Battery module and electric device

Abstract

The embodiment of the utility model relates to the technical field of batteries, and particularly discloses a battery module and a power utilization device, the battery module comprises a battery pack, the battery pack comprises a plurality of single batteries, and the single batteries are sequentially arranged in a first direction; the circuit board is arranged on one side of the single battery in the second direction, and the circuit board is electrically connected with the single battery; and the temperature sensor is arranged between two adjacent single batteries, and the temperature sensor is electrically connected with the circuit board. According to the invention, the temperature sensor can more accurately collect the temperature information of the single battery, the collection precision of the temperature sensor is improved, it is ensured that the battery module can accurately carry out corresponding early warning operation according to the more accurate temperature information of the single battery collected by the temperature sensor, and the safety performance of the battery module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery module and a power utilization device. BACKGROUND

[0002] Battery packs are widely used in electric vehicles, electric trains, electric bicycles and other vehicles. The batteries in the battery pack are sealed in a box. During operation, the batteries generate a large amount of heat. Therefore, monitoring the temperature of the batteries during the operation of the battery pack is an important step in the driving process of new energy vehicles.

[0003] In existing battery packs, temperature sampling chips are fixed on busbars or on the upper covers of the batteries by nickel sheets. After the temperature sampling chips collect the temperature information of the batteries, the battery management system compensates for the temperature as the true temperature of the batteries. However, the temperature between the large faces of two batteries is the highest. The temperature sampling accuracy of the temperature sampling chips arranged in this way is greatly deviated. The battery management system cannot accurately perform early warning operations, and the safety performance of the battery pack is poor. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a battery module to improve the safety performance of the battery module.

[0005] Another object of the present application is to provide a power utilization device comprising the above battery module.

[0006] To solve the above technical problems, embodiments of the present application disclose the following technical solutions:

[0007] In one aspect, a battery module is provided, having a first direction and a second direction intersecting each other, comprising:

[0008] a battery pack comprising a plurality of single batteries, each single battery being arranged in the first direction in sequence;

[0009] a circuit board disposed on one side of the single batteries in the second direction, and the circuit board being electrically connected with the single batteries; and

[0010] a temperature sensor disposed between two adjacent single batteries, and the temperature sensor being electrically connected with the circuit board.

[0011] In addition to one or more features disclosed above, or as an alternative, the battery module further has a third direction, the first direction, the second direction and the third direction intersecting each other in pairs;

[0012] The single battery has two first outer wall surfaces oppositely arranged in the first direction, two second outer wall surfaces oppositely arranged in the third direction, and two third outer wall surfaces oppositely arranged in the second direction, the first outer wall surfaces having a larger area than the second outer wall surfaces and the third outer wall surfaces;

[0013] The temperature sensor is arranged between two first outer wall surfaces of two adjacent single cells.

[0014] In addition to one or more of the above disclosed features, or alternatively, the circuit board further comprises a main body portion extending along the first direction, the main body portion being arranged on one side of the single cell in the second direction and being electrically connected to the single cell; and

[0015] A first connecting portion is connected to the main body portion, at least a portion of the first connecting portion being arranged between two first outer wall surfaces of two adjacent single cells, and the temperature sensor is mounted on the first connecting portion.

[0016] In addition to one or more of the above disclosed features, or alternatively, the circuit board further comprises a first fixing member, the temperature sensor being mounted on the first connecting portion through the first fixing member.

[0017] In addition to one or more of the above disclosed features, or alternatively, the circuit board further comprises a pressure sensor arranged between two first outer wall surfaces of two adjacent single cells, and the pressure sensor being electrically connected to the circuit board.

[0018] In addition to one or more of the above disclosed features, or alternatively, the circuit board further comprises a second connecting portion connected to the main body portion, at least a portion of the second connecting portion being arranged between two first outer wall surfaces of two adjacent single cells, and the pressure sensor being mounted on the second connecting portion.

[0019] In addition to one or more of the above disclosed features, or alternatively, the circuit board further comprises a second fixing member, the pressure sensor being mounted on the second connecting portion through the second fixing member.

[0020] In addition to one or more of the above disclosed features, or alternatively, the circuit board further comprises a glue-blocking frame arranged between two first outer wall surfaces of two adjacent single cells, and the glue-blocking frame being provided with a first accommodating groove and a second accommodating groove on a side facing the circuit board, the first connecting portion and the temperature sensor being arranged in the first accommodating groove, and the second connecting portion and the pressure sensor being arranged in the second accommodating groove.

[0021] In addition to one or more of the above disclosed features, or alternatively, the circuit board is electrically connected to a battery management system.

[0022] In another aspect, a power-using device is further disclosed, in addition to one or more of the above disclosed features, or alternatively, the power-using device comprises the battery module as claimed in any one of the above, the battery module serving as a power supply for the power-using device.

[0023] One of the above technical solutions has the following advantages or beneficial effects: the temperature sensor is arranged between two adjacent single batteries, so that the temperature sensor can more accurately collect the temperature information of the single battery, improve the collection accuracy of the temperature sensor, ensure that the battery module can accurately perform corresponding warning operations according to the more accurate temperature information of the single battery collected by the temperature sensor, and improve the safety performance of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0024] The technical solutions and other beneficial effects of the present application will become apparent from the following detailed description of specific embodiments of the present application, combined with the accompanying drawings.

[0025] Figure 1 is a three-dimensional structural view of a battery module according to an embodiment of the present application;

[0026] Figure 2 is an exploded schematic view of a battery module according to an embodiment of the present application;

[0027] Figure 3 is a structural view of a single battery, a circuit board, a temperature sensor, and a pressure sensor according to an embodiment of the present application;

[0028] Figure 4 is an exploded schematic view of a single battery, a circuit board, a temperature sensor, and a pressure sensor according to an embodiment of the present application;

[0029] Figure 5 is a structural view of a circuit board, a temperature sensor, and a pressure sensor according to an embodiment of the present application;

[0030] Figure 6 is Figure 5 a partial enlarged view of position A in FIG. 1;

[0031] Figure 7 is Figure 5 a partial enlarged view of position B in FIG. 1.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 100, battery module;

[0034] 110, battery pack; 111, single battery; 1111, first outer wall surface; 1112, second outer wall surface; 1113, third outer wall surface;

[0035] 120, circuit board; 121, main body portion; 122, first connecting portion; 123, second connecting portion;

[0036] 130, temperature sensor;

[0037] 140, pressure sensor;

[0038] 150, glue blocking frame; 151, first accommodating groove; 152, second accommodating groove;

[0039] 161, first fixing member; 162, second fixing member. DETAILED DESCRIPTION

[0040] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described in the specification are only for the purpose of explaining the present application, and are not intended to limit the present application.

[0041] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0044] In order to solve the problem of low temperature acquisition monitoring accuracy in the existing battery pack, in the embodiment of the present application, with reference to Figures 1-2 , the present application provides a battery module 100, which has a first direction X, a second direction Z and a third direction Y intersecting with each other. For example, the battery module 100 has a first direction X, a second direction Z and a third direction Y perpendicular to each other. Wherein, "perpendicular" refers to the state that the angle formed by straight lines, straight lines and planes, or planes is 89°-91°.

[0045] Specifically, with reference to Figures 1-4 , the battery module 100 includes a battery pack 110, a circuit board 120 and a temperature sensor 130.

[0046] Specifically, the battery pack 110 includes a plurality of single batteries 111, each single battery 111 is arranged in sequence in the first direction X; the circuit board 120 is arranged on one side of the single battery 111 in the second direction Z, and the circuit board 120 is electrically connected with the single battery 111; the temperature sensor 130 is arranged between two adjacent single batteries 111, and the temperature sensor 130 is electrically connected with the circuit board 120, and the temperature sensor 130 is used to collect temperature information of the single battery 111.

[0047] Wherein, the single battery 111 can be a secondary battery, which refers to a single battery that can be activated by charging after discharging. For example, the single battery 111 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery or a nickel cadmium battery, but not limited thereto.

[0048] The single battery 111 can be a prismatic battery, a soft package battery or other shaped battery. For example, in the present application, the single battery 111 is a square lithium ion battery.

[0049] The monomer battery 111 comprises a shell, an electrode assembly, an electrolyte, an end cover, a pole and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte added with an additive, and the electrolyte is used for soaking the electrode assembly. The electrode assembly is a component where an electrochemical reaction occurs in the monomer battery 111, and the electrode assembly can be one or more. The electrode assembly is mainly formed by stacking or winding a positive plate, a separator and a negative plate. The positive plate and the negative plate have a part of active material to constitute an electrode body, and the positive plate and the negative plate each have a part without active material to constitute a tab. In the charging and discharging process of the monomer battery 111, the positive active material and the negative active material react with the electrolyte, and the tab is electrically connected with the pole to form a current loop, so that the monomer battery 111 is normally used.

[0050] The circuit board 120 can be a flexible circuit board, but is not limited thereto.

[0051] The temperature sensor 130 can be any one of a temperature sampling chip, a resistance temperature detector and a semiconductor temperature sensor, but is not limited thereto.

[0052] It can be understood that the monomer battery 111 generates heat during normal operation to change the temperature thereof. The temperature sensor 130 is arranged between two adjacent monomer batteries 111 to more accurately collect the temperature information of the monomer battery 111, improve the collection accuracy of the temperature sensor 130, ensure that the battery module 100 can accurately perform a corresponding early warning operation according to the more accurate temperature information of the monomer battery 111 collected by the temperature sensor 130, and improve the safety performance of the battery module 100.

[0053] In some embodiments, referring to Figures 2-4 The monomer battery 111 has two first outer wall surfaces 1111 oppositely arranged in the first direction X, two second outer wall surfaces 1112 oppositely arranged in the third direction Y and two third outer wall surfaces 1113 oppositely arranged in the second direction Z, and the first outer wall surface 1111 has a larger area than the second outer wall surface 1112 and the third outer wall surface 1113. The temperature sensor 130 is arranged between the two first outer wall surfaces 1111 of two adjacent monomer batteries 111.

[0054] The temperature sensor 130 is arranged between the two first outer wall surfaces 1111 of two adjacent monomer batteries 111 to further more accurately collect the temperature information of the monomer battery 111, improve the collection accuracy of the temperature sensor 130, ensure that the battery module 100 can accurately perform a corresponding early warning operation according to the more accurate temperature information of the monomer battery 111 collected by the temperature sensor 130, and improve the safety performance of the battery module 100.

[0055] In some embodiments, referring to Figures 2-5 The circuit board 120 comprises a main body part 121 and a first connecting part 122. The main body part 121 extends along the first direction X and is arranged on one side of the single battery 111 in the second direction Z and is electrically connected with the single battery 111. The first connecting part 122 is connected with the main body part 121, and at least part of the first connecting part 122 is arranged between two first outer wall surfaces 1111 of two adjacent single batteries 111. The temperature sensor 130 is mounted on the first connecting part 122.

[0056] The main body part 121 and the first connecting part 122 can be integrally formed, i.e., the main body part 121 and the first connecting part 122 are in an integrated structure. Alternatively, the main body part 121 and the first connecting part 122 can be separately arranged and fixedly connected. For example, the first connecting part 122 is fixedly connected with the main body part 121 by welding process. In the present application, no specific limitation is made, and the actual situation can be specifically arranged.

[0057] In the present application, the temperature sensor 130 is mounted on the first connecting part 122, which not only ensures the installation of the temperature sensor 130, but also realizes the signal connection between the temperature sensor 130 and the main body part 121 of the circuit board 120 by using the first connecting part 122. Therefore, the temperature information of the single battery 111 monitored by the temperature sensor 130 can be efficiently fed back to the control element to perform corresponding feedback operation, thereby further improving the safety performance of the battery module 100.

[0058] In some embodiments, the temperature sensor 130 can be provided in plurality, and each temperature sensor 130 is arranged between two first outer wall surfaces 1111 of two adjacent single batteries 111, and each temperature sensor 130 is electrically connected with the circuit board 120, thereby further improving the safety performance of the battery module 100.

[0059] In some embodiments, referring to Figures 2-6 The battery module 100 further comprises a first fixing member 161. The temperature sensor 130 is mounted on the first connecting part 122 through the first fixing member 161, so as to ensure the connection fastness between the temperature sensor 130 and the first connecting part 122, prevent the temperature sensor 130 from moving randomly, ensure that the temperature sensor 130 can efficiently and accurately collect the temperature information of the single battery 111, and further improve the collection accuracy of the temperature sensor 130.

[0060] The first fixing member 161 can be an epoxy reinforcing plate, but is not limited thereto.

[0061] In some embodiments, referring to Figures 2-4The battery module 100 further comprises a pressure sensor 140 arranged between the two first outer wall surfaces 1111 of the two adjacent single batteries 111, and the pressure sensor 140 is electrically connected with the circuit board 120.

[0062] The pressure sensor 140 can be one of a piezoresistive pressure sensor, a capacitive pressure sensor, a piezoelectric pressure sensor, or a strain gauge pressure sensor, but is not limited thereto.

[0063] It can be understood that the electrode assembly in the single battery 111 is arranged in the shell of the single battery 111. During the charging and discharging cycle, lithium ions are embedded in the layered material to cause the negative electrode sheet to increase in thickness. At the same time, gas is generated during the formation process of the electrode assembly, causing the electrode assembly to swell and increase in volume. When the electrode assembly swells during use, the swelling surface of the electrode assembly will press the first outer wall surface 1111 of the single battery 111 to exert a pressing force on the first outer wall surface 1111, so that the first outer wall surface 1111 swells and deforms, thereby exerting a swelling force on the pressure sensor 140. The pressure sensor 140 collects the swelling force information of the single battery 111.

[0064] The application sets the pressure sensor 140 between the two first outer wall surfaces 1111 of the two adjacent single batteries 111 to accurately collect the swelling force information of the single battery 111 using the pressure sensor 140. The battery module 100 can use the pressure sensor 140 to monitor the swelling force change of the single battery 111 in real time, so as to evaluate the health status of the single battery 111 and the overall structural reliability of the battery module 100 according to the swelling force information of the single battery 111, and to make corresponding pre-tightening operation, thereby further improving the safety performance of the battery module 100.

[0065] In some embodiments, with reference to Figures 2-7 The circuit board 120 further comprises a second connecting portion 123 connected to the main body portion 121, and at least part of the second connecting portion 123 is arranged between the two first outer wall surfaces 1111 of the two adjacent single batteries 111, and the pressure sensor 140 is mounted on the second connecting portion 123.

[0066] The main body portion 121 and the second connecting portion 123 can be integrally formed, i.e., the main body portion 121 and the second connecting portion 123 are of an integrated structure. Alternatively, the main body portion 121 and the second connecting portion 123 can be separately arranged and fixedly connected. For example, the second connecting portion 123 is fixedly connected to the main body portion 121 by welding process or the like. In the application, no specific limitation is made, and the arrangement can be made according to the actual situation.

[0067] It can be understood that, by installing the pressure sensor 140 on the second connecting portion 123, the signal connection between the pressure sensor 140 and the main body portion 121 of the circuit board 120 is realized by the second connecting portion 123, while ensuring the installation and fixation of the pressure sensor 140, so that the expansion force information of the single battery 111 monitored by the pressure sensor 140 can be efficiently fed back to the control element to perform corresponding feedback operation, thereby further improving the safety performance of the battery module 100.

[0068] In some embodiments, with reference to Figure 5 and Figure 7 , the battery module 100 further comprises a second fixing member 162, the pressure sensor 140 is installed on the second connecting portion 123 through the second fixing member 162, so as to ensure the connection and fixation between the pressure sensor 140 and the second connecting portion 123, prevent the pressure sensor 140 from moving randomly, ensure that the pressure sensor 140 can efficiently and accurately collect the expansion force information of the single battery 111, and further improve the collection accuracy of the pressure sensor 140.

[0069] Specifically, the second fixing member 162 can be an epoxy reinforcing plate, but is not limited thereto.

[0070] In some embodiments, with reference to Figures 2-4 , the battery module 100 further comprises a glue blocking frame 150, which is arranged between the two first outer wall surfaces 1111 of the two adjacent single batteries 111, and the glue blocking frame 150 is provided with a first accommodating groove 151 and a second accommodating groove 152 on the side facing the circuit board 120, the first connecting portion 122 and the temperature sensor 130 are arranged in the first accommodating groove 151, and the second connecting portion 123 and the pressure sensor 140 are arranged in the second accommodating groove 152, so as to reduce the occupied space of the first connecting portion 122, the temperature sensor 130, the second connecting portion 123 and the pressure sensor 140, and ensure the compactness and structural stability of the overall structure of the battery module 100.

[0071] Specifically, the glue blocking frame 150 can be made of flexible material, for example, the glue blocking frame 150 can be made of foam, and the glue blocking frame 150 can also be made of rubber, but is not limited thereto.

[0072] In some embodiments, the first accommodating groove 151 and the second accommodating groove 152 are both filled with heat-conducting structural glue, so as to further realize the limiting and fixation of the first connecting portion 122, the temperature sensor 130, the second connecting portion 123 and the pressure sensor 140.

[0073] In some embodiments, the battery module 100 further comprises a battery management system (BMS), the circuit board 120 is electrically connected with the battery management system, and specifically, the battery management system is electrically connected with the main body 121.

[0074] It can be understood that when the temperature sensor 130 collects the temperature information of the single battery 111, the temperature sensor 130 feeds back the collected temperature information to the battery management system by using the first connecting part 122 and the main body 121, and the battery management system makes corresponding warning operation according to the feedback result after receiving the feedback signal.

[0075] When the pressure sensor 140 collects the expansion force information of the single battery 111, the pressure sensor 140 feeds back the collected expansion force information to the battery management system by using the second connecting part 123 and the main body 121, and the battery management system makes corresponding warning operation according to the feedback result after receiving the feedback signal.

[0076] On the other hand, in the embodiments of the present application, the present application also provides a power utilization device, which comprises the battery module 100 in any of the above embodiments, and the battery module 100 is used as a power supply of the power utilization device.

[0077] The power utilization device can be, but is not limited to, a mobile device (such as a mobile phone, a notebook computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc.

[0078] The above steps are provided only to help understand the method, structure and core idea of the present application. For those skilled in the art of the present technology, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also belong to the scope of protection of the claims of the present application.

Claims

1. A battery module having a first direction and a second direction that intersect, characterized by, The battery module comprises: a battery pack comprising a plurality of single batteries, each of the single batteries being arranged in sequence in the first direction; a circuit board disposed on one side of the single batteries in the second direction, and the circuit board being electrically connected with the single batteries; and a temperature sensor disposed between two adjacent single batteries, and the temperature sensor being electrically connected with the circuit board. The battery module further has a third direction, and the first direction, the second direction and the third direction intersect with each other; 2. The battery module of claim 1, wherein, The single battery has two first outer wall surfaces oppositely arranged in the first direction, two second outer wall surfaces oppositely arranged in the third direction, and two third outer wall surfaces oppositely arranged in the second direction, and the first outer wall surfaces have a larger area than the second outer wall surfaces and the third outer wall surfaces; The temperature sensor is disposed between two first outer wall surfaces of two adjacent single batteries. The circuit board comprises: a main body portion extending along the first direction, and the main body portion being disposed on one side of the single batteries in the second direction, and the main body portion being electrically connected with the single batteries; and 3. The battery module of claim 2, wherein, a first connecting portion connected to the main body portion, and at least part of the first connecting portion being disposed between two first outer wall surfaces of two adjacent single batteries, and the temperature sensor being mounted on the first connecting portion. Further comprising:

4. The battery module of claim 3, wherein, a first fixing member, and the temperature sensor being mounted on the first connecting portion through the first fixing member. Further comprising:

5. The battery module of claim 3, wherein, a pressure sensor disposed between two first outer wall surfaces of two adjacent single batteries, and the pressure sensor being electrically connected with the circuit board. The circuit board further comprises: a second connecting portion connected to the main body portion, and at least part of the second connecting portion being disposed between two first outer wall surfaces of two adjacent single batteries, and the pressure sensor being mounted on the second connecting portion.

6. The battery module of claim 5, wherein, Further comprising:

7. The battery module of claim 6, wherein, a second fixing member, and the pressure sensor being mounted on the second connecting portion through the second fixing member. Further comprising:

8. The battery module of claim 6, wherein, a glue-blocking frame disposed between two first outer wall surfaces of two adjacent single batteries, and a first accommodating groove and a second accommodating groove being formed on one side of the glue-blocking frame facing the circuit board, the first connecting portion and the temperature sensor being disposed in the first accommodating groove, and the second connecting portion and the pressure sensor being disposed in the second accommodating groove. Further comprising:

9. The battery module of claim 1, wherein, a battery management system, and the circuit board being electrically connected with the battery management system. The battery module comprises:

10. An electrical device, characterized by the battery module as claimed in any one of claims 1 to 9, the battery module being used as a power supply for the electric device. ​

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