Battery pack having temperature monitoring function, and energy storage system

Abstract

The present application relates to the technical field of batteries, and in particular to a battery pack having a temperature monitoring function, and an energy storage system. The battery pack having a temperature monitoring function comprises a module support, a plurality of battery cells, a wire harness, a heat conduction assembly, and a temperature sensor. The module support is used for fixing the plurality of battery cells arranged in sequence; the heat conduction assembly is fixed on the module support; the heat conduction assembly is in contact with the surface of each battery cell among the plurality of battery cells for heat conduction; the temperature sensor is in contact with the surface of the heat conduction assembly; the temperature sensor is used for collecting temperature information of the heat conduction assembly; and one end of the wire harness is electrically connected to the temperature sensor, and the other end of the wire harness is configured to be electrically connected to a controller, so as to transmit signals between the temperature sensor and the controller. The battery pack provided by the present application can reduce the number of temperature sensors, thereby simplifying the structure of the battery pack, and reducing costs of the battery pack.

Description

Battery pack and energy storage system with temperature monitoring function

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on January 23, 2024, with application number 202410094892.X and application name "A battery pack and energy storage system with temperature monitoring function", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery pack and energy storage system with temperature monitoring function. Background Art

[0004] With the development and widespread application of new energy technologies, battery packs, as a crucial component of these technologies, have become a crucial issue for ensuring their safety during use. Prior art systems typically use multiple temperature sensors to collect the temperatures of the multiple battery cells within a battery pack. Specifically, each temperature sensor monitors the temperature of one or two battery cells, increasing the complexity and cost of the battery pack. Summary of the Invention

[0005] The present invention provides a battery pack and energy storage system with temperature monitoring function. The battery pack can reduce the number of temperature sensors, simplify the battery pack structure, and reduce the cost of the battery pack.

[0006] In a first aspect, the present application provides a battery pack with temperature monitoring functionality. The battery pack includes a module bracket, multiple battery cells, a wiring harness, a thermal conductive assembly, and a temperature sensor. The module bracket is used to secure multiple battery cells arranged in sequence. The thermal conductive assembly is secured to the module bracket and contacts the surface of each of the multiple battery cells for heat conduction. The temperature sensor contacts the surface of the thermal conductive assembly and is used to collect temperature information from the thermal conductive assembly. One end of the wiring harness is electrically connected to the temperature sensor, and the other end of the wiring harness is electrically connected to a controller for signal transmission between the temperature sensor and the controller. When any one or more of the multiple battery cells malfunction and experience temperature anomalies, the temperature of the thermal conductive assembly will also change with the temperature of the battery cells. The temperature sensor, contacting the surface of the thermal conductive assembly, can collect the temperature of the thermal conductive assembly in real time. It can be understood that a temperature sensor contacting the surface of the thermal conductive assembly can collect the temperatures of multiple battery cells in real time and transmit the collected temperature signals to the controller via the wiring harness, thereby enabling timely detection of battery pack anomalies and preventing the battery pack from overheating and causing danger. In this method, only one temperature sensor needs to be in contact with the surface of the thermal conductive component. One temperature sensor can detect temperature anomalies of multiple battery cells through the thermal conductive component, thereby reducing the number of temperature sensors, simplifying the structure of the battery pack, optimizing the battery management system, and reducing costs.

[0007] In one embodiment, the heat conduction assembly includes a heat conductor and a heat conductor bracket. The heat conductor bracket is fixed to the module bracket. The heat conductor bracket has a receiving cavity, and the heat conductor is disposed within the receiving cavity. The temperature sensor is disposed on the surface of the heat conductor. The heat conductor contacts the surface of each of the multiple battery cells to conduct heat. In this method, the heat conductor bracket is fixed to the module bracket, thereby improving the stability of the heat conductor's contact with the multiple battery cells.

[0008] The heat conducting element may be a heat pipe, or the material of the heat conducting element may be graphene. The heat conducting element may also be other heat conducting materials.

[0009] In one embodiment, the heat conductive assembly further includes a plurality of first thermal pads, the heat conductive member bracket is a tubular structure, the heat conductive member bracket includes a plurality of heat conductive holes arranged along the extension direction of the heat conductive member bracket, the plurality of heat conductive holes are all connected to the accommodating cavity, the opening of each heat conductive hole faces at least one battery cell, and the plurality of first thermal pads are placed one by one in the plurality of heat conductive holes, one end of each first thermal pad contacts the heat conductive member, and the other end of each first thermal pad contacts at least one battery cell. The openings of the heat conductive holes face the plurality of battery cells, which can ensure that after the heat conductive member is set in the accommodating cavity of the heat conductive member bracket, the heat conductive member can contact the plurality of battery cells through the first thermal pads set in the plurality of heat conductive holes. Among them, the provision of the first thermal pad can ensure that the heat conductive member is in more stable contact with the surfaces of the plurality of battery cells.

[0010] In one embodiment, the plurality of thermal vias are arranged in a one-to-one correspondence with the plurality of battery cells, with one end of each first thermal pad contacting the heat conductor, and the other end of each first thermal pad contacting a corresponding battery cell. Alternatively, some of the plurality of thermal vias correspond to two battery cells, in which case the thermal vias may be located between the two battery cells.

[0011] In one embodiment, the thermally conductive assembly further includes a second thermally conductive pad. The thermally conductive member holder includes a slot, the slot opening facing the plurality of battery cells, the slot extending in the same direction as the thermally conductive member holder, the slot communicating with the accommodating cavity, and the second thermally conductive pad disposed within the slot. One end of the second thermally conductive pad contacts the thermally conductive member, while the other end of the second thermally conductive pad contacts the surface of each of the plurality of battery cells. The provision of the slot facilitates convenient installation of the thermally conductive member on the thermally conductive member holder and increases the contact area between the thermally conductive member and the second thermally conductive pad, thereby increasing the contact area between the thermally conductive member and each battery cell.

[0012] In one embodiment, a heat conductor bracket is disposed on the side of a plurality of battery cells, and the module bracket includes a first bracket and a second bracket at both ends in the height direction of the battery cells, respectively. The heat conductive assembly includes a plurality of positioning plates. The heat conductor bracket is located between the first bracket and the second bracket in the height direction of the battery cells. The plurality of positioning plates are sequentially arranged along the extension direction of the heat conductor bracket. In the height direction of the battery cells, the positioning plates sequentially connect the first bracket, the heat conductor bracket, and the second bracket. In this manner, the heat conductor bracket can be located in the same plane as the surfaces of the first bracket and the second bracket on the side away from the battery cells, thereby reducing the space occupied by the heat conductor bracket. In addition, the positioning plates can be detachably connected to the first bracket and the second bracket, thereby facilitating the disassembly of the heat conductor bracket from the first bracket and the second bracket.

[0013] In one embodiment, a heat conductor bracket is disposed on the top surface of multiple battery cells, or on the side surface of multiple battery cells. The module bracket includes a third bracket and a fourth bracket at each end in the longitudinal direction of the battery cells. The heat conductor bracket is provided with a fixing hole at the upper end in the extension direction. Connectors pass through the fixing holes to fix the ends of the heat conductor bracket in the extension direction to the third bracket and the fourth bracket, respectively. The heat conductor bracket can be disposed in multiple positions, adjusted according to actual needs. The heat conductor bracket is detachably connected to the third bracket and the fourth bracket through the fixing holes to facilitate maintenance of components such as the heat conductor and the temperature sensor.

[0014] In the above-described embodiments, the heat conducting member bracket may be linear, zigzag, or curved, and may be disposed on the top surface of the plurality of battery cells, or on one side of the plurality of battery cells, or may be two heat conducting member brackets, one on each side of the plurality of battery cells. When there are two heat conducting member brackets, each is provided with a heat conducting member and a temperature sensor in contact with the heat conducting member. Both temperature sensors are electrically connected to the controller via a wiring harness. Both temperature sensors are capable of detecting the temperatures of the plurality of battery cells. Damage or abnormality in any one temperature sensor does not affect detection of the plurality of battery cells, thereby improving the safety of the battery pack. Furthermore, the two heat conducting member brackets may have different shapes.

[0015] In one embodiment, the thermal conductor bracket can be U-shaped, surrounding two side surfaces of the multiple battery cells. When the thermal conductor bracket is U-shaped, the corresponding thermal conductor can also be U-shaped, allowing the thermal conductor to contact two side surfaces of the multiple battery cells, thereby increasing the thermal conductor's sensitivity to temperature changes.

[0016] In one embodiment, to facilitate electrical connection between the wiring harness and the temperature sensor, the heat conducting member bracket includes a connection hole located on a side of the heat conducting member bracket away from the multiple battery cells, and the wiring harness is electrically connected to the temperature sensor through the connection hole.

[0017] In the second aspect, the present application also provides an energy storage system, which includes a power converter and a battery pack with temperature monitoring function in any technical solution of the first aspect; the power converter is used to convert the voltage output by multiple battery packs into power and output it to the power grid or load, or to convert the voltage output by an external power supply into power and output it to the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of a battery pack with a temperature monitoring function provided in an embodiment of the present application;

[0019] FIG2 is an exploded view of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0020] FIG3 is a schematic diagram of another structure of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0021] FIG4 is another exploded view of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0022] FIG5 is a schematic structural diagram of a heat conducting member support in a battery pack with a temperature monitoring function provided by an embodiment of the present application;

[0023] FIG6 is a front view of a heat conducting member bracket provided in an embodiment of the present application;

[0024] FIG7 is another front view of the heat conducting member bracket provided in an embodiment of the present application;

[0025] FIG8 is another exploded view of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0026] FIG9 is another exploded view of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0027] FIG10 is a schematic diagram of another structure of a heat conducting member support in a battery pack with a temperature monitoring function provided in an embodiment of the present application;

[0028] FIG11 is a schematic diagram of another structure of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0029] FIG12 is an exploded view of FIG11 ;

[0030] FIG13 is another exploded view of a battery pack with a temperature monitoring function according to an embodiment of the present application;

[0031] FIG14 is a schematic diagram of another structure of a heat conducting member support in a battery pack with a temperature monitoring function provided by an embodiment of the present application;

[0032] Figures 15a and 15b are schematic diagrams of the connection structure of an energy storage system provided in an embodiment of the present application.

[0033] Figure markings: 10-module bracket; 11-third bracket; 12-fourth bracket; 13-connecting plate; 14-second fireproof cotton; 15-first bracket; 16-second bracket; 20-battery cell; 21-first fireproof cotton; 30-wiring harness; 40-thermal conductive assembly; 41-thermal conductor; 42-thermal conductor bracket; 420-fixing hole; 421-thermal hole; 422-connecting hole; 423-slot; 43-first thermal pad; 44-positioning plate; 45-second thermal pad; 50-temperature sensor; 60-first conductive bar; 70-second conductive bar. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0035] Electric vehicles and other stationary energy storage systems include battery packs, which contain multiple temperature sensors. These sensors collect temperature information from the battery cells and transmit it to a battery monitoring unit (BMU) to reduce the risk of battery pack failure. While this approach can detect abnormalities in the battery cells, the large number of temperature sensors complicates the battery pack's structure and increases costs.

[0036] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the", and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise.

[0037] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0038] Figure 1 is a schematic diagram of a battery pack with a temperature monitoring function according to an embodiment of the present application. Figure 2 is an exploded view of Figure 1. Figure 3 is another schematic diagram of a battery pack with a temperature monitoring function according to an embodiment of the present application. Figure 4 is an exploded view of Figure 3. Referring to Figures 1, 2, 3, and 4, the battery pack with a temperature monitoring function according to an embodiment of the present application includes a module support 10, a plurality of battery cells 20, a wiring harness 30, a thermal conductive assembly 40, and a temperature sensor 50. The module support 10 is used to secure the plurality of battery cells 20. The thermal conductive assembly 40 is secured to the module support 10 and contacts the surface of each of the plurality of battery cells 20 for heat conduction. The temperature sensor 50 contacts the surface of the thermal conductive assembly 40 to collect temperature information from the thermal conductive assembly 40. One end of the wiring harness 30 is electrically connected to the temperature sensor 50, and the other end of the wiring harness 30 is electrically connected to a controller to transmit signals between the temperature sensor 50 and the controller. The signals are the temperature signals of the battery cells 20. In this embodiment, the controller can determine whether multiple battery cells 20 are overheating based on signals transmitted by the wiring harness 30, thereby preventing the battery cells 20 from overheating and causing hazards such as fire. The thermal conductive assembly 40 contacts the surfaces of the multiple battery cells 20, and the heat generated by each battery cell 20 is transferred to the thermal conductive assembly 40. When any one or more of the multiple battery cells 20 malfunction and experience temperature abnormalities, the temperature of the thermal conductive assembly 40 will also change with the temperature of the battery cells 20. The temperature sensor 50 disposed on the thermal conductive assembly 40 can collect the temperature of the thermal conductive assembly 40 in real time. It can be understood that a temperature sensor 50 in contact with the surface of the thermal conductive assembly 40 can collect the temperatures of multiple battery cells 20 in real time and transmit the collected signals to the controller via the wiring harness 30, thereby enabling timely detection of battery pack abnormalities and preventing the battery pack from overheating and causing danger. In this method, only a temperature sensor 50 electrically connected to the wiring harness 30 needs to be provided on the thermal conductive component 40. One temperature sensor 50 can detect temperature anomalies of multiple battery cells 20 through the thermal conductive component 40, thereby reducing the number of temperature sensors 50, simplifying the structure of the battery pack, optimizing the battery management system, and reducing costs.

[0039] Continuing to refer to Figures 1, 2, 3 and 4, in one embodiment, a plurality of battery cells 20 are arranged in sequence in the accommodation space of the module support 10 along the first direction X, and one battery cell 20 is provided in each column along the second direction Y. In the above embodiment, in order to ensure the safety between two adjacent battery cells 20, a first fireproof cotton 21 can be provided between the two adjacent battery cells 20. The first fireproof cotton 21 can reduce the impact of high-temperature spontaneous combustion of any battery cell 20 between the two adjacent battery cells 20 on other battery cells 20, thereby improving the safety of the battery pack. Among them, the shape of the module support 10 can be circular, rectangular, diamond-shaped, etc. The shape of the battery cell 20 can be long strip or cylindrical, etc.

[0040] In one embodiment, each battery cell 20 includes a positive electrode connection portion and a negative electrode connection portion. The positive electrode connection portion and the negative electrode connection portion included in each battery cell 20 can be located on the same side of the battery cell 20, and the positive electrode connection portion and the negative electrode connection portion are arranged along the second direction Y, and there is a gap between the positive electrode connection portion and the negative electrode connection portion.

[0041] In the above-mentioned embodiment, the battery pack with temperature monitoring function also includes a conductive bar group, which includes a first conductive bar group and a second conductive bar group. The first conductive bar group and the second conductive bar group are adjacent to each other along the second direction with a gap therebetween. The first conductive bar group includes a plurality of first conductive bars 60, and the second conductive bar group includes a plurality of second conductive bars 70. The first conductive bars 60 and the second conductive bars 70 can be aluminum bars. The first conductive bar 60 electrically connects the positive and negative electrode terminals on two adjacent battery cells 20 along the first direction X, so that the two adjacent battery cells 20 are connected in series. The second conductive bar 70 electrically connects the positive and negative electrode terminals on two adjacent battery cells 20 along the first direction X, so that the two adjacent battery cells 20 are connected in series. The wiring harness 30 is electrically connected to the plurality of first conductive bars 60 and the plurality of second conductive bars 70, respectively.

[0042] Continuing with Figures 1, 2, 3, and 4, in one embodiment, the module support 10 includes a third support 11, a fourth support 12, and multiple connecting plates 13. The multiple connecting plates 13 connect the third and fourth supports 11, 12 to form a storage space for multiple battery cells 20. Along a first direction X, a second fireproof cotton 14 is disposed between the third support 11 and a battery cell 20 at one end. A second fireproof cotton 14 may also be disposed between the fourth support 12 and a battery cell 20 at the other end. The positive and negative terminal connections of the multiple battery cells 20 located between the third and fourth supports 11, 12 are located on the same side of each battery cell 20. The multiple first conductive bars 60 of the first conductive bar group are arranged in the same direction as the multiple battery cells 20. The multiple second conductive bars 70 of the second conductive bar group are arranged in the same direction as the multiple battery cells 20. A portion of the first conductive bar 60 electrically connects the positive and negative electrode terminals of adjacent battery cells 20, and a portion of the second conductive bar 70 electrically connects the positive and negative electrode terminals of two adjacent battery cells 20. One end of a first conductive bar 60 located at an end portion is electrically connected to the positive electrode terminal, and the other end extends outside the fourth bracket 12. One end of a second conductive bar 70 located at an end portion is electrically connected to the negative electrode terminal, and the other end extends outside the third bracket 11. The portions of the first and second conductive bars 60 and 70 located outside the battery pack are located on both sides of the battery pack along the arrangement direction of the battery cells. This means that the portions of the first and second conductive bars located outside the battery pack are located on both sides of the battery pack along the first direction X.

[0043] In the above embodiment, the thermal conductive assembly 40 includes a thermal conductive member 41 and a thermal conductive member bracket 42. The thermal conductive member bracket 42 is fixed to the module bracket 10 and defines a receiving cavity. The thermal conductive member 41 is disposed within the receiving cavity. A temperature sensor 50 is disposed on the surface of the thermal conductive member 41. The thermal conductive member 41 contacts the surfaces of the multiple battery cells 20 for heat conduction. When one or more of the multiple battery cells 20 malfunction and experience a temperature abnormality, the contact between the thermal conductive member 41 and the surfaces of the multiple battery cells 20 causes the temperature of the thermal conductive member 41 to change with the temperature of one or more battery cells 20. The temperature sensor 50 can detect the temperature change of the thermal conductive member 41 in real time and transmit the temperature change signal to the controller via the wiring harness 30. The temperature sensor 50 can be disposed on the side of the thermal conductive member 41 facing away from the surfaces of the multiple battery cells 20, or on the side of the thermal conductive member 41, with the other end of the temperature sensor 50 extending outside the receiving cavity. It can be understood that the other end of the temperature sensor 50 is located outside the thermal conductive member bracket 42. Alternatively, the other end of the temperature sensor 50 is located in the accommodating cavity, that is, the temperature sensor 50 is located in the accommodating cavity included in the heat conducting member bracket 42 .

[0044] It is worth mentioning that the heat conducting member 41 can have various structural forms, such as a heat pipe, or a graphene material. The heat conducting member 41 can also have other structural forms, which are not listed here.

[0045] Figure 5 is a structural schematic diagram of a heat-conducting member bracket in a battery pack with a temperature monitoring function provided in an embodiment of the present application; Figure 6 is a front view of Figure 5. Continuing to refer to Figures 1, 2, 5 and 6, in one embodiment, a heat-conducting member bracket 42 is arranged on the top surface of a plurality of battery cells 20. At this time, the positive electrode connection portion and the negative electrode connection portion included in the plurality of battery cells 20 are located on the same side of the battery cells 20. The heat-conducting member bracket 42 is located between the first conductive row group and the second conductive row group along the second direction Y. The heat-conducting member bracket 42 extends along the first direction X, and fixing holes 420 are provided at both ends of the heat-conducting member bracket 42. The connecting member passes through the fixing hole 420 to connect to the top surface of the third bracket 11 and the fourth bracket 12. The connecting member can be a screw.

[0046] Continuing with Figures 3, 4, 5, and 6, in one embodiment, a heat conducting member bracket 42 is disposed on the side of multiple battery cells 20. The heat conducting member bracket 42 extends along a first direction X, and fixing holes 420 are provided at both ends of the heat conducting member bracket 42. Connectors pass through the fixing holes 420 to connect to the side surfaces of the third bracket 11 and the fourth bracket 12. Specifically, when the heat conducting member bracket 42 is disposed on the side of multiple battery cells 20, there may be two heat conducting member brackets 42, with the two heat conducting member brackets 42 located on both sides of the multiple battery cells 20 along the second direction Y. Each heat conducting member bracket 42 may be provided with a temperature sensor 50, and both temperature sensors 50 are electrically connected to the wiring harness. The provision of two temperature sensors 50 can improve the detection effect of multiple battery cells 20 and reduce the risk of battery pack damage.

[0047] It is worth noting that the heat conducting member bracket 42 can be linear along the first direction X, or it can be a zigzag line along the first direction, or it can be curved along the first direction, as long as the extension path of the heat conducting member bracket 42 passes through multiple battery cells 20. Furthermore, when the other end of the temperature sensor 50 extends outside the heat conducting member bracket 42, the wiring harness 30 is directly electrically connected to the other end of the temperature sensor 50 located outside the heat conducting member bracket 42. When the other end of the temperature sensor 50 is located inside the heat conducting member bracket 42, the heat conducting member bracket 42 is provided with a connection hole 422. There is at least one connection hole 422, as long as the wiring harness 30 can pass through the connection hole 422 and electrically connect to the temperature sensor 50 disposed on the heat conducting member 41. Specifically, the connection hole 422 can be provided on the side of the heat conducting member bracket 42 facing away from the multiple battery cells 20, or the connection hole 422 can be provided on the side of the heat conducting member bracket 42.

[0048] Continuing with Figures 1, 4, and 6, in the above-described embodiment, the thermal assembly 40 further includes a plurality of first thermal pads 43. The thermal member support 42 is a tubular structure and includes a plurality of thermal holes 421. The plurality of thermal holes 421 are arranged in the direction of extension of the thermal member support 42. The plurality of thermal holes 421 are connected to the accommodating cavity, and each thermal hole 421 opens toward at least one battery cell 20. The plurality of first thermal pads 43 are positioned within the plurality of thermal holes 421 in a one-to-one correspondence. One end of each first thermal pad 43 contacts the thermal member 41, and the other end of each first thermal pad 43 contacts at least one battery cell 20. The provision of the first thermal pads 43 ensures more stable contact between the thermal member 41 and the plurality of battery cells 20, allowing the temperature of the battery cells 20 to be more stably transferred to the thermal member 41. When the thermal assembly 40 includes the plurality of first thermal pads 43, heat generated by the battery cells 20 can be transferred to the thermal member 41 via the first thermal pads 43. When any one or more of the multiple battery cells 20 fail and temperature abnormalities occur, the temperature of the first thermal pad 43 will change with the change in the temperature of the battery cell 20. Therefore, the temperature of the thermal conductor 41 will also change with the change in the temperature of the battery cell 20. The temperature sensor 50 provided on the thermal conductor 41 can collect the temperature on the thermal conductor 41 in real time and transmit the collected temperature to the controller through the wiring harness 30. The controller can monitor the battery pack based on the temperature information detected by the temperature sensor 50 to prevent the occurrence of danger.

[0049] In one embodiment, the heat conductive assembly includes a heat conductive pad, and the heat conductive member has a protrusion on the side facing the heat conductive hole 421. The multiple protrusions are arranged in a one-to-one correspondence with the heat conductive holes 421, and the protrusions are attached to the heat conductive member 41 through the heat conductive holes 421.

[0050] Continuing with reference to Figures 1, 4, and 6, in one embodiment, five thermal vias 421 correspond to five battery cells 20, i.e., each thermal via 421 corresponds to one battery cell 20. In this case, one end of a first thermal pad 43 contacts one battery cell 20, and the other end of a first thermal pad 43 contacts the heat conducting member 41 through one thermal via 421. Figure 7 is another front view of Figure 5. Referring to Figure 7, in some other embodiments, at least one of the plurality of thermal vias 421 may correspond to two battery cells. In this case, as the length of a thermal via 421 along the first direction X increases, the length of the first thermal pad along the first direction X also increases, so that one first thermal pad 43 disposed in a first thermal via 421 can contact two battery cells.

[0051] Figure 8 is another exploded view of Figure 1, Figure 9 is another exploded view of Figure 3, and Figure 10 is another structural schematic diagram of the heat conductive member bracket in the battery pack with temperature monitoring function provided in an embodiment of the present application; referring to Figures 8, 9 and 10, in one embodiment, the heat conductive assembly includes a second thermal pad 45, the heat conductive member bracket 42 includes a slot 423, the slot 423 is connected to the accommodating cavity of the heat conductive member bracket 42, the opening of the slot 423 faces the multiple battery cells 20, and the extension direction of the slot 423 is the same as the extension direction of the heat conductive member bracket 42, the second thermal pad 45 is arranged in the slot 423, one end of the second thermal pad 45 is in contact with the heat conductive member 41, and the other end of the second thermal pad 45 is in contact with the surface of the multiple battery cells 20. In this embodiment, the length of the slot 423 can be substantially the same as the length of the heat conducting member support 42. When the heat conducting member support 42 has the slot 423, the heat conducting member support 42 can be disposed on the top surfaces of the plurality of battery cells 20, extending along the first direction X. In this case, the opening of the slot 423 faces the top surfaces of the plurality of battery cells 20. Alternatively, the heat conducting member support 42 can be disposed on the side surfaces of the plurality of battery cells 20, extending along the first direction X. In this case, the opening of the slot 423 faces the side surfaces of the plurality of battery cells 20. The temperature of the second thermal pad 45 changes with the temperature of the top surfaces of the respective battery cells 20. The second thermal pad 45 transmits the temperature to the heat conducting member 41. The temperature sensor 50 in contact with the surface of the heat conducting member 41 can collect temperature information of the heat conducting member 41 and transmit this information to the controller via a wiring harness to monitor the plurality of battery cells 20.

[0052] Figure 11 is a schematic diagram of another embodiment of a battery pack with temperature monitoring functionality; Figure 12 is an exploded view of Figure 11; and Figure 13 is another exploded view of Figure 11. Referring to Figures 11, 12, and 13, the module support 10 includes a first support 15 and a second support 16, spaced apart along the height direction (third direction Z) of the battery cells. The thermal conductive assembly 40 includes a plurality of positioning plates 44. A thermal conductive support 42 is positioned between the first support 15 and the second support 16 along the height direction of the battery cells 20. The positioning plates 44 are sequentially arranged along the extension direction of the thermal conductive support 42. Along the height direction of the battery cells 20, the positioning plates 44 sequentially connect the first support 15, the thermal conductive support 42, and the second support 16. The positive and negative terminal portions of the battery cells 20 are located on either side of the battery cells 20 along the height direction. Accordingly, the first and second conductive bar groups are positioned on either side of the battery cells 20 to electrically connect to the positive and negative terminal portions, respectively. To facilitate electrical connection with the first and second conductive bar groups, a wiring harness 30 is disposed between the first bracket 15 and the second bracket 16. The wiring harness 30 is electrically connected to the first and second conductive bar groups, including a plurality of first conductive bars 60, and the second and second conductive bar groups, including a plurality of second conductive bars 70. The wiring harness 30 is also electrically connected to the temperature sensor 50. In this configuration, if any one or more of the battery cells 20 malfunctions and experiences a temperature anomaly, the temperature of the thermal conductor 41 will also change with the temperature of the battery cells 20. The temperature sensor 50 disposed on the thermal conductor 41 can collect the temperature of the thermal conductor 41 in real time. It can be understood that a single temperature sensor 50 disposed on the thermal conductor 41 can collect the temperatures of multiple battery cells 20 in real time and transmit the collected temperature signals to the controller via the wiring harness 30, thereby enabling timely detection of battery pack anomalies and preventing the battery pack from overheating and causing danger. In this method, only a temperature sensor 50 electrically connected to the wiring harness 30 needs to be provided on the heat conductor 41. One temperature sensor 50 can detect temperature anomalies of multiple battery cells 20 through the heat conductor 41, thereby reducing the number of temperature sensors 50, simplifying the structure of the battery pack, optimizing the battery management system, and reducing costs.

[0053] The extending direction of the plurality of positioning plates 44 may be perpendicular to the extending direction of the heat conducting member bracket 42 , and the number of the positioning plates 44 may be adjusted as needed.

[0054] It should be noted that the definition of perpendicularity in the embodiments of this application is not limited to an absolute 90-degree intersection angle. Due to factors such as assembly tolerance, design tolerance, and structural flatness, a small angle error is allowed. For example, 80 to 100 degrees can be understood as a perpendicular relationship within the assembly error range.

[0055] In one embodiment, the heat conductor bracket 42 includes a slot 423. The slot 423 extends in the same direction as the heat conductor bracket 42. The opening of the slot 423 faces the multiple battery cells 20. The heat conductor 41 is disposed in the slot 423. The heat conductor 41 contacts the multiple battery cells 20 through the opening of the slot 423. The provision of the slot 423 facilitates the placement of the heat conductor 41 in the heat conductor bracket 42. The heat conductor 41 can contact the surfaces of the multiple battery cells 20 through the slot 423, or it can partially contact each battery cell 20 through the slot 423. In this manner, the heat conductor 41 directly contacts the surfaces of the multiple battery cells 20, transferring heat to each battery cell 20.

[0056] In one embodiment, the heat conductive assembly 40 further includes a second thermal pad 45, which is disposed between the slot 423 and the side surfaces of the plurality of battery cells 20. After the heat conductive member 41 is disposed in the slot 423, the second thermal pad 45 is located between the heat conductive member 41 and the side surfaces of the plurality of battery cells 20. The heat conductive member 41 collects the temperatures of the plurality of battery cells 20 through the second thermal pad 45. The provision of the second thermal pad 45 can improve the tightness between the heat conductive member 41 and the battery cells 20. The second thermal pad 45 is an integral plate-like structure, and one second thermal pad 45 contacts the side surfaces of the plurality of battery cells 20 to absorb the heat generated by each battery cell 20.

[0057] In one embodiment, the thermal pad between the thermal conductor 41 of the multiple battery cells 20 may also be in the form of multiple first thermal pads as shown in Figures 2 and 4, and each first thermal pad is located between a battery cell 20 and the thermal conductor 41. It is worth mentioning that Figure 14 is another structural schematic diagram of the thermal conductor bracket in the battery pack with temperature monitoring function provided in the embodiment of the present application. Referring to Figure 14, when the thermal conductor bracket 42 is linear and the thermal conductor bracket 42 is arranged between the first bracket and the second bracket, the spacing between adjacent positioning plates 44 can be adjusted as needed, and the number of positioning plates 44 on the thermal conductor bracket 42 is greater than two to ensure the stability of the connection between the thermal conductor bracket 42 and the first bracket and the second bracket. It is worth mentioning that when the thermal conductor bracket 42 is linear and is located between the first bracket and the second bracket, there can be two thermal conductor brackets 42, and the two thermal conductor brackets 42 are located on both sides of the multiple battery cells. In addition, the heat conducting member bracket 42 located between the first bracket and the second bracket can be zigzag or curved. When there are two heat conducting member brackets 42, each heat conducting member bracket 42 is provided with a heat conducting member 41 and a temperature sensor 50 in contact with the heat conducting member 41. Both temperature sensors 50 are electrically connected to the controller via a wiring harness 30. Both temperature sensors 50 can detect the temperature of multiple battery cells 20. If any temperature sensor 50 is damaged or abnormal, it will not affect the detection of multiple battery cells 20, thereby improving the safety of the battery pack. The two heat conducting member brackets 42 can have different shapes.

[0058] 11 , 12 and 13 , in one embodiment, the heat conducting member bracket 42 may be U-shaped. The U-shaped heat conducting member bracket 42 is arranged around two side surfaces of the plurality of battery cells 20 to wrap three sides of the plurality of battery cells 20. When the heat conducting member bracket 42 is detachably fixedly connected to the first bracket and the second bracket through the positioning plate 44 , the heat conducting member bracket 42 wraps the plurality of battery cells 20, thereby improving the stability of the installation of the battery cells 20.

[0059] In the above embodiment, when the temperature sensor 50 is disposed in the accommodating cavity of the thermal conductive member bracket 42, the thermal conductive member bracket 42 includes a connection hole 422, and the connection hole 422 can be located on the side of the thermal conductive member bracket 42 facing away from the plurality of battery cells 20. The wiring harness 30 is electrically connected to the temperature sensor 50 through the connection hole 422. The location of the temperature sensor 50 in the accommodating cavity can prevent the temperature sensor 50 from being damaged by external forces, thereby increasing the service life of the temperature sensor 50. Furthermore, the temperature sensor 50 can be positioned close to the connection hole 422 to facilitate electrical connection between the wiring harness 30 and the temperature sensor 50.

[0060] An embodiment of the present application provides an energy storage system. Figures 15a and 15b are schematic diagrams of the connection structure of an energy storage system. Referring to Figures 15a and 15b, the energy storage system includes the battery pack and a power converter of the present application. The power converter is used to convert the voltage output by the battery pack into power and output it to the power grid or external load, or the power converter is used to convert the voltage output by an external power source into power and output it to the battery pack. The battery pack can be connected to a photovoltaic module, and the photovoltaic module is used to charge the battery pack.

[0061] It is worth mentioning that the battery pack provided in the embodiments of the present application can also be used in electric vehicles.

[0062] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A battery pack with a temperature monitoring function, characterized in that, Comprising: A module bracket, a plurality of battery cells, a wire harness, a heat conduction component, and a temperature sensor; The module bracket is used to fix the plurality of battery cells arranged in sequence; The heat conduction component is fixed to the module bracket, and the heat conduction component is in contact with the surface of each battery cell among the plurality of battery cells for heat conduction; The temperature sensor is in contact with the surface of the heat conduction component to collect the temperature information of the heat conduction component; One end of the wire harness is electrically connected to the temperature sensor, and the other end of the wire harness is used to be connected to a controller to transmit signals between the temperature sensor and the controller.

2. The battery pack with a temperature monitoring function according to claim 1, wherein The heat conduction component includes a heat conduction member and a heat conduction member bracket. The heat conduction member bracket is fixed on the module bracket. The heat conduction member bracket has a receiving cavity. The heat conduction member is disposed in the receiving cavity. The temperature sensor is disposed on the surface of the heat conduction member. The heat conduction member is in contact with the surface of each battery cell among the plurality of battery cells for heat conduction.

3. The battery pack with a temperature monitoring function according to claim 2, wherein The heat conduction member is a heat pipe, or the material of the heat conduction member is graphene.

4. The battery pack with a temperature monitoring function according to claim 2 or 3, characterized in that, The heat conduction component further includes a plurality of first heat conduction pads. The heat conduction member bracket is a tubular structure. The heat conduction member bracket includes a plurality of heat conduction holes arranged along the extending direction of the heat conduction member bracket. The plurality of heat conduction holes are all communicated with the receiving cavity. The opening of each heat conduction hole faces at least one of the battery cells. The plurality of first heat conduction pads are respectively placed in the plurality of heat conduction holes. One end of each first heat conduction pad is in contact with the heat conduction member, and the other end of each first heat conduction pad is in contact with at least one of the battery cells.

5. The battery pack with a temperature monitoring function as described in claim 4, wherein, The plurality of heat conduction holes are arranged in one-to-one correspondence with the plurality of battery cells. One end of each first heat conduction pad is in contact with the heat conduction member, and the other end of each first heat conduction pad is in contact with a corresponding one of the battery cells.

6. The battery pack with a temperature monitoring function according to claim 2 or 3, characterized in that, The heat conduction component further includes a second heat conduction pad. The heat conduction member bracket includes a slot. The opening of the slot faces the plurality of battery cells. The extending direction of the slot is the same as the extending direction of the heat conduction member bracket. The slot is communicated with the receiving cavity. The second heat conduction pad is disposed in the slot. One end of the second heat conduction pad is in contact with the heat conduction member, and the other end of the second heat conduction pad is in contact with the surface of each battery cell among the plurality of battery cells.

7. The battery pack with a temperature monitoring function according to any one of claims 2 to 6, characterized in that The heat conduction member bracket is disposed on the side of the plurality of battery cells. The two ends of the module bracket in the height direction of the battery cell respectively include a first bracket and a second bracket. The heat conduction component includes a plurality of positioning plates. In the height direction of the battery cell, the heat conduction member bracket is located between the first bracket and the second bracket. The plurality of positioning plates are sequentially arranged along the extending direction of the heat conduction member bracket. In the height direction of the battery cell, the positioning plates sequentially connect the first bracket, the heat conduction member bracket, and the second bracket.

8. The battery pack with a temperature monitoring function according to any one of claims 2 to 6, characterized in that, The heat conducting member bracket is arranged on the top surface or side surface of the multiple battery cells, and the module bracket includes a third bracket and a fourth bracket at both ends of the battery cells in the length direction. The heat conducting member bracket is provided with fixing holes at both ends in the extension direction, and the connecting member passes through the fixing holes to fix the two ends of the heat conducting member bracket in the extension direction to the third bracket and the fourth bracket respectively.

9. The battery pack with a temperature monitoring function according to any one of claims 2 to 8, characterized in that The heat-conducting bracket is in a straight line shape; The heat-conducting bracket is arranged on the top surface of the plurality of battery cells, or the heat-conducting bracket is arranged on one side surface of the plurality of battery cells, or there are two heat-conducting brackets, and the two heat-conducting brackets are respectively arranged on two sides of the plurality of battery cells.

10. The battery pack with a temperature monitoring function according to any one of claims 2 to 8, characterized in that, The heat-conducting bracket is U-shaped and is disposed around two side surfaces of the plurality of battery cells.

11. The battery pack with a temperature monitoring function according to any one of claims 2 to 10, characterized in that, The heat conducting member bracket includes a connection hole, the connection hole is located on a side of the heat conducting member bracket away from the battery cell, and the wiring harness is electrically connected to the temperature sensor through the connection hole.

12. An energy storage system, characterized in that, The energy storage system includes a power converter and multiple battery packs with temperature monitoring function as described in any one of claims 1 to 11; the power converter is used to convert the voltage output by the multiple battery packs into power and output it to the power grid or load, or to convert the voltage output by an external power supply into power and output it to the battery pack.

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