Battery module and battery assembly

Abstract

The utility model provides a battery module and a battery assembly, and belongs to the technical field of energy storage batteries, the battery module comprises a box body and a plurality of battery cells linearly arranged in the box body, the box body is filled with a cooling liquid to immerse the battery cells, the cathodes of two adjacent battery cells are connected with each other, the anode of each battery cell is connected with a contactor switch, and the contactor switch is connected with the battery assembly. The box body is also provided with a control panel, and the control panel is electrically connected with the plurality of contactor switches to control the on-off of the contactor switches. The cooling effect of the battery cell can be improved, and meanwhile the safety performance of the system is improved. The cooling effect of the battery cell is improved, and meanwhile the safety performance of the system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage batteries, and in particular to a battery module and a battery assembly. Background Art

[0002] Lithium-ion batteries are widely used in many electronic technologies such as computers and mobile phones, as well as low-speed electric vehicles and passenger cars due to their high energy density, wide operating temperature range, long stable discharge storage time, and long storage and cycle time. The composition of lithium-ion batteries mainly includes four key materials: positive electrode materials, negative electrode materials, electrolytes and diaphragms.

[0003] The rapid development of lithium battery technology has brought about great progress in new energy technology, but the problem of battery thermal runaway has not been overcome. When an abnormal internal short circuit occurs in the battery, the heat energy cannot be released quickly. When the temperature of some battery cells reaches the battery ignition point, it will affect the continued failure of surrounding batteries, causing a chain reaction and even explosion. Utility Model Content

[0004] In view of the technical problems existing in the background technology, the present application provides a battery module and a battery assembly, which can improve the cooling effect of the battery cell and improve the system safety performance.

[0005] The embodiment of the present application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application provides a battery module, including a box body and a plurality of battery cells arranged in a straight line in the box body, the box body is filled with coolant to immerse the battery cells, the negative poles of two adjacent battery cells are connected to each other, the positive pole of each battery cell is connected to a contactor switch, and a control board is also provided on the box body, and the control board is electrically connected to the plurality of contactor switches to control the opening and closing of the contactor switches.

[0007] In the technical solution of the embodiment of the present application, coolant is poured into the box body to immerse the battery cell so as to quickly dissipate the heat of the battery cell, and a contactor switch is connected to the positive electrode of the battery cell. A control board is also provided on the box body. The control board is electrically connected to multiple contactor switches to control the opening and closing of the contactor switches to control the on and off of each battery cell according to the battery cell voltage, thereby improving the cooling effect of the battery cell and improving the safety performance of the system.

[0008] In some embodiments, a temperature sensor is electrically connected to the positive electrode of the battery cell, and the temperature sensor is electrically connected to the control board.

[0009] In this embodiment, the temperature of each battery cell is detected by a temperature sensor to ensure the stability of the battery cell.

[0010] In some embodiments, a fuse is disposed at one end of the contactor switch away from the battery cell.

[0011] In this embodiment, each battery cell is protected by a fuse to prevent damage to one battery cell from causing damage to nearby battery cells.

[0012] In some embodiments, a plurality of overflow ports are arranged at intervals on the box body.

[0013] In this embodiment, an overflow port is provided in the box body to ensure that the liquid level of the coolant in the box body is stable.

[0014] In some embodiments, an insulating connection seat is provided at the bottom of the box body, and the battery module is fixed by the insulating connection seat.

[0015] In this embodiment, the insulation of the battery module during installation is ensured by the insulating connector.

[0016] In some embodiments, mounting grooves are arranged at intervals in the box body, and the mounting grooves are used to fix the battery cells.

[0017] In this embodiment, the battery cell limiter is arranged in the installation groove to ensure that the battery cell is stably positioned in the box body.

[0018] In some embodiments, a liquid inlet and a liquid outlet are provided on the box body, and the liquid inlet and the liquid outlet are used to connect to the circulation system.

[0019] In this embodiment, a circulation system is connected via the liquid inlet and the liquid outlet to circulate and cool the coolant in the box body.

[0020] In some embodiments, two adjacent fuses are electrically connected via a positive conductive strip.

[0021] In this embodiment, two adjacent fuses are electrically connected via a positive electrode conductive strip to achieve electrical connection of the positive electrodes of multiple battery cells.

[0022] In a second aspect, an embodiment of the present application provides a battery assembly, comprising a plurality of battery modules as described above, wherein the battery cells of two adjacent battery modules correspond to each other one by one and are electrically connected to each other.

[0023] In the technical solution of the embodiment of the present application, the battery cells of two adjacent battery modules correspond to each other one by one and are electrically connected to each other, so as to realize the electrical connection of the entire battery assembly.

[0024] In some embodiments, multiple positive electrodes of the battery cells of the battery modules far away from the negative electrodes of the battery cells are connected to each other, and the positive electrodes of the battery cells of the remaining battery modules are connected to the negative electrodes of the battery cells of the adjacent battery modules.

[0025] In this embodiment, a plurality of positive electrodes of the battery cells of the battery module which are far away from the negative electrodes of the battery cells are connected to each other to ensure the stability of the overall electrical connection of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a battery assembly provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a battery module in a battery assembly provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application.

[0030] Explanation of the reference numerals: 1000 - electrical device; 100 - battery assembly; 110 - battery module; 111 - box body; 1111 - overflow port; 1112 - insulating connector; 112 - battery cell; 113 - coolant; 114 - contactor switch; 115 - control board; 116 - temperature sensor; 117 - fuse; 118 - positive electrode conductive strip; 200 - controller; 300 - motor. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] The safety of battery use has always been an issue of concern to people. When an abnormal internal short circuit occurs in the battery, heat energy cannot be released quickly. When the temperature of some battery cells reaches the battery ignition point, it will affect the continued failure of surrounding batteries, causing a chain reaction and even explosion.

[0040] In order to solve the technical problem of safe use of batteries, the present application provides a battery module and a battery assembly, wherein a coolant is poured into a box body to immerse the battery cells so as to quickly dissipate the heat of the battery cells, and a contactor switch is connected to the positive electrode of the battery cell. A control board is also provided on the box body, and the control board is electrically connected to a plurality of contactor switches to control the opening and closing of the contactor switches to control the on and off of each battery cell according to the battery cell voltage, thereby improving the cooling effect of the battery cell and improving the safety performance of the system.

[0041] Please refer to Figure 1 and Figure 2 , is a structural schematic diagram of a battery assembly 100 and a battery module 110 provided in the present application. The battery module 110 includes a box body 111 and a plurality of battery cells 112 arranged in a straight line in the box body 111. The box body 111 is filled with a coolant 113 to immerse the battery cells 112. The negative poles of two adjacent battery cells 112 are connected to each other, and the positive pole of each battery cell 112 is connected to a contactor switch 114. A control board 115 is also provided on the box body 111. The control board 115 is electrically connected to the plurality of contactor switches 114 to control the opening and closing of the contactor switches 114.

[0042] Specifically, when assembling the battery module 110 of the present application, a plurality of battery cells 112 are first placed in sequence in the box body 111, and the plurality of battery cells 112 are arranged linearly. Coolant 113 is poured into the box body 111, and the negative poles of two adjacent battery cells 112 are connected to each other. A contactor switch 114 is connected to the positive pole of each battery cell 112, and then the control board 115 is electrically connected to the contactor switch 114 to complete the assembly of the battery module 110.

[0043] On the one hand, the present application injects coolant 113 into the box body 111, and the coolant 113 directly contacts the battery cell 112. After the battery cell 112 thermally runs away, the coolant 113 is used to directly cool down the battery cell 112 to prevent the thermal runaway from spreading to other surrounding batteries and stop the thermal runaway from spreading.

[0044] On the other hand, a contactor switch 114 is connected to the positive pole of each battery cell 112, and the contactor switch 114 on each battery cell 112 is electrically connected to the control board 115 respectively. The control board 115 detects the voltage of each battery cell 112 and controls the opening and closing of the contactor switch 114 to control the electrical connection between the battery cells 112, so that the control board 115 can cut off each battery cell 112 when an abnormal situation is found, and can also cut off a single battery cell 112 when a single battery cell is abnormal.

[0045] Specifically, the control board 115 is provided with a voltage detection module, a control module and a communication module. The voltage detection module detects the voltage of each battery cell 112 and transmits the detected voltage parameters to the control module through the communication module, so as to control the opening and closing of the electrical connection between the battery cells 112 through the control module.

[0046] It should be noted that a cover is provided on the box body 111 , and the battery cell 112 partially extends out of the cover for circuit connection, and the coolant 113 is isolated by the cover to prevent the coolant 113 from corroding the electrodes of the battery cell 112 .

[0047] Further, in the embodiments of the present application, Figure 1 and Figure 2 As shown, a temperature sensor 116 is electrically connected to the positive electrode of the battery cell 112 , and the temperature sensor 116 is electrically connected to the control board 115 .

[0048] Specifically, a temperature sensor 116 is electrically connected to the positive electrode of the battery cell 112, and the detected temperature information is transmitted to the control board 115 through the temperature sensor 116. The contactor switch 114 is controlled to be on and off through the control board 115. When the temperature of a battery cell 112 is abnormal, the suspicious battery can be cut off individually, and the control board 115 checks the no-load voltage change of the battery to determine whether there is an internal short circuit. The overall battery module 110 can continue to operate.

[0049] Further, in the embodiments of the present application, Figure 1 and Figure 2 As shown, a fuse 117 is disposed at one end of the contactor switch 114 away from the battery cell 112 , and two adjacent fuses 117 are electrically connected via a positive conductive strip 118 .

[0050] Specifically, multiple fuses 117 are electrically connected to each other at one end away from the battery cells 112 to achieve stable electrical connection between the battery cells 112. When an internal short circuit fault point occurs on one of the battery cells 112, the electric energy of other battery cells 112 quickly concentrates on the fault point. The fuse 117 short-circuits to disconnect the electrical connection between the positive poles of two adjacent battery cells 112, so that the electric energy of other battery cells 112 cannot be gathered to the fault point, thereby reducing the maximum released energy of the local short circuit point of the battery module 110 and reducing the maximum failure temperature of the local battery cell 112 of the battery module 110, which can improve the safety performance of the battery module 110.

[0051] Further, in the embodiments of the present application, Figure 1 and Figure 2 As shown, a plurality of overflow ports 1111 are arranged at intervals on the box body 111 .

[0052] Specifically, a plurality of overflow ports 1111 are arranged at intervals on the box body 111, and the heights of the plurality of overflow ports 1111 are consistent. When assembling the battery module 110 of the present application, a plurality of battery cells 112 are first placed in sequence in the box body 111, and the plurality of battery cells 112 are arranged linearly. Coolant 113 is poured into the box body 111. When the liquid level of the coolant 113 is higher than the overflow port 1111, it will flow out from the overflow port 1111, thereby stabilizing the liquid level of the coolant 113 in the box body 111 to avoid a short circuit of the battery cell 112 caused by an excessively high liquid level.

[0053] Further, in the embodiments of the present application, Figure 1 and Figure 2 As shown, an insulating connection seat 1112 is provided at the bottom of the box body 111 , and the battery module 110 is fixed by the insulating connection seat 1112 .

[0054] For example, when installing the battery module 110, the battery module 110 is installed in a preset installation position through an insulating mounting seat to avoid electrical conduction between the battery module 110 and the installation position.

[0055] Further, in the embodiments of the present application, Figure 1 and Figure 2 As shown, mounting grooves are arranged at intervals in the box body 111 , and the mounting grooves are used to fix the battery cells 112 .

[0056] When assembling the battery module 110 of the present application, firstly, a plurality of battery cells 112 are sequentially placed in the box body 111, and the plurality of battery cells 112 are correspondingly placed in a plurality of mounting grooves to ensure that the battery cells 112 do not shake in the mounting grooves, and coolant 113 is poured into the box body 111. When the liquid level of the coolant 113 is higher than the overflow port 1111, it will flow out from the overflow port 1111, thereby stabilizing the liquid level of the coolant 113 in the box body 111 to avoid a short circuit of the battery cells 112 due to an excessively high liquid level, thereby fixing the battery cells 112 in the mounting grooves and ensuring that the battery cells 112 do not tilt and are immersed in the coolant 113.

[0057] Further, in the embodiments of the present application, Figure 1 and Figure 2 As shown, the box body 111 is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are used to connect to the circulation system.

[0058] Specifically, during assembly, the circulation system is connected to the liquid inlet and the liquid outlet, and a certain amount of coolant 113 is injected into the box body 111. The circulation system works so that the coolant 113 in the box body 111 continuously flows out from the liquid outlet and flows into the liquid inlet, and so on, so as to cool the coolant 113 in the box body 111.

[0059] In a second aspect, the embodiment of the present application provides a battery assembly 100, comprising a plurality of battery modules 110 in the aforementioned embodiment, wherein the battery cells 112 of two adjacent battery modules 110 correspond to each other and are electrically connected to each other. The positive electrodes of the multiple battery cells 112 of the battery module 110 away from the negative electrode of the battery cell 112 are connected to each other, and the positive electrodes of the battery cells 112 of the remaining battery modules 110 are connected to the negative electrodes of the battery cells 112 of the adjacent battery modules 110.

[0060] Specifically, when assembling the battery assembly 100 of the present application, the battery module 110 is first assembled, that is, a plurality of battery cells 112 are placed in the box body 111 in sequence, and coolant 113 is poured into the box body 111, and the negative poles of two adjacent battery cells 112 are connected to each other, and a contactor switch 114 is connected to the positive pole of each battery cell 112, and then the control board 115 is electrically connected to the contactor switch 114, and a fuse 117 is set at the positive pole of the battery cell 112 of the battery module 110, and the positive pole of the battery cell 112 of the battery module 110 is connected to the negative pole of the battery cell 112 of the adjacent battery module 110 through the fuse 117, and then the positive poles of the plurality of battery cells 112 of the battery module 110 away from the negative pole of the battery cell 112 are connected to each other to complete the assembly of the battery assembly 100.

[0061] Please also read Figure 1 to Figure 2 According to one or more embodiments of the present application, the battery assembly 100 provided by the present application has a coolant 113 filled into the box body 111 to immerse the battery cell 112 so as to quickly dissipate the heat of the battery cell 112, and a contactor switch 114 is connected to the positive electrode of the battery cell 112. A control board 115 is also provided on the box body 111. The control board 115 is electrically connected to multiple contactor switches 114 to control the opening and closing of the contactor switches 114 to control the on and off of each battery cell 112 according to the voltage of the battery cell 112, thereby improving the cooling effect of the battery cell 112 and improving the safety performance of the system. The temperature of each battery cell 112 is detected by a temperature sensor 116 to ensure the stability of the battery cell 112. Each battery cell 112 is further protected by a fuse 117 to prevent damage to one battery cell 112 from causing damage to the battery cells 112 near the battery cell 112.

[0062] The battery assembly 100 disclosed in the embodiment of the present application can be used in, but not limited to, an electric device 1000 such as a vehicle, a ship, an aircraft, an energy storage system, etc. The power supply system of the electric device 1000 can be composed of the battery assembly 100 disclosed in the present application, which is beneficial to improve the cooling effect of the battery cell 112 and improve the system safety performance.

[0063] The electric device 1000 provided in the embodiment of the present application may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, an energy storage power station, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0064] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of an electric device 1000 provided for some embodiments of the present application. The electric device 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery assembly 100 is arranged inside the electric device 1000, and the battery assembly 100 may be arranged at the bottom, head or tail of the electric device 1000. The battery assembly 100 may be used to power the electric device 1000. For example, the battery assembly 100 may serve as an operating power source for the electric device 1000. The electric device 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery assembly 100 to power the motor 300, for example, to meet the power requirements of the electric device 1000 during startup, navigation and driving.

[0065] In some embodiments of the present application, the battery assembly 100 can not only serve as an operating power source for the electrical device 1000, but also serve as a driving power source for the electrical device 1000, replacing or partially replacing fuel or natural gas to provide driving power for the electrical device 1000.

[0066] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A battery module, characterized in that: It includes a box body and a plurality of battery cells arranged in a straight line in the box body. The box body is filled with coolant to immerse the battery cells. The negative poles of two adjacent battery cells are connected to each other. The positive pole of each battery cell is connected to a contactor switch. A control board is also arranged on the box body. The control board is electrically connected to the plurality of contactor switches to control the opening and closing of the contactor switches.

2. The battery module according to claim 1, characterized in that: A temperature sensor is electrically connected to the positive electrode of the battery cell, and the temperature sensor is electrically connected to the control board.

3. The battery module according to claim 1, characterized in that: A fuse is arranged at one end of the contactor switch away from the battery core.

4. The battery module according to claim 1, characterized in that: The box body is provided with a plurality of overflow ports at intervals.

5. The battery module according to claim 1, characterized in that: An insulating connection seat is provided at the bottom of the box body, and the battery module is fixed by the insulating connection seat.

6. The battery module according to claim 1, characterized in that: The box body is provided with installation grooves at intervals, and the installation grooves are used to fix the battery cores.

7. The battery module according to claim 1, characterized in that: The box body is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are used to connect to a circulation system.

8. The battery module according to claim 3, characterized in that: Two adjacent fuses are electrically connected via a positive conductive strip.

9. A battery assembly, characterized in that: It comprises a plurality of battery modules as claimed in any one of claims 1 to 7, wherein the battery cells of two adjacent battery modules correspond to each other one by one and are electrically connected to each other.

10. The battery assembly according to claim 9, characterized in that: The positive electrodes of multiple cells of the battery modules far away from the negative electrodes of the cells are connected to each other, and the positive electrodes of the cells of the remaining battery modules are connected to the negative electrodes of the cells of the adjacent battery modules.

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