be greater than or equal to 36V and less than or equal to 80V, or the nominal voltage of the battery pack 100 may be greater than or equal to 40V and less than or equal to 60V. Or the nominal voltage of the battery pack 100 may be greater than or equal to 100V and less than or equal to 800V. It is understandable that the nominal voltage of the battery pack 100 may be 20V, 24V, 36V, 40V, 48V, 56V, 60V, 80V, 100V, 400V, 800V. In this way, the voltages of different battery packs of an outdoor wheeled device 100 using multiple battery packs 100 can take into account the voltage platforms of other battery packs, thereby increasing the total energy of the battery packs in the wheeled device. When at least two battery packs 100 are installed in the outdoor wheeled equipment 100 , the nominal voltages of the at least two battery packs 100 may be the same or different.

[0031] The weight of the battery pack 100 is greater than or equal to 10 kg. Alternatively, the weight of the battery pack 100 is greater than or equal to 15 kg. Alternatively, the weight of the battery pack 100 is greater than or equal to 16 kg. Alternatively, the weight of the battery pack 100 is greater than or equal to 17 kg. Alternatively, the weight of the battery pack 100 is greater than or equal to 18 kg. Alternatively, the weight of the battery pack 100 is greater than or equal to 19 kg. Alternatively, the weight of the battery pack 100 is greater than or equal to 20 kg. The weight energy density of the battery pack is greater than or equal to 100 wh / kg and less than or equal to 200 wh / kg. Alternatively, the weight energy density of the battery pack 100 is greater than or equal to 120 wh / kg and less than or equal to 200 wh / kg. Alternatively, the weight energy density of the battery pack 100 is greater than or equal to 100 wh / kg and less than or equal to 150 wh / kg. Alternatively, the weight energy density of the battery pack 100 is greater than or equal to 150 wh / kg and less than or equal to 200 wh / kg. The volume energy density of the battery pack 100 is greater than or equal to 100wh / L and less than or equal to 200wh / L. Alternatively, the volume energy density of the battery pack 100 is greater than or equal to 150wh / L and less than or equal to 200wh / L. Alternatively, the volume energy density of the battery pack 100 is greater than or equal to 90wh / L and less than or equal to 200wh / L. Alternatively, the volume energy density of the battery pack 100 is greater than or equal to 100wh / L and less than or equal to 150wh / L. A higher weight energy density or volume energy density allows the outdoor wheeled equipment 100 to obtain more energy when installing a battery pack of the same volume or weight, thereby ensuring the endurance of the wheeled equipment. For example, it can ensure that the wheeled equipment can work outdoors for half a day, while also taking into account the size or load requirements of the equipment itself.

[0032] The total energy of the battery pack 100 is greater than or equal to 1 kw·h and less than or equal to 8 kw·h. Alternatively, the total energy of the battery pack 100 is greater than or equal to 1 kw·h and less than or equal to 4 kw·h. Alternatively, the total energy of the battery pack 100 is greater than or equal to 500 w·h and less than or equal to 2 kw·h. Alternatively, the total energy of the battery pack 100 is greater than or equal to 2 kw·h and less than or equal to 6 kw·h. Alternatively, the total energy of the battery pack 100 is greater than or equal to 4 kw·h and less than or equal to 8 kw·h. Alternatively, the total energy of the battery pack 100 is greater than or equal to 300 w·h and less than or equal to 8 kw·h. In this way, when at least one battery pack 100 in the outdoor wheeled equipment 100 is in a fully charged state, the outdoor wheeled equipment 100 can mow the lawn for 4 to 6 hours using the battery pack 100.

[0033] The rated discharge power of the battery pack 100 is greater than or equal to 2kw and less than or equal to 8kw. Alternatively, the rated discharge power of the battery pack 100 is greater than or equal to 3kw and less than or equal to 8kw. Alternatively, the rated discharge power of the battery pack 100 is greater than or equal to 4kw and less than or equal to 8kw. Alternatively, the rated discharge power of the battery pack 100 is greater than or equal to 5kw and less than or equal to 8kw. In this embodiment, the maximum continuous discharge power of the battery pack is greater than or equal to 300kw and less than or equal to 8kw. Alternatively, the maximum continuous discharge power of the battery pack is greater than or equal to 3kw and less than or equal to 15kw. Alternatively, the maximum continuous discharge power of the battery pack is greater than or equal to 4kw and less than or equal to 10kw. Alternatively, the maximum continuous discharge power of the battery pack is greater than or equal to 2kw and less than or equal to 10kw. This makes the discharge efficiency of the battery pack placed in the outdoor wheeled equipment 100 higher. It should be noted that the continuous maximum discharge power is the discharge power when the outdoor wheeled equipment 200 is working normally, and the instantaneous abnormally large discharge power that occurs when the outdoor wheeled equipment 200 is blocked or cutting some stones does not include the continuous maximum discharge power mentioned in this embodiment.

[0034] refer to Figures 3 to 9The battery pack 100 shown includes at least a housing 11, a battery cell module 12, and a terminal assembly 13. Among them, the battery cell module 12 may include a plurality of battery cells 121 for storing electrical energy. In the present embodiment, the battery cell 121 may be a cylindrical battery, or a square battery, or an aluminum-plastic film battery, or a metal shell battery, or a soft-pack battery, etc. In one embodiment, the battery cell 121 may be a single-pole ear battery, or a bipolar ear battery, or a full-pole ear battery. In the present embodiment, at least some of the battery cells 121 are lithium iron phosphate batteries. Or the positive electrode material of at least some of the battery cells 121 is a sodium ion battery cell. Or the positive electrode material of at least some of the battery cells 121 is a capacitor battery. Or the positive electrode material of at least some of the battery cells 121 is a lithium ion battery cell, such as a ternary lithium battery cell. Or the positive electrode material of at least some of the battery cells 121 is a supercapacitor. Or the battery pack 100 contains a mixture of multiple batteries of different materials or properties. The terminal assembly 13 may include a discharge interface that can be connected to an electrical device, or include a charging interface that can be connected to a charging device, or include a charging and discharging interface that can be connected to both an electrical device and a charging device. This embodiment does not limit the type or position of the terminal assembly 13.

[0035] The battery pack 100 further includes a battery cell support 14 configured to support the battery cell 121. Figure 4 As shown, the battery holder 14 may be an integrated holder including a plurality of independent accommodating spaces 141 for accommodating a plurality of battery cells 121 respectively. Figure 5 As shown, the battery cell holder 14 may include two end caps 141, one end cap 141 is engaged with one end face of a group of battery cells 121, and the other end cap 141 is engaged with the other end face of the group of battery cells 121, and the battery cells 121 between the two end caps 141 are exposed outside the battery cell holder 14. In other words, the battery cell holder 14 at least supports the positive / negative poles of the battery cells 121. It is not limited to the structural form of the battery cell holder 14, and it can be understood that the end faces of the positive and / or negative poles of all the battery cells 121 in a battery cell module 12 form two battery cell module end faces of the battery cell module 12. In other embodiments, the battery cell module 12 may also include a battery cell holder 14. In one embodiment, as Figure 6 The battery cell 121 in the battery cell module 12 shown may be a square battery cell, and the accommodation cavity in the battery cell support 14 may be a square accommodation cavity.

[0036] In the present embodiment, the diameter of the battery cell 121 is greater than or equal to 3 cm, for example, the diameter of the battery cell 121 is 3 cm, 3.5 cm or 4 cm. In one embodiment, the diameter of the battery cell 121 is greater than or equal to 4 cm, for example, it can be 4.5 cm, 4.6 cm or 5 cm. In the present embodiment, the height of the battery cell 121 is greater than or equal to 8 cm, for example, the height of the battery cell 121 is 8 cm, 9 cm, 10 cm, 11 cm, 12 cm, 13 cm or 13.5 cm. The size of the battery cell 121 is large, and the battery cells are not fully enclosed. If some of the battery cells 121 have thermal runaway during the operation of the battery pack 100, it will affect the adjacent battery cells, so that the battery pack will explode or catch fire, which is a highly dangerous safety accident.

[0037] In order to avoid the above situation, at least the battery cells 121 in the battery pack 100 are immersed in the coolant 150, or at least part of the battery cells 121 are immersed in the coolant 150. The coolant can not only conduct heat during the normal operation of the battery pack 100, but also reduce the impact of thermal runaway when thermal runaway occurs in the battery cell 121, at least not affecting the adjacent battery cells or affecting a smaller number of battery cells.

[0038] In this embodiment, the coolant 150 may be cooling oil. In one embodiment, the viscosity of the cooling oil is relatively low, and the viscosity parameter of the cooling oil is less than or equal to 80 mm² / s, or less than or equal to 75 mm² / s, or less than or equal to 70 mm² / s, or less than or equal to 65 mm² / s, or less than or equal to 60 mm² / s, or less than or equal to 50 mm² / s, or less than or equal to 40 mm² / s, or less than or equal to 30 mm² / s, or less than or equal to 20 mm² / s in an environment at a temperature of substantially 40°C. In one embodiment, the viscosity parameter of the cooling oil is 40 mm² / s. In one embodiment, the viscosity parameter of the cooling oil is 25 mm² / s. It should be noted that the higher the ambient temperature, the lower the viscosity parameter of the cooling oil. For example, when the ambient temperature is 60°C, the viscosity parameter of the cooling oil is less than or equal to 60 mm² / s, or less than or equal to 50 mm² / s, or less than or equal to 40 mm² / s, or less than or equal to 30 mm² / s, or less than or equal to 20 mm² / s.

[0039] In this embodiment, the auto-ignition temperature of the cooling oil is relatively high. Exemplarily, the auto-ignition temperature of the cooling oil is greater than or equal to 400°C, or greater than or equal to 420°C, or greater than or equal to 430°C, or greater than or equal to 440°C, or greater than or equal to 450°C, or greater than or equal to 460°C, or greater than or equal to 470°C, or greater than or equal to 480°C, or greater than or equal to 490°C, or greater than or equal to 500°C. In one embodiment, the density of the cooling oil is greater than or equal to 0.5g / cm³ and less than or equal to 1g / cm³. For example, the density of the cooling oil can be 0.5g / cm³, or 0.6g / cm³, or 0.7g / cm³, or 0.8g / cm³, or 0.9g / cm³, or 1g / cm³. In one embodiment, the stability of the cooling oil to hot spots is greater than or equal to 500°C.

[0040] refer to Figures 7 and 8 , the housing 11 may include a lower housing 111, and the lower housing 111 may at least form a first accommodating chamber 101, which is at least used to accommodate the battery module 12. In this embodiment, after the upper housing 112 and the lower housing 111 are covered, the first accommodating chamber 101 may be a closed chamber, and a coolant 150, i.e., cooling oil, is arranged in the closed chamber. In one embodiment, the cooling oil may fill the first accommodating chamber 101, or the cooling oil may fill at least 30% of the first accommodating chamber 101, or the cooling oil may fill 40% of the first accommodating chamber 101, or the cooling oil may fill 50% of the first accommodating chamber 101, or the cooling oil may fill 60% of the first accommodating chamber 101, or the cooling oil may fill 70% of the first accommodating chamber 101, or the cooling oil may fill 80% of the first accommodating chamber 101, or the cooling oil may fill 90% of the first accommodating chamber 101. In this embodiment, the proportion of the cooling oil filling the first accommodating chamber 101 may be understood as the percentage of the remaining volume of the first accommodating chamber 101 that can be filled with cooling oil after the battery module 12 is installed. For example, the cooling oil can fill the first accommodating chamber 101, which can be understood as the remaining space of the first accommodating chamber 101 after the battery module 120 is installed is filled with cooling oil. In other embodiments, the proportion of cooling oil filling the first accommodating chamber 101 can also be understood as the percentage of cooling oil in the total volume of the first accommodating chamber 101.

[0041] In this embodiment, the coolant 150 has insulating properties, so that the connecting pieces 1211 between the battery cells 121 immersed therein will not short-circuit. In addition, even if the coolant 150 in the first receiving cavity 101 leaks to other parts of the battery pack 100, it will not cause a short circuit problem between different electronic components in the battery pack 100.

[0042] In one embodiment, a pump (not shown) may be further provided in the first accommodating chamber 101 to transport the coolant 150 from the bottom of the first accommodating chamber 101 to the bottom of the first accommodating chamber 101, so as to prevent the top battery cell 121 from being unable to conduct heat due to not being immersed in the coolant 150, or being uncontrollable when thermal runaway occurs, when the coolant 150 does not fill the first accommodating chamber 101. It is understandable that the pump may be installed at any position in the first accommodating chamber 101, and the coolant may be transmitted through a connecting pipe connected to the pump, and the coolant may be sprayed down to the battery cell module 12 at the bottom of the first accommodating chamber 101 through the transmission of the pump. In other embodiments, the pump may also be detachably mounted to the housing 11, and the connecting pipe may be provided in the first accommodating chamber 101, and the connecting pipe may be connected to an external pump through a connecting piece on the housing, wherein the connection between the connecting pipe and the housing is sealed to prevent the coolant in the first accommodating chamber 101 from leaking out. In this embodiment, a pump connected to the outside of the battery pack 100 can circulate the coolant up and down in the first accommodating chamber 101, or can circulate the coolant between the first accommodating chamber 101 and an external cooling device to enhance the effect of heat conduction of the coolant.

[0043] In one embodiment, the pump disposed in the first accommodating chamber 101 can be powered by the battery core module 12 .

[0044] In one embodiment, the lower shell 111 may also form a second accommodating chamber 102. A circuit assembly 140 is installed in the second accommodating chamber 102. A partition 103 is provided between the first accommodating chamber 101 and the second accommodating chamber 102 to separate the two accommodating chambers and at least form a closed first accommodating chamber 101. In this embodiment, the second accommodating chamber 102 may be a closed cavity or a non-closed cavity. In this embodiment, the ratio of the volume of the first accommodating chamber 101 to the volume of the second accommodating chamber 102 is greater than or equal to 2, or the ratio of the volume of the first accommodating chamber 101 to the volume of the second accommodating chamber 102 is greater than or equal to 2.5, or the ratio of the volume of the first accommodating chamber 101 to the volume of the second accommodating chamber 102 is greater than or equal to 3.

[0045] In order to enable the battery cell module 12 in the first accommodating chamber 101 to be electrically connected to the circuit assembly 140 in the second accommodating chamber 102, a mounting hole 1031 may be provided on the partition 103. The battery cell module 12 and the circuit assembly 140 may be connected via a connecting wire, which may include a power line or a communication line, etc. After the connecting wire is installed in the mounting hole 1031, it is sealed on at least one side of the first accommodating chamber 101, so that the coolant 150 in the first accommodating chamber 101 will not penetrate into the second accommodating chamber 102 through the mounting hole 1031 or the connecting wire. In other words, the connection between the connecting wire and the mounting hole 1031 has a sealing design. In one embodiment, a sealing gasket may be used to seal the gap between the connecting wire and the mounting hole 1031, or a sealing plug sealing gasket may be used to seal the gap between the connecting wire and the mounting hole 1031, or other sealing methods may be used, which are not limited here.

[0046] In some embodiments, directly immersing the battery cell module 12 in cooling oil requires consideration of the compatibility between the material on the battery cell surface that is in direct contact with the cooling oil and the cooling oil, and places high requirements on the cooling oil.

[0047] In order to avoid the above situation, the present application sets a cooling module 15 in the battery pack 100. Fig. 9 As shown, the cooling module 15 can be arranged adjacent to a module end face of the battery cell module 12. In the present embodiment, a cooling module 15 can be arranged adjacent to each of the two end faces of the battery cell module 12. In other embodiments, a plurality of cooling modules 15 can be arranged in the battery pack 100, and the sizes, shapes or materials of the plurality of cooling modules 15 can be the same or different. For example, some cooling modules 15 can be arranged adjacent to the end faces of the battery cell module 12 so that the battery cell module 12 can obtain a larger heat dissipation area, some cooling modules 15 can surround the sides of the battery cell module 12, or some battery cell modules 12 can be inserted in the remaining space in the shell 11. Among them, the side faces of the battery cell module 12 can be understood as the faces other than the two end faces of the battery cell module.

[0048] In this embodiment, the adjacent arrangement can be understood as the cooling module 15 being arranged on the module end face of the battery module 12, and at least being able to make thermal contact with the battery module 12. That is, the distance between the cooling module 15 and the battery module 12 can be greater than or equal to zero without affecting the thermal contact between the two.

[0049] In this embodiment, the cooling module 15 can be set independently of the battery cell module 12, that is, there is no connection relationship with the battery cell module 12, and the cooling module 15 can be taken out separately for replacement, which at least ensures the service life of the battery pack 100 in terms of heat dissipation. In one implementation, a flexible pull member 151 can be set on the cooling module 15 to facilitate the removal of the cooling module 15 from the battery pack 100. In addition, the cooling material in the cooling module 15 does not directly contact the battery cell module 12, which can prevent and solve the above-mentioned compatibility problem.

[0050] In this embodiment, the cooling module 15 can consume the heat generated by the battery cell module 12 through the special properties of its own substance or material, or it can transfer the heat generated by the battery cell module 12 to the shell 11 for heat dissipation, or part of the heat can be consumed by the battery cell module 12 itself, and part of the heat can be dissipated through the shell 11.

[0051] During the normal charging and discharging process of the battery pack 100, the battery cells 121 in the battery cell module 12 will generate heat, and the generated heat can be taken away or consumed by the cooling module 15, so as to quickly cool the battery pack 100. If a battery cell 121 in the battery cell module 12 thermally runs away, the high-temperature and high-pressure gas generated by the thermal runaway can be quickly transferred to the cooling module 15 and consumed by the cooling module 15.

[0052] In this embodiment, a cooling material may be sealed in the cooling module 15, for example, a liquid cooling material, a solid cooling material, or a semi-solid cooling material, or the cooling material may be a phase change material. In other words, the cooling module 15 may be a device as a whole with good heat dissipation or temperature reduction effect formed by sealing a cooling material with good cooling effect in a module shell. In other embodiments, the cooling module 15 may also be a material or substance as a whole. In this embodiment, the thermal conductivity of the cooling material is less than or equal to 0.15 W / mK, for example, it may be less than or equal to 0.12 W / mK, or less than or equal to 0.1 W / mK, etc.

[0053] In one embodiment, the cooling material may be cooling oil. The viscosity of the cooling oil is relatively low. In an environment where the temperature is substantially 40°C, the viscosity parameter of the cooling oil is less than or equal to 80 mm² / s, or less than or equal to 75 mm² / s, or less than or equal to 70 mm² / s, or less than or equal to 65 mm² / s, or less than or equal to 60 mm² / s, or less than or equal to 50 mm² / s, or less than or equal to 40 mm² / s, or less than or equal to 30 mm² / s, or less than or equal to 20 mm² / s. In one embodiment, the viscosity parameter of the cooling oil is 40 mm² / s. In one embodiment, the viscosity parameter of the cooling oil is 25 mm² / s. It should be noted that the higher the ambient temperature, the lower the viscosity parameter of the cooling oil. For example, when the ambient temperature is 60°C, the viscosity parameter of the cooling oil is less than or equal to 60 mm² / s, or less than or equal to 50 mm² / s, or less than or equal to 40 mm² / s, or less than or equal to 30 mm² / s, or less than or equal to 20 mm² / s. The auto-ignition temperature of the cooling oil is greater than or equal to 400°C, or greater than or equal to 420°C, or greater than or equal to 430°C, or greater than or equal to 440°C, or greater than or equal to 450°C, or greater than or equal to 460°C, or greater than or equal to 470°C, or greater than or equal to 480°C, or greater than or equal to 490°C, or greater than or equal to 500°C. In one embodiment, the density of the cooling oil is greater than or equal to 0.5g / cm³ and less than or equal to 1g / cm³. For example, the density of the cooling oil can be 0.5g / cm³, or 0.6g / cm³, or 0.7g / cm³ or 0.8g / cm³ or 0.9g / cm³, or 1g / cm³. In one embodiment, the stability of the cooling oil to hot spots is greater than or equal to 500°C. The cooling module 15 with sealed cooling oil is light in weight and does not increase the weight of the battery pack 100 itself much, and the auto-ignition temperature of the cooling oil is high, which avoids the cooling module 15 from self-igniting due to the impact of heat after the thermal runaway of the battery cell 121.

[0054] In one embodiment, the cooling module 15 can be taken out of the battery pack 100 as a separate component or independently installed in the housing 11. In other words, the cooling module 15 is an independent heat dissipation or temperature reduction component that can be replaced or replaced, thereby always ensuring the heat dissipation or temperature reduction effect of the cooling module 15 in the battery pack 100.

[0055] In one embodiment, Fig.10The shell 11 shown can form a storage cavity 104 for storing cooling material, and a first accommodating cavity 101 for accommodating the battery cell module 12. A cavity valve 105 is provided at any one or more positions on the cavity wall between the storage cavity 104 and the first accommodating cavity 101, facing the cooling module 15, so that after the cooling module 15 is installed in the battery pack 100, the cooling liquid can be replenished from the storage cavity 104 to the cooling module 15. It should be noted that a module valve is also correspondingly provided on the cooling module 15 to correspond to the cavity valve. In this embodiment, the cavity valve 105 and the module valve only allow the cooling liquid to flow from the accommodating cavity 112 into the cooling module 15, and do not allow the cooling liquid to flow in the opposite direction. The number and type of cavity valves and module valves are not limited here. In some implementations, a sensing element may be provided on the cavity valve and / or the module valve. After sensing that the corresponding cavity valve or module valve is installed in place, the sensing element may trigger a group of cavity valves and module valves to be unidirectionally connected to allow the coolant to flow into the cooling module 15. In this embodiment, the storage cavity 104 may be a closed cavity, and the coolant in the storage cavity 104 may be replaced or supplemented through a through hole (not shown) provided on the cavity wall.

[0056] In this embodiment, reference Figures 4 to 6 Each cell accommodating cavity 141 shown accommodates a cell 121, and adjacent cells 121 are not in direct contact with each other, but are separated by the cavity wall of the cell accommodating cavity 141. Therefore, when each cell 121 has a slight thermal runaway in its respective cell accommodating cavity 141, it will not affect the adjacent cell 121. The so-called slight thermal runaway means that the degree of thermal runaway of the cell 121 can be blocked by the cavity wall of the cell accommodating cavity 141, and will not break through the cavity wall and spread to the adjacent cell accommodating cavity 141. In this embodiment, the thermal deformation temperature of the cell holder 14 is greater than or equal to 500°C. Alternatively, the thermal deformation temperature of the cell holder 14 is greater than or equal to 550°C. Alternatively, the thermal deformation temperature of the cell holder 14 is greater than or equal to 600°C. Alternatively, the thermal deformation temperature of the cell holder 14 is greater than or equal to 650°C. Illustratively, if the thermal runaway temperature of the battery cell 121 is less than 500°C, the cavity wall of the battery cell accommodating cavity 141 will not be thermally deformed, thereby avoiding thermal runaway of one battery cell 121 causing damage to multiple battery cells 121 in the battery pack 100, thereby reducing the hazard of thermal runaway of the battery pack 100.

[0057] In this embodiment, the density of the cell support 14 is greater than or equal to 1g / cm³. Of course, it is understandable that the density of the cell support 14 can be greater than or equal to 1g / cm³ and less than or equal to 5g / cm³, or the density of the cell support 14 can be greater than or equal to 1.5g / cm³ and less than or equal to 2g / cm³, or the density of the cell support 14 can be greater than or equal to 1.5g / cm³ and less than or equal to 4g / cm³.

[0058] In this embodiment, the battery support 14 is formed of a flame-retardant thermoplastic material that inhibits the spread of thermal runaway, and the material may include at least polyamide, lubricant, antioxidant, surfactant, toughening agent, non-toxic flame retardant, reinforcing material and reinforcing modifier. Among them, the polyamide is nylon 6, nylon 66 or a combination thereof, and the weight percentage of polyamide may be 20%-50%. The weight percentage of the lubricant may be 0.1%-3%. The weight percentage of the toughening agent may be 0.1%-30%. The five-toxic flame retardant may include at least polyphosphate metal salts, melamine phosphates, melamine cyanurate, phosphates, borates or mixtures thereof, and the weight percentage thereof may be 3%-50%. The reinforcing modifier may be a metal oxide and its derivatives, a metal hydroxide and its derivatives or a metal silicate, and the weight percentage of the reinforcing modifier is 8%-40%. The reinforcing material may be glass fiber, mineral fiber or kaolin, and the weight percentage of the reinforcing material is 0 to 25%.

[0059] In this embodiment, the thermal conductivity coefficient of the battery holder 14 may vary with the temperature. For example, at the first temperature, the thermal conductivity coefficient of the battery holder 14 is greater than or equal to 0.5 W / mK, and at the second temperature, the thermal conductivity coefficient of the battery holder 14 is less than or equal to 0.05 W / mK. The first temperature may be a temperature range, such as 0°C-500°C, and the second temperature may also be a temperature range, such as greater than 500°C. In other words, when the temperature is low, the battery holder 14 has a good heat dissipation effect, which can enable the normal charging and discharging of the battery pack 200; and when the battery cell 230 in the battery pack 200 at a higher temperature has a thermal runaway or is about to have a thermal runaway, the battery holder 14 has a high effect of preventing heat conduction, preventing the battery cell 230 from being affected by its adjacent thermal runaway battery cell 230. In other embodiments, the thermal conductivity coefficient of the cell holder 14 at the first temperature and / or the second temperature can be adjusted by modifying the constituent material of the cell holder 14, for example, the thermal conductivity coefficient of the cell holder 14 at the first temperature is greater than or equal to 0.5 W / mK, and the thermal conductivity coefficient of the cell holder 14 at the second temperature is less than or equal to 0.03 W / mK. Alternatively, the thermal conductivity coefficient of the cell holder 14 at the first temperature is greater than or equal to 0.7 W / mK, and the thermal conductivity coefficient of the cell holder 14 at the second temperature is less than or equal to 0.02 W / mK. Alternatively, the thermal conductivity coefficient of the cell holder 14 at the first temperature is greater than or equal to 0.8 W / mK, and the thermal conductivity coefficient of the cell holder 14 at the second temperature is less than or equal to 0.015 W / mK.

[0060] The shell 11 of the battery pack 100 is strong or thick or wrapped with a rubber layer to prevent the battery pack 100 from being broken when it falls. If the positive and negative electrodes of the battery cells 121 in the battery cell module 12 in the battery pack 100 face the shell 11, since the first end cover 122 and the second end cover 123 are semi-enclosed end covers, after the battery cell 121 has thermal runaway, it is easy to conduct heat to the shell 11 corresponding to the positive or negative electrode of the battery cell 121, or conduct heat to the adjacent battery cell 121 through the semi-enclosed end cover.

[0061] In order to avoid this situation, the battery pack 100 further includes an exhaust housing 160. Fig.11 As shown, the exhaust housing 160 is disposed on two end surfaces of the battery cell module 12, that is, the exhaust housing 160 is disposed on the end surface formed by the battery cell holder 14 and the positive electrode arrangement of the battery cell 121, and the exhaust housing 160 is also disposed on the end surface formed by the battery cell holder 14 and the negative electrode arrangement of the battery cell 121. In other words, two exhaust housings 160 can be disposed in the battery pack 100 having one battery cell module 12.

[0062] like Fig.12 , the first cell support 14a supports the first cell 121a, and the second cell support 14b supports the second cell 121b. The first cell 121a and the first cell support 14a constitute the first cell module 12a, and the second cell 121b and the second cell support 14b constitute the second cell module 12b. The positive electrode of the first cell 121a corresponds to the positive electrode of the second cell 121b, or the negative electrode of the first cell 121a corresponds to the positive electrode of the second cell 121b, or the negative electrode of the first cell 121a corresponds to the negative electrode of the second cell 121b, or the positive electrode of the first cell 121a corresponds to the negative electrode of the second cell 121b, or the positive electrode of the first cell 121a corresponds to the negative electrode of the second cell 121b. There is a certain distance between the corresponding first cell 121a and the second cell 121b. The exhaust housing 160 can be arranged between the interval. That is, the exhaust housing 160 is arranged between the first cell module 12a and the second cell module 12b. In this embodiment, the other end face of the first battery module 12a away from the second battery module 12b is also adjacent to the exhaust housing 160, and the other end face of the second battery module 12b away from the first battery module 12a is also adjacent to the exhaust housing 160. That is, three exhaust housings 160 can be provided in the battery pack 100 including two battery modules 12.

[0063] In one embodiment, the number of exhaust housings 160 in the battery pack 100 is greater than the number of battery cell modules 12. For example, the number of exhaust housings 160 is one more than the number of battery cell modules 12.

[0064] In this embodiment, the material properties, density, thermal conductivity, thermal deformation temperature, etc. of the exhaust housing 160 are consistent with or substantially the same as those of the battery cell holder 14 , and are not described in detail herein.

[0065] like Figures 11 to 13 As shown, the exhaust housing 160 forms at least one exhaust passage 161. Fig.13 The figure shows the internal structure of the exhaust housing 160 directly after removing an end face with an air inlet 1611. The extension direction of the exhaust channel 161 is substantially perpendicular to the extension direction of the battery cell 121. The exhaust channel 161 may be a curved channel, and the curved shape may be consistent with the curved shape of the cross section formed after the battery cell 121 is arranged in the battery cell holder 14, so as to make the structure of the battery pack 100 more compact. In one embodiment, a baffle 164 is provided between adjacent exhaust channels 161.

[0066] like Fig.12 The exhaust channel 161 includes an air inlet 1611 and an air outlet 1612. The air inlet 1611 corresponds to the positive or negative pole of the battery cell 121, and the air outlet 1612 may correspond to a window (not shown) on the housing 11. In this embodiment, an air inlet 1611 is provided on an end surface of the exhaust housing 160 adjacent to the battery cell holder 14, and each positive or negative pole of each battery cell 121 corresponds to an air inlet 1611. The number of air inlets 1611 on each exhaust housing 160 is the same as the number of battery cells 121. Fig.11 and Fig.12 Only one air inlet 1611 is shown, and the other air inlets 1611 are not shown. The air outlet 1612 can be arranged on any one or more of the four peripheries of the exhaust housing 160, and the air outlet 1612 can be closed or semi-closed. Fig.11 and Fig.12 The air outlet 1612 shown in the figure is correspondingly arranged at one end or both ends of each exhaust channel 161 .

[0067] When a battery cell 121 generates a large amount of hot gas due to thermal runaway, the hot gas can enter the exhaust channel 161 through the air inlet 1611, thereby preventing the battery cell 121 in thermal runaway from penetrating the battery cell accommodating cavity 141 and damaging the battery cell 121 therein. It is understandable that the hot gas can gradually cool down in the exhaust channel 161, or be discharged outside the battery pack 100 through the air outlet 1612.

[0068] In one embodiment, the air inlet 1611 is in a closed state at a first temperature, and is opened at a second temperature, wherein the second temperature is greater than the first temperature.

[0069] In one embodiment, the air inlet 1611 of the exhaust channel 161 can be integrally formed with the exhaust housing 160, that is, the air inlet 1611 does not have a substantial opening or gap that allows other objects to enter the exhaust channel 161. In this embodiment, the thickness of the housing at the air inlet 1611 is less than the thickness at other locations of the exhaust housing 160, for example, it can be 0.25 times, 0.5 times, or 0.3 times the thickness of the housing at other locations. Therefore, when the battery cell 121 has thermal runaway, a large amount of hot gas can break through the weak housing at the air inlet 1611 and enter the exhaust channel 161.

[0070] In one embodiment, Fig.14 The air inlet 1611 of the exhaust passage 161 shown may include a stopper 162, which has a stop state and an open state. When the impact strength is less than a set value, the stopper 162 is in the stop state, and when the impact strength is greater than the set value, the stopper 162 is in the open state. In one embodiment, the stopper 162 may be an exhaust valve, which is closed when the impact strength is less than the set value, and is opened when the impact strength is greater than the set value. In one embodiment, as Fig.11 The stopper 162 shown may be a stopper housing formed by the exhaust housing 160, and a plurality of through holes 163 are provided around the stopper 162. Due to the presence of the through holes 163, the strength of the exhaust housing 160 between adjacent through holes 163 is reduced. When the battery cell 121 has thermal runaway, the exhaust housing 160 between adjacent through holes 163 is easily broken. In some embodiments, the air inlet 1611 may also be a through hole of any shape, such as a round hole.

[0071] In one embodiment, the outdoor wheeled equipment 200 can be installed with at least two battery packs 100, for example, including a first battery pack and a second battery pack for powering the walking motor. Among them, the first battery pack includes a plurality of third battery cells and a third battery cell bracket supporting the third battery cells, and the second battery pack includes a fourth battery cell and a fourth battery cell bracket supporting the fourth battery cell. In this embodiment, the material properties or density or thermal conductivity or thermal deformation temperature of the third battery cell bracket and the fourth battery cell bracket at the same temperature may be the same or different. For example, the thermal conductivity of the third battery cell bracket and / or the fourth battery cell bracket is less than or equal to 0.05W / mK at the second temperature. In this embodiment, the nominal voltage, output power or maximum continuous output power or battery cell material of the two battery packs are not specifically limited. In this embodiment, the first battery pack can be installed in the same battery pack installation part as the second battery pack, or they can be installed in different battery pack installation parts respectively. Or the first battery pack is fixed in the tool body and cannot be disassembled, and the second battery pack is detachably installed in the battery pack installation part. Or the second battery pack is fixed in the tool body and cannot be disassembled, and the first battery pack is detachably installed in the battery pack installation part.

[0072] In the present application, the coolant 150 may also be referred to as cooling oil 150. If the coolant 150 also includes cooling substances of other substances, it may also be indicated by the reference numeral 150, which is not limited here.

[0073] In one embodiment, the battery cell 121 can be immersed in the coolant 150, while the battery cell holder 14 and the exhaust shell 160 are not immersed in the coolant. Or at least the positive and negative end surfaces of the battery cell 121 are not in contact with the coolant 150. In one implementation, the battery cell holder 14 can at least be sealed and supported on the positive and negative end surfaces of the battery cell 121, so that when the battery cell module 12 is prevented from being in the first accommodating chamber 101 provided with the coolant 150, the positive and negative end surfaces of the battery cell 121 are not in contact with the coolant 150, thereby solving the problem of component failure caused by cooling oil. Among them, a sealant, such as a sealant or a sealing pad or a sealing sponge or a sealing tape, etc., can be provided at the support between the battery cell holder 14 and the positive and negative end surfaces of the battery cell 121 to at least ensure that the positive and negative end surfaces of the battery cell 121 do not contact the cooling oil 150.

[0074] It is understandable that when the battery pack 100 does not experience thermal runaway, especially when the battery pack 100 is working in a low temperature environment, it may be affected by the temperature and cannot work normally, and the discharge capacity is limited. In this embodiment, the cooling oil 150 in the battery pack 100 can be used to heat the battery cell module 12, at least to ensure that the temperature environment of the battery pack 100 is basically maintained at a normal temperature environment. The so-called normal temperature can be understood as a temperature of about 15°C, or a temperature of about 20°C, or a temperature of about 25°C, etc.

[0075] In one embodiment, a heating device 170 may be provided in the housing 11 to heat at least the cooling oil 150 in the battery pack 100. In this embodiment, the heating device 170 may heat the cooling liquid 150 at least when the temperature in the battery pack 100 reaches a first temperature threshold. In one implementation, the heating device 170 itself may include a temperature sensor (not shown) capable of detecting temperature. When the temperature sensor detects that the temperature in the battery pack 100 is lower than the temperature threshold, the heating device 170 triggers the heating function. Alternatively, Fig.15As shown, at least one detection device 171 can be provided in the battery pack 100, which can at least detect the temperature of the battery cell module 12, which may include the surface temperature or the internal temperature of the battery cell module 12. When the detected temperature exceeds the temperature threshold, the controller 172 in the battery pack 100 can control the heating device 170 to start working to heat the coolant, and can control the heating device 170 to stop working when the detection device 171 detects that the temperature of the coolant reaches the room temperature. In this embodiment, the detection device 171 can be provided on the battery cell module 12, and the controller 172 can be provided on the circuit board in the battery pack 100.

[0076] In this embodiment, the heating device 170 may be disposed in the first accommodating chamber 101 to directly heat the cooling oil 150 in the first accommodating chamber 101 , and may be disposed, for example, at the bottom of the first accommodating chamber 101 .

[0077] In one embodiment, Fig.16 As shown, the heating device 170 can be arranged in the second accommodating chamber 102, and the cooling oil 150 is arranged in the second accommodating chamber 102. The first accommodating chamber 101 and the second accommodating chamber 102 are at least partially connected. When heating is required, the heating device 170 can first heat the cooling oil in the second accommodating chamber 102, and the heated cooling oil flows into the first accommodating chamber 101 through the connection relationship between the first accommodating chamber 101 and the second accommodating chamber 102, and realizes the cold and hot cycle by means of the convection of the liquid, so as to heat the cooling oil 150 in the first accommodating chamber 101, thereby heating the battery module 12. In this embodiment, at least one connecting hole 106 is provided on the cavity wall between the two accommodating cavities to connect the cooling oil in the cavity. The connecting hole 106 can be set at the lower end of the cavity wall between the two accommodating cavities, which can prevent the circulation of hot and cold oils from being affected by the amount of cooling oil, and can also better perform hot and cold circulation, so that the hot cooling oil 150 can flow to the bottom of the first accommodating cavity 101, and rise from the bottom to the upper part of the first accommodating cavity 101, so that the entire battery cell module 12 is heated evenly.

[0078] In some embodiments, the heating device 170 may be a resistance wire, a heating film, a heating rod, or the like.

[0079] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An outdoor wheeled tool comprising: Tool body; A walking wheel set, configured to support the tool body; A walking motor, configured to drive the walking wheel set to walk; A battery pack mounting portion, disposed on the tool body, for mounting at least one battery pack; The battery pack comprises: case; At least one battery cell module, including a plurality of battery cells, is disposed in the housing; At least a portion of the battery cell is immersed in a coolant; The battery pack further comprises: A heating device is arranged in the shell to heat the coolant.

2. The outdoor wheeled tool according to claim 1, characterized in that: The battery cell module further comprises a battery cell support; the battery cell support is configured to support the battery cell; wherein the battery cell support at least seals and supports the positive terminal surface and the negative terminal surface of the battery cell.

3. The outdoor wheeled tool according to claim 1, characterized in that: The heating device heats the coolant when the temperature is lower than a temperature threshold.

4. The outdoor wheeled tool according to claim 1, characterized in that: The battery pack also includes at least one detection device, which is configured to at least detect the temperature of the battery cell module; and a controller, which is configured to control the heating device to start heating the coolant when the temperature of the battery cell module is less than a temperature threshold.

5. The outdoor wheeled tool according to claim 1, characterized in that: The heating device at least comprises a resistance wire or a heating film or a heating rod.

6. The outdoor wheeled tool according to claim 1, characterized in that: The heating device is at least partially immersed in the cooling liquid.

7. A battery pack suitable for outdoor electric equipment, comprising: case; A battery cell module, comprising a plurality of battery cells, is disposed in the housing; The housing at least forms: A first accommodating cavity for accommodating the battery cell module; The second accommodating chamber is used to store at least cooling liquid; The battery pack further comprises: A heating device, disposed in the second accommodating chamber to heat the coolant; The first accommodating cavity and the second accommodating cavity are at least partially communicated with each other.

8. The battery pack according to claim 7, characterized in that: The positive terminal surfaces and the negative terminal surfaces of the plurality of battery cells at least do not contact the coolant.

9. The battery pack according to claim 7, characterized in that: The battery cell module further comprises a battery cell support; the battery cell support is configured to support the battery cell; wherein the battery cell support at least seals and supports the positive terminal surface and the negative terminal surface of the battery cell.

10. The battery pack according to claim 7, characterized in that: The heating device heats the coolant when the temperature is lower than a temperature threshold.

11. The battery pack according to claim 7, characterized in that: The first accommodating cavity and the second accommodating cavity are arranged adjacent to each other, and at least one connecting hole is provided on the cavity wall between the first accommodating cavity and the second accommodating cavity to connect the first accommodating cavity and the second accommodating cavity.

Images