Battery pack and electric device

Abstract

The utility model relates to battery technology field provides a kind of battery pack and electrical equipment.The battery pack includes the box body with accommodating space inside, including the multiple batteries of the battery group being arranged in accommodating space along its thickness direction, first flexible circuit board and second flexible circuit board and a pair of temperature control module independent of each other.The first flexible circuit board is equipped with the multiple first temperature sensors corresponding with multiple batteries respectively.The second flexible circuit board is equipped with the multiple second temperature sensors corresponding with multiple batteries respectively, and the first temperature sensor and the second temperature sensor corresponding with same battery are used to sense the temperature of battery.A pair of temperature control module includes the first temperature control module and the second temperature control module independent of each other, and first temperature control module and second temperature control module are electrically connected with first flexible circuit board and second flexible circuit board respectively, and the battery pack thus configured has improved thermal safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and an electrical device including the battery pack. Background Technology

[0002] Battery packs are common energy storage devices, consisting of a housing and batteries housed within it. During operation, the batteries generate heat and expand. To ensure the thermal safety of the battery pack, a pair of temperature sensors is used to monitor the temperature of each battery. When multiple batteries are present in the pack, multiple pairs of temperature sensors are used to monitor the temperature of all batteries.

[0003] However, in traditional battery packs, multiple pairs of temperature sensors are electrically connected to the same flexible circuit board. Upon impact, one or more temperature sensors may detach from their corresponding batteries. When resetting the flexible circuit board and temperature sensors, it's necessary to ensure electrical connection between the other temperature sensors and their corresponding batteries while aligning the detached sensors with their corresponding batteries. This makes the reset operation difficult. Furthermore, if only one of a pair of temperature sensors fails, the flexible circuit board and all temperature sensors electrically connected to it must be replaced simultaneously. This not only makes replacement difficult but also negates the safety design of a pair of temperature sensors sensing the temperature of only one battery, unnecessarily increasing the cost of the battery pack. Utility Model Content

[0004] In view of this, the present invention provides a battery pack. The battery pack includes a housing with an internal receiving space, a battery pack comprising a plurality of batteries arranged along its thickness direction within the receiving space, a first flexible circuit board and a second flexible circuit board that are independent of each other, and a pair of temperature control modules. The first flexible circuit board has a plurality of first temperature sensors corresponding to each of the plurality of batteries. The second flexible circuit board has a plurality of second temperature sensors corresponding to each of the plurality of batteries, and the first and second temperature sensors corresponding to the same battery are used to sense the battery temperature. The pair of temperature control modules includes a first temperature control module and a second temperature control module that are independent of each other, and the first and second temperature control modules are electrically connected to the first and second flexible circuit boards, respectively.

[0005] The battery pack configured in this way includes a first flexible circuit board and a second flexible circuit board that are independent of each other. The first temperature sensors in a pair of temperature sensors sensing the same battery are both electrically connected to the first flexible circuit board, and the second temperature sensors in the pair are both electrically connected to the second flexible circuit board. In the event of a reset operation due to impact, only the first flexible circuit board and the multiple first temperature sensors electrically connected to it can be aligned, or only the second flexible circuit board and the multiple second temperature sensors electrically connected to it can be aligned. Similarly, in the event of a replacement operation due to temperature sensor damage, only the first flexible circuit board and the multiple first temperature sensors electrically connected to it can be replaced, or only the second flexible circuit board and the multiple second temperature sensors electrically connected to it can be replaced. This simplifies the reset and replacement operations of the battery pack.

[0006] Furthermore, when one of the first and second flexible circuit boards suffers from issues such as temperature sensor detachment, damage, or signal interference that makes it difficult to continue transmitting information, the other of the first and second flexible circuit boards can continue to operate, thereby ensuring a safe design that allows a pair of temperature sensors to sense the same battery temperature. This enables continuous and reliable thermal sensing and thermal management of the battery pack, ensuring its safety.

[0007] Another aspect of this utility model provides an electrical device having the aforementioned battery pack. Because it has the aforementioned battery pack, this electrical device possesses all the technical effects of the aforementioned battery pack, which will not be elaborated upon here. Attached Figure Description

[0008] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is an exploded view of the battery pack disclosed in this utility model.

[0012] Figure 2 for Figure 1 A schematic diagram of the structure of the battery in the battery pack.

[0013] Figure 3 for Figure 1 This is a structural diagram of the battery pack from another perspective; some components have been omitted for ease of understanding.

[0014] Figure 4This is a schematic diagram of a flexible circuit board.

[0015] Figure 5 This is a schematic diagram of an assembly method of a flexible circuit board and multiple batteries, in which the exhaust valve covered by the flexible circuit board is shown in dashed lines.

[0016] Figure 6 This is a schematic diagram of an assembly method of a flexible circuit board and multiple batteries, in which another flexible circuit board covered by the flexible circuit board is shown in dashed lines.

[0017] Figure 7 This is a schematic diagram of another assembly method for flexible circuit boards and multiple batteries.

[0018] Figure 8 This is a schematic diagram of another assembly method for flexible circuit boards and multiple batteries.

[0019] Figure 9 This is a cross-sectional view of the battery pack along its width.

[0020] Figure 10 This is a schematic diagram of the structure of an electrical device disclosed in this utility model. Detailed Implementation

[0021] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0022] This utility model embodiment provides a battery pack 100. The battery pack 100 typically includes a battery group consisting of multiple batteries 102 connected in parallel or series, a battery management system (BMS), an electrical connection system, a thermal management system, a support mechanism, and protective components. The support mechanism includes a housing 101, a bracket, a cover plate 1014, etc. The battery group, battery management system (BMS), electrical connection system, and thermal management system are arranged within a receiving space formed by the housing 101, protective components (not shown), and cover plate 1014, and are sealed by a protective mechanism such as a sealant to form a complete functional unit capable of directly outputting electrical energy.

[0023] refer to Figure 1 The battery pack 100 includes a housing 101, multiple batteries 102, multiple pairs of temperature sensors 103, a pair of temperature control modules 104, and a first flexible circuit board 108 and a second flexible circuit board 109 that are independent of each other.

[0024] In this invention, the housing 101 refers to a closed or semi-closed structure made of materials such as metal and plastic, which serves as the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The housing 101 can be cast from materials such as steel plates and aluminum alloys, or it can be made from lightweight materials, such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0025] Battery 102 is an energy storage unit capable of repeated charging and discharging, and can be interpreted as a "secondary battery." In this application, the concept of "secondary battery" can include, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, lead-acid batteries, and nickel-metal hydride batteries. Battery 102 can be, for example, a prismatic battery, which can be understood as a battery with a square prism shape. Battery 102 can also be a battery with other cross-sectional shapes along its height. The battery pack 100 described in this utility model will be described in detail below using a prismatic battery as an example.

[0026] For ease of understanding, in the accompanying drawings, the X-axis represents the width direction of the battery pack 100, which is also the width direction of the first flexible circuit board 108 and the second flexible circuit board 109. The Y-axis represents the thickness direction of the battery pack 100, which is also the thickness direction of the first flexible circuit board 108 and the second flexible circuit board 109. The Z-axis represents the height direction of the battery pack 100, which is also the height direction of the first flexible circuit board 108 and the second flexible circuit board 109. The positive direction of the Z-axis indicates the direction from the bottom surface of the battery pack 100 to its top surface, which is also the direction from the bottom surface of the battery 102 to its top surface. The terms "top" or "bottom" used in any element of this disclosure can be used with reference to this.

[0027] refer to Figure 1 The housing 101 includes a pair of long sidewalls 1011 disposed opposite each other along the thickness direction, a pair of short sidewalls 1012 disposed opposite each other along the width direction of the battery 102, a bottom wall 1013, and a cover 1014. The housing 101, the cover 1014, and a protective mechanism (not shown), such as a seal, together form a receiving space. Multiple batteries 102 can be arranged in the receiving space formed by the long sidewalls 1011, the short sidewalls 1012, the bottom wall 1013, and the cover 1014, and the long sidewalls 1011 of the housing 11 can face the first wall portion 102a of the battery 102. The bottom surfaces of the multiple batteries 102 can be fixed to the bottom wall 1013 using adhesives, fasteners, or the like. Subsequently, components such as strapping can be applied to the multiple batteries 102 to form a battery pack with relatively defined dimensions in the width and thickness directions.

[0028] In this invention, the term "battery pack" refers to a row of batteries 102 arranged along the thickness direction. The battery pack 100 may include one battery pack or multiple battery packs, and the number of batteries 102 in each battery pack can be determined according to the required capacity or voltage of the battery pack 100. This invention does not specifically limit the number of battery packs or the number of batteries 102 contained in a battery pack. The following will further illustrate the battery pack 100 described in this application using three battery packs as an example.

[0029] refer to Figure 2 Each battery 102 includes a first terminal 1022, an vent valve 107, and a second terminal 1023 with opposite polarity to the first terminal 1022, arranged sequentially along its width. Preferably, the first terminal 1022, the vent valve 107, and the second terminal 1023 are all located on the surface of the battery 102 facing away from the bottom wall 1013. That is, the first terminal 1022, the vent valve 107, and the second terminal 1023 are all disposed on the top surface of the battery 102. In this case, components such as conductive busbars can be arranged on the top side of the battery 102 to connect the first terminal 1022 and the second terminal 1023 of adjacent batteries 102, thereby realizing the series or parallel connection of multiple batteries 102.

[0030] refer to Figure 3 To ensure the thermal safety of the battery pack 100, temperature sensors 103 electrically connected to the flexible circuit board are typically used to sense the temperature of each battery. Each battery 102 is provided with a pair of temperature sensors 103, including a first temperature sensor 1031 and a second temperature sensor 1032.

[0031] The temperature sensor 103 collects the temperature of the battery cell in the battery 102 and sends the collected temperature information to the battery thermal management system (BMS) for temperature sampling. The temperature sensor 103 can be a thermistor. Based on its temperature coefficient, the temperature sensor 103 can be classified as a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC). These two types of thermistors represent different temperatures with different resistance values. A PTC thermistor has a higher resistance value at higher temperatures, while an NTC thermistor has a lower resistance value at higher temperatures.

[0032] The temperature sensor 103 can be formed from a material such as a semiconductor ceramic made of oxides of two or more metals selected from manganese, copper, silicon, cobalt, iron, nickel, zinc, etc. Alternatively, the temperature sensor 103 can be formed from non-oxide materials such as silicon carbide, tin selenide, tantalum nitride, etc. The temperature sensor 103 can be a droplet-type NTC or a surface-mount NTC temperature sensor. A droplet-type NTC temperature sensor includes a droplet-shaped sensor head and wires connected to the sensor head. A surface-mount NTC temperature sensor includes a generally cuboid-shaped head and wires connected to the head; the head of the surface-mount NTC temperature sensor can directly contact a thermal pad (not shown) or through a film structure that has minimal impact on temperature transfer.

[0033] In one possible implementation, the first temperature sensor 1031 and the second temperature sensor 1032 are arranged on opposite sides of the same battery 102 along its width, and are respectively adjacent to the first terminal 1022 and the second terminal 1023 of the battery 102. (See reference) Figure 4 In another possible implementation, the first temperature sensor 1031 and the second temperature sensor can be arranged on one side of the same battery 102 along the width direction, and adjacent to the first terminal 1022 or the second terminal 1023 of the battery 102. This invention does not limit the arrangement of the temperature sensor 103, as long as it can achieve direct or indirect sensing of the temperature of the corresponding battery 102.

[0034] Continue to refer to Figure 3 The flexible circuit board includes a first flexible circuit board 108 and a second flexible circuit board 109, which are independent of each other. In this invention, a flexible circuit board refers to a printed circuit board made of a flexible insulating substrate (such as polyimide or polyester film). It has highly flexible, foldable, and tortuous characteristics, and can adapt to complex three-dimensional spatial layouts that cannot be achieved by ordinary rigid circuit boards. To ensure the reliable operation of the battery, the battery samples information such as the voltage and temperature of each battery cell. Because the flexible circuit board (usually abbreviated as FPC) is flexible and small in size, it can save a certain amount of internal space for the assembled batteries.

[0035] Taking a first flexible circuit board 108 as an example, the first flexible circuit board 108 includes a first main body portion 1081 extending along the thickness direction across a plurality of batteries 102 and a plurality of first temperature measuring portions 1082 extending from the first main body portion 1081. The first main body portion 1081 serves to carry most of the transmission lines and provide sufficient strength for the first flexible circuit board 108. The first temperature measuring portions 1082 serve to be electrically connected to a plurality of first temperature sensors 1031 via contacts, such as those disposed on the surface of the first temperature measuring portions 1082. (Reference) Figure 3In one possible implementation, the first temperature measuring part 1082 can be aligned with the first main body part 1081 along the width direction to form a first flexible circuit board 108 with a smaller width dimension. (See reference) Figure 5 In another possible implementation, the first temperature measuring portion 1082 may also extend beyond the first main body portion in the width direction. Preferably, at least a first cutout portion 108a extending in the width direction and a second cutout portion 108b extending in the thickness direction exist between the first temperature measuring portion 1082 and the first main body portion 1081. The first cutout portion 108a and the second cutout portion 108b allow the first temperature measuring portion 1082 to be slightly offset relative to the first main body portion 1081 in the width and thickness directions, so as to facilitate the positioning and installation of the first flexible circuit board 108 while reducing the manufacturing precision requirements of the flexible circuit board, especially the alignment and installation of the first temperature sensor 1031 electrically connected to the plurality of first temperature measuring portions 1082 with the corresponding plurality of batteries 102. Depending on actual needs, more than two cutout portions may also be provided between the first main body portion 1081 and the first temperature measuring portion 1082, which will not be elaborated here.

[0036] Based on the same or similar principles, the second flexible circuit board 109 can have a structure similar to that of the first flexible circuit board 108. The second flexible circuit board 109 may include a second main body 1091 and a plurality of second temperature measuring parts 1092. A plurality of second temperature sensors 1032 are electrically connected to the plurality of second temperature measuring parts 1092 respectively. A third cutout portion 109a and a fourth cutout portion 109b may be provided between the second main body 1091 and the second temperature measuring parts 1092 to facilitate the alignment and installation of the plurality of second temperature sensors 1032 electrically connected to the plurality of second temperature measuring parts 1092 with the corresponding plurality of batteries 102.

[0037] Multiple first temperature measuring units 1082 can be arranged at intervals. (Reference) Figure 3 In one possible implementation, a plurality of first temperature measuring units 1082 are arranged sequentially along the thickness direction and on both sides along the width direction. (See reference) Figure 4 In one possible implementation, a plurality of first temperature measuring units 1082 are arranged at intervals along the thickness direction and on the same side along the width direction. In this invention, the term "interval arrangement" means that in a projection plane perpendicular to the height direction, the orthographic projections of multiple components, such as a plurality of first temperature measuring units 1082, do not overlap. The shape and number of the first temperature measuring units 1082 can be designed according to the needs of the battery pack 100; in this invention, there are no limitations on the shape and number of the first temperature measuring units 1082. Based on a similar principle, a plurality of second temperature measuring units 1092 can also be arranged at intervals.

[0038] refer to Figure 3The first flexible circuit board 108 and the second flexible circuit board 109 are both disposed between the plurality of first terminals 1022 and the plurality of second terminals 1023 of the battery pack. In one possible embodiment, the orthographic projections of the first main body portion 1081 and the second main body portion 1091 on a projection plane perpendicular to the height direction completely overlap. This arrangement of the first main body portion 1081 and the second main body portion 1091 requires a smaller dimension in the width direction, which allows for a reduction in the size of the first terminals 1022 and the second terminals 1023 of the battery 102, flexibly adapting to various usage scenarios. (Reference) Figure 3 In another possible implementation, the orthographic projections of the first main body portion 1081 and the second main body portion 1091 onto a projection plane perpendicular to the height direction only partially overlap. (See reference...) Figure 4 In another possible implementation, the orthographic projections of the first main body 1081 and the second main body 1091 on a projection plane perpendicular to the height direction are spaced apart along the width direction. In this invention, the positional relationship between the first main body 1081 and the second main body 1091 can be set according to actual needs to facilitate the assembly of the first flexible circuit board 108 and the second flexible circuit board 109 relative to the battery pack, while allowing the exhaust valve 107, as described below, to function normally.

[0039] refer to Figure 5 In a projection plane perpendicular to the height direction of the battery 102, the orthographic projections of the plurality of first temperature measuring units 1082 and the plurality of second temperature measuring units 1092 do not overlap at least partially. When subjected to an impact, the plurality of first temperature measuring units 1082 and the plurality of second temperature measuring units 1092 are configured such that the first temperature measuring units 1082 and the second temperature measuring units 1092 away from the impact location remain in place, or allow at least one of the first temperature measuring units 1082 where the first temperature sensor 1031 of the same battery 102 is located and the second temperature measuring units 1092 where the second temperature sensor 1032 of the same battery 102 is located to remain in place, thereby ensuring that at least one of the pair of temperature sensors 103 corresponding to the battery 102 continues to operate.

[0040] refer to Figure 8The first main body 1081 includes a plurality of first bends 1083 arranged along the thickness direction. Preferably, two adjacent first bends 1083 are S-shaped. Similarly, the second main body 1091 may include a plurality of second bends 1093 arranged along the thickness direction. Preferably, two adjacent second bends 1093 are S-shaped, and two adjacent first bends 1083 and two adjacent second bends 1093 aligned along the thickness direction are mirror-symmetrical about an axis parallel to the thickness direction. The gap between the first bends 1083 and second bends 1093 aligned along the thickness direction is a first gap 110. In a projection plane perpendicular to the height direction of the battery, the orthographic projection of the plurality of exhaust valves 107 is at least partially located in the first gap 110. Reference Figure 6 In another possible implementation, the first main body 1081 does not include a bending portion but includes a plurality of first through holes 111 arranged along the thickness direction. In a projection plane perpendicular to the height direction of the battery 102, the orthographic projections of the plurality of vent valves 107 are at least partially located within the plurality of first through holes 111. Similarly, the second main body 1091 may also not include a bending portion but include a plurality of first through holes 111 arranged along the thickness direction. In a projection plane perpendicular to the height direction of the battery 102, the orthographic projections of the plurality of vent valves 107 are at least partially located within the plurality of first through holes 111.

[0041] It is advantageous to provide a battery pack 100 including a first gap 110, or a battery pack 100 including a first flexible circuit board 108 and / or a second flexible circuit board 109 having a first through hole 111. When the battery 102 expands due to heat, the vent valve 107 can disengage from the battery 102 without being restricted by the first flexible circuit board 108 or the second flexible circuit board 109. This ensures the thermal safety of the battery pack 100.

[0042] refer to Figure 9 In one possible implementation, the battery pack 100 includes a positioning bracket 112. The positioning bracket 112 is configured to span a plurality of batteries 102 along its thickness direction. The positioning bracket 112 includes a bracket top surface 112a and a bracket bottom surface 112b. The bracket bottom surface 112b does not contact the top surfaces of the plurality of batteries 102 to provide sufficient space to allow the vent valve 107 to disengage from the batteries 102. In one possible implementation, a first flexible circuit board 108 and a second flexible circuit board 109 are both disposed on the bracket top surface 112a. In another possible implementation, the first flexible circuit board 108 and the second flexible circuit board 109 are disposed on the bracket top surface 112a and the bracket bottom surface 112b, respectively.

[0043] Preferably, refer to Figure 9The positioning bracket 112 includes a positioning protrusion 113 that protrudes toward the first flexible circuit board 108 and the second flexible circuit board 109. The first flexible circuit board 108 has a positioning recess 114 corresponding to the positioning protrusion 113, such as a through hole or positioning groove. The positioning protrusion 113 and the positioning recess 114 facilitate the assembly and positioning of the flexible circuit board and the positioning bracket 112.

[0044] In another possible implementation, refer to Figure 5 When the orthographic projection of the first main body 1081 in a projection plane perpendicular to the height direction and the orthographic projection of the second main body 1091 in the same projection plane are spaced apart along the width direction of the battery 102, based on a similar principle, the orthographic projections of a plurality of vent valves 107 in the same projection plane can be configured such that they are at least partially located between the first main body 1081 and the second main body 1091. This configuration of the battery pack 100 is advantageous. When the battery 102 expands due to heat, the vent valves 107 can detach from the battery 102 without being restricted by the first flexible circuit board 108 or the second flexible circuit board 109. This ensures the thermal safety of the battery pack 100.

[0045] exist Figure 7 In the illustrated embodiment, the orthographic projections of the plurality of exhaust valves 107 in a projection plane perpendicular to the height direction can be configured such that they are partially located between the orthographic projections of the first main body portion 1081 and the second main body portion 1091, and do not contact either the orthographic projections of the first main body portion 1081 or the second main body portion 1091. In this case, the distance between the orthographic projection of the exhaust valve 107 and the orthographic projection of the first main body portion 1081 is d1, in mm. The distance between the orthographic projection of the exhaust valve 107 and the orthographic projection of the second main body portion 1091 is d2, in mm, where 0.7 ≤ d1 / d2 ≤ 1.3.

[0046] Optionally, the value of d1 / d2 can be: 0.70, 0.73, 0.76, 0.79, 0.82, 0.85, 0.88, 0.91, 0.94, 0.97, 1.00, 1.03, 1.06, 1.09, 1.12, 1.15, 1.18, 1.21, 1.26, or 1.30. The ratio of d1 / d2 should not be too large or too small. When the ratio of d1 / d2 is too large, that is, when the distance between the first main body portion 1081 and the second main body portion 1091 in the width direction is too large, the length of the top surface of the battery 102 increases unnecessarily, which may result in a lower energy density of the battery pack 100. An excessively large ratio of d1 / d2 may also mean that the exhaust valve 107 is very close to the first main body portion 1081 and very far away from the second main body portion 1091. At this time, the detachment of the exhaust valve 107 will affect the operation of the first main body 1081, and consequently the operation of the plurality of first temperature sensors 1031 disposed on the first flexible circuit board 108. When the ratio of d1 / d2 is too small, that is, when the distance between the first main body 1081 and the second main body 1091 in the width direction is too small, the manufacturing precision requirements of the first flexible circuit board 108 and the second flexible circuit board 109 are increased, which may increase the cost of the battery pack 100. A ratio of d1 / d2 that is too small may also mean that the exhaust valve 107 is very far away from the first main body 1081 and very close to the second main body 1091. At this time, the detachment of the exhaust valve 107 will affect the operation of the second main body 1091, and consequently the operation of the plurality of second temperature sensors 1032 disposed on the second flexible circuit board 109.

[0047] It is understood that, based on the above range of d1 / d2, the distance between the exhaust valve 107 and the first main body 1081 can satisfy: 3.7mm≤d1≤5.7mm, and / or the distance between the exhaust valve 107 and the second main body 1091 can satisfy: 3.5mm≤d2≤5.5mm.

[0048] Optionally, d1 can be: 3.70mm, 3.81mm, 3.91mm, 4.02mm, 4.12mm, 4.23mm, 4.33mm, 4.44mm, 4.54mm, 4.65mm, 4.75mm, 4.86mm, 4.96mm, 5.07mm, 5.17mm, 5.28mm, 5.38mm, 5.49mm, 5.59mm, or 5.70mm.

[0049] Optionally, d2 can be: 3.50mm, 3.61mm, 3.71mm, 3.82mm, 3.92mm, 4.03mm, 4.13mm, 4.24mm, 4.34mm, 4.45mm, 4.55mm, 4.66mm, 4.76mm, 4.87mm, 4.97mm, 5.08mm, 5.18mm, 5.29mm, 5.39mm, or 5.50mm.

[0050] exist Figure 5 In the illustrated embodiment, the orthographic projections of the plurality of exhaust valves 107 in a projection plane perpendicular to the height direction can be configured to be partially covered by the orthographic projections of the first main body portion 1081 and the second main body portion 1091. In this case, the area of ​​each exhaust valve in the projection plane perpendicular to the height direction is S1, in mm. 2 The area covered by each exhaust valve is S2, in mm. 2 , 0.85≤S2 / S1≤1.

[0051] Optionally, the value of S2 / S1 can be: 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, or 1.00. The ratio of S2 / S1 should not be too large or too small. When the ratio of S2 / S1 is too large, that is, when the area of ​​the exhaust valve 107 covered by the first main body 1081 and the second main body 1091 is small, the area of ​​the exhaust valve 107 provided on the top surface of the battery 102 may be large. This will reduce the strength of the top surface of the battery 102 and may even affect the strength of the first terminal 1022 and the second terminal 1023. When the ratio of S2 / S1 is too small, that is, when the area covered by the first main body 1081 and the second main body 1091 of the exhaust valve 107 is large, the detachment of the exhaust valve 107 will be restricted by the first main body 1081 and / or the second main body 1091. When the battery 102 expands due to heat, the battery pack 100 configured in this way poses a high safety risk.

[0052] It is understandable that, based on S2 / S1 meeting the above range, the area of ​​each exhaust valve 107 can meet the requirement of 250mm². 2 ≤S1≤300mm 2 And / or, the area of ​​the portion of each exhaust valve 107 covered in the projection plane perpendicular to the height direction can satisfy: 250mm² 2 ≤S2≤300mm 2 .

[0053] Optionally, S1 can be: 250.00mm 2 252.63mm2 255.26mm 2 257.89mm 2 260.53mm 2 263.16mm 2 265.79mm 2 268.42mm 2 271.05mm 2 273.68mm 2 276.32mm 2 278.95mm 2 281.58mm 2 284.21mm 2 286.84mm 2 289.47mm 2 292.11mm 2 294.74mm 2 297.37mm 2 or 300.00mm 2 .

[0054] Optionally, S2 can be: 250.00mm 2 252.63mm 2 255.26mm 2 257.89mm 2 260.53mm 2 263.16mm 2 265.79mm 2 268.42mm 2 271.05mm 2 273.68mm 2 276.32mm 2 278.95mm 2 281.58mm 2 284.21mm 2 286.84mm 2 289.47mm 2 292.11mm 2 294.74mm 2 297.37mm 2 or 300.00mm 2 .

[0055] return Figure 3The battery pack 100 also includes a pair of temperature control modules 104. The pair of temperature control modules 104 at least function as a thermal management system (BMS) for the battery pack 100, including a first temperature control module 1041 and a second temperature control module 1042 that are independent of each other.

[0056] In this utility model, the term "independent of each other" means that the first temperature control module 1041 and the second temperature control module 1042 can receive and output signals independently of each other. At the same time, when either the first temperature control module 1041 or the second temperature control module 1042 is subjected to impact, detachment, or even damage, the operation of the other is not affected.

[0057] In one possible implementation, the first temperature control module 1041 and the second temperature control module 1042 can be arranged on one side of the battery pack along the thickness direction. In another possible implementation, the first temperature control module 1041 and the second temperature control module 1042 can be arranged on both sides of the battery pack along the thickness direction. Preferably, the first temperature control module 1041 and the second temperature control module 1042 are arranged on both sides of the battery pack along the thickness direction and centrally located along the width direction. This arrangement of the first temperature control module 1041 and the second temperature control module 1042 is advantageous. When multiple pairs of independent flexible circuit boards are present, as described below, the centrally located first temperature control module 1041 and the second temperature control module 1042 allow for a reduction in the size of the cables connecting the flexible circuit boards to the temperature control modules, thereby facilitating the arrangement and assembly of the battery pack 100. The first temperature control module 1041 functions to receive signals from a plurality of first temperature sensors 1031 via the first flexible circuit board 108. The second temperature control module 1042 functions to receive signals from a plurality of second temperature sensors 1032 via the second flexible circuit board 109. By setting up two independent temperature modules, two sets of independent temperature sensors 103 transmit signals to the two independent temperature modules through two independent flexible circuit boards. This configuration of the battery pack 100 is advantageous. When any of the temperature sensors 1031, 1032, flexible circuit boards 108, 109, and temperature control modules 1041, 1042 fails, the other temperature sensors 1031, 1032, flexible circuit boards 108, 109, and temperature control modules 1041, 1042 corresponding to the same battery 102 remain operational, thereby continuously sensing and monitoring the temperature of each battery 102 in the battery pack 100, thus ensuring the thermal safety of the battery pack 100.

[0058] When the battery pack 100 includes multiple battery groups, multiple pairs of independent flexible circuit boards can be provided corresponding to the number of battery groups. For example, when the battery pack 100 includes three battery groups 200 arranged along its width, three pairs of independent flexible circuit boards can be provided respectively. One pair of flexible circuit boards is provided with multiple first temperature sensors 1031, and the other pair is provided with multiple second temperature sensors 1032. One pair of flexible circuit boards is electrically connected to a first temperature control module 1041, and the other pair is electrically connected to a second temperature control module 1042.

[0059] refer to Figure 10 This utility model also discloses an electrical device 1000, including a battery pack 100 as described above. The electrical device 1000 can be a device such as a car or communication equipment that requires the battery pack 100 to be fixedly connected to the device and moved with it, or it can be a device such as a ship that allows the battery pack 100 to be moved and transported during use. As a preferred embodiment, the battery pack 100 provided by this utility model has a small size and light weight, making it particularly suitable for supplying power to ships.

[0060] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0061] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0062] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as a first temperature sensor and a second temperature sensor), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0063] The basic principles of this utility model have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this utility model are merely examples and not limitations, and should not be considered as essential features of each embodiment of this utility model. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the utility model from being implemented using the aforementioned specific details.

[0064] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: The box (101) has an internal storage space; A battery pack includes a plurality of batteries (102) arranged in the receiving space along its thickness direction; A first flexible circuit board (108) and a second flexible circuit board (109) are independent of each other. The first flexible circuit board (108) is provided with a plurality of first temperature sensors (1031) corresponding to the plurality of batteries (102), and the second flexible circuit board (109) is provided with a plurality of second temperature sensors (1032) corresponding to the plurality of batteries (102). A first temperature sensor (1031) and a second temperature sensor (1032) located on the same battery (102) are used to sense the temperature of the battery (102); and A pair of temperature control modules (104) include a first temperature control module (1041) and a second temperature control module (1042) that are independent of each other. The first temperature control module (1041) and the second temperature control module (1042) are electrically connected to the first flexible circuit board (108) and the second flexible circuit board (109), respectively.

2. The battery pack (100) according to claim 1, characterized in that, The first flexible circuit board (108) includes a first main body portion (1081) extending across the plurality of batteries (102) along the thickness direction and a plurality of first temperature measuring portions (1082) extending from the first main body portion (1081) along the length direction of the battery pack (100). The plurality of first temperature measuring portions (1082) are arranged at intervals, and a plurality of first temperature sensors (1031) are respectively disposed on the plurality of first temperature measuring portions (1082). The second flexible circuit board (109) includes a first main body portion (1081) extending across the plurality of batteries (102) along the thickness direction. The plurality of second main body portions (1091) of the plurality of batteries and the plurality of second temperature measuring portions (1092) extending from the second main body portions (1091) along the length direction are arranged at intervals. The plurality of second temperature sensors (1032) are respectively disposed on the plurality of second temperature measuring portions (1092). In the projection plane perpendicular to the height direction of the battery (102), the orthographic projection of the first main body portion (1081) and the orthographic projection of the second main body portion (1091) at least partially overlap.

3. The battery pack (100) according to claim 2, characterized in that, In the projection plane perpendicular to the height direction of the battery (102), the orthographic projections of the plurality of first temperature measuring units (1082) and the orthographic projections of the plurality of second temperature measuring units (1092) do not overlap at least partially.

4. The battery pack (100) according to claim 2, wherein the first main body (1081) includes a plurality of first bends (1083) spaced apart along the thickness direction, the second main body (1091) includes a plurality of second bends (1093) spaced apart along the thickness direction, and the gap between the first bends (1083) and the second bends (1093) aligned along the width direction of the battery (102) is a first gap (110); the plurality of batteries (102) includes a plurality of vent valves (107) aligned along the thickness direction, and in a projection plane perpendicular to the height direction of the battery (102), the orthographic projection of the plurality of vent valves (107) is at least partially located in the first gap (110).

5. The battery pack (100) according to claim 2, characterized in that, At least one of the first main body portion (1081) and the second main body portion (1091) includes a plurality of first through holes (111) arranged along the thickness direction, and the plurality of batteries (102) includes a plurality of vent valves (107) aligned along the thickness direction, and in a projection plane perpendicular to the height direction of the batteries (102), the orthographic projection of the plurality of vent valves (107) is at least partially located in the plurality of first through holes (111).

6. The battery pack (100) according to claim 1, characterized in that, It also includes a positioning bracket (112) extending along the thickness direction, the plurality of batteries (102) including a plurality of vent valves (107) aligned along the thickness direction, the plurality of vent valves (107) being located on one side of the positioning bracket (112) along the height direction of the battery (102) and spaced apart from the plurality of vent valves (107) along the height direction, the first flexible circuit board (108) and the second flexible circuit board (109) being located on the other side of the positioning bracket (112) along the height direction.

7. The battery pack (100) according to claim 6, characterized in that, The positioning bracket (112) includes a positioning protrusion (113) protruding toward the first flexible circuit board (108) and the second flexible circuit board (109), and at least one of the first flexible circuit board (108) and the second flexible circuit board (109) is provided with a positioning recess (114) that cooperates with the positioning protrusion (113).

8. The battery pack (100) according to claim 1, characterized in that, The first flexible circuit board (108) includes a first main body (1081) extending across the plurality of batteries (102) along the thickness direction and a plurality of first temperature measuring parts (1082) extending from the first main body (1081). The plurality of first temperature measuring parts (1082) are arranged at intervals. A plurality of first temperature sensors (1031) are respectively disposed on the plurality of first temperature measuring parts (1082). The second flexible circuit board (109) includes a second main body (1091) extending across the plurality of batteries (102) along the thickness direction and a plurality of second temperature measuring parts (1092) extending from the second main body (1091). The plurality of second temperature measuring parts (1092) are arranged at intervals. A plurality of second temperature sensors (1032) are respectively disposed on the plurality of second temperature measuring parts (1092). In the projection plane perpendicular to the height direction of the battery (102), the orthographic projection of the first main body (1081) and the orthographic projection of the second main body (1091) do not overlap at all.

9. The battery pack (100) according to claim 8, characterized in that, In a projection plane perpendicular to the height direction, the orthographic projection of the first main body (1081) and the orthographic projection of the second main body (1091) are spaced apart along the width direction of the battery (102).

10. The battery pack (100) according to claim 9, characterized in that, The plurality of batteries (102) include a plurality of vent valves (107) aligned along the thickness direction, wherein, in a projection plane perpendicular to the height direction, the orthographic projection of the plurality of vent valves (107) is at least partially located between the orthographic projection of the first main body portion (1081) and the orthographic projection of the second main body portion (1091).

11. The battery pack (100) according to claim 10, characterized in that, In the width direction, the distance between one end of the orthographic projection of each exhaust valve (107) along the length direction of the battery pack (100) and the orthographic projection of the first main body (1081) is d1, in mm, and the distance between the other end of the orthographic projection of each exhaust valve (107) along the length direction of the battery pack (100) and the orthographic projection of the second main body (1091) is d2, in mm, 0.7≤d1 / d2≤1.3, and / or, 3.7mm≤d1≤5.7mm, and / or, 3.5mm≤d2≤5.5mm.

12. The battery pack (100) according to claim 10, characterized in that, The orthographic projections of the plurality of exhaust valves (107) are partially located between the orthographic projections of the first main body (1081) and the second main body (1091). In the projection plane perpendicular to the height direction, the area of ​​each exhaust valve (107) is S1, in mm. 2 The area covered by each exhaust valve (107) is S2, in mm. 2 , 0.85≤S2 / S1≤1, and / or, 250mm 2 ≤S1≤300mm 2 , and / or 250mm 2 ≤S2≤300mm 2 .

13. The battery pack (100) according to claim 1, characterized in that, The first temperature control module (1041) and the second temperature control module (1042) are located on the same side of the battery pack along the thickness direction, or the first temperature control module (1041) and the second temperature control module (1042) are respectively arranged on both sides of the battery pack along the thickness direction.

14. The battery pack (100) according to claim 1, characterized in that, The system includes multiple battery packs, and multiple first flexible circuit boards (108) corresponding to the multiple battery packs are electrically connected to the same first temperature control module (1041), and multiple second flexible circuit boards (109) corresponding to the multiple battery packs are electrically connected to the same second temperature control module (1042).

15. The battery pack (100) according to claim 14, characterized in that, The first temperature control module (1041) and the second temperature control module (1042) are respectively arranged on both sides of the plurality of battery packs along the thickness direction. Either the first temperature control module (1041) or the second temperature control module (1042) is arranged in the center of the battery (102) relative to the plurality of battery packs.

16. The battery pack (100) according to claim 1, characterized in that, It also includes a positioning bracket (112) extending along the thickness direction, the plurality of batteries (102) including a plurality of vent valves (107) aligned along the thickness direction, the plurality of vent valves (107) being located on one side of the positioning bracket (112) along the height direction of the battery (102) and spaced apart from the plurality of vent valves (107) along the height direction, the first flexible circuit board (108) and the second flexible circuit board (109) being located on both sides of the positioning bracket (112) along the height direction, and one of the first flexible circuit board (108) and the second flexible circuit board (109) adjacent to the plurality of vent valves (107) being spaced apart from the plurality of vent valves (107) along the height direction.

17. An electrical appliance (1000), characterized in that, Includes the battery pack (100) according to any one of claims 1 to 16.

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