Self-heating battery module

Abstract

The invention provides a self-heating battery module, which comprises a plurality of battery core bodies, each battery core body is provided with a heating sheet, and one end of each battery core body is respectively provided with a positive pole lug, a negative pole lug, a positive heating pole lug and a negative heating pole lug; the inner shell is provided with an upper end opening, the inner shell is provided with a plurality of separated spaces, and each separated space is used for accommodating one battery core body; the upper cover is positioned at the upper end opening of the inner shell and is provided with a plurality of accommodating grooves for accommodating the positive pole lug, the negative pole lug, the positive heating pole lug and the negative heating pole lug; the battery also comprises a PCB (Printed Circuit Board) assembly for electrically connecting the battery core bodies, and the PCB assembly comprises a positive pole and a negative pole. The self-heating battery module provided by the invention has the advantages of small volume, fast heating and excellent performance in a low-temperature environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a self-heating battery module. BACKGROUND

[0002] With the continuous development of new energy electric vehicles, new energy electric vehicles are developing towards lightweight and small size, and at the same time, it is required to achieve rapid heating in low temperature environment to achieve the optimal performance of the battery. However, the current traditional battery module is generally stacked by multiple finished battery cells and external structural parts, and each of the multiple battery cells needs to have a separate shell, and a battery module has multiple shells, which is easy to cause the battery module to have a large volume. Moreover, since the battery module needs to be connected by multiple external structural parts, the problem of large volume and high weight of the battery module is further aggravated. In order to achieve the use of the battery module in low temperature environment to achieve better performance, the existing battery module generally adheres a heating film on the outside of the battery cell shell or integrates a PTC heater on the side plate of the battery cell module to achieve the heating function of the battery cell. However, the heating speed and efficiency of the PI heating film and the PTC heater are low in low temperature environment. Therefore, in order to solve the technical problems of large volume, slow heating and low performance in low temperature environment of the battery module in the prior art, a new battery module with small volume, fast heating and high performance in low temperature environment is needed. SUMMARY

[0003] The technical purpose of the present application is to provide a battery module with small volume, fast heating and excellent performance in low temperature environment. In order to achieve the above purpose, the present application provides a self-heating battery module, which comprises: a plurality of battery cores, each battery core having a heating sheet, and one end of each battery core being provided with a positive electrode lug, a negative electrode lug, a positive heating lug and a negative heating lug; an inner shell having an upper end opening, the inner shell having a plurality of partition spaces, each partition space being used for accommodating one battery core; an upper cover located at the upper end opening of the inner shell and having a plurality of accommodation grooves for accommodating the positive electrode lug, the negative electrode lug, the positive heating lug and the negative heating lug; and a PCB circuit board assembly electrically connecting the battery cores, the PCB circuit board assembly comprising a positive electrode column and a negative electrode column.

[0004] Further, the PCB circuit board assembly is further provided with a MOS switch, which can control the connection of the positive heating lug and the negative heating lug.

[0005] Further, the PCB circuit board assembly is further provided with a plurality of connection rows, which can connect the positive electrode lug and the negative electrode lug of each battery core.

[0006] Further, the PCB circuit board assembly is further provided with a positioning hole, and the upper cover is provided with a positioning protrusion which can be inserted into the positioning hole.

[0007] Further, the upper cover is further provided with a liquid injection hole, and electrolyte can be injected into the battery core through the liquid injection hole.

[0008] Further, the upper cover is provided with a plurality of positive pole lug accommodating grooves and a plurality of negative pole lug accommodating grooves, and the liquid injection hole is located between the positive pole lug accommodating grooves and the negative pole lug accommodating grooves in the left-right direction.

[0009] Further, the plurality of positive pole lug accommodating grooves are arranged side by side in the front-rear direction.

[0010] Further, a bracket is further included, and the PCB circuit board assembly is located between the bracket and the upper cover in the up-down direction.

[0011] Further, a top cover is further included, and the positive pole column and the negative pole column on the PCB circuit board assembly can pass through the top cover.

[0012] Further, an outer shell is further included, the inner shell is installed in the outer shell, and the top cover is used for covering the outer shell.

[0013] The self-heating battery module has the technical effects of small volume, light mass, low cost, and fast heating of the battery core in a low-temperature environment, and good performance of the battery in a low-temperature environment The shell in the battery module can accommodate a plurality of battery cores at the same time, the base simplifies the connection mode of the battery module, is highly integrated, and has higher connection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole schematic view of the battery module of the self-heating battery core of the present application. Figure 2 It is an exploded schematic view of the battery module of the self-heating battery core of the present application. Figure 3 It is a schematic view of the inner shell in the battery module of the self-heating battery core of the present application. Figure 4 It is a schematic view of the battery core in the battery module of the self-heating battery core of the present application. Figure 5 It is a structural schematic view of the upper cover in the battery module of the self-heating battery core of the present application. Figure 6 It is a structural schematic view of the PCB circuit board in the battery module of the self-heating battery core of the present application. DETAILED DESCRIPTION

[0015] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended for illustration and explanation of the present application, and are not intended to limit the present application.

[0016] For the convenience of description of the direction, the mounting direction of the battery module is defined as the up-down direction, the axial direction of the battery core is positioned as the left-right direction, and the third direction perpendicular to the up-down direction and the left-right direction is positioned as the front-rear direction.

[0017] As shown in Figure 1-2 The self-heating battery module of the present application comprises a plurality of battery cores 30, an inner shell 20 capable of mounting the plurality of cores 30, an outer shell 10 arranged outside the inner shell 20, an upper cover 40 arranged on the upper end of the battery core 30, a PCB circuit board assembly 50 arranged above the upper cover 40, and a bracket 60 and a top cover 70 sealing the opening of the upper cover 40. The detailed structure of the self-heating battery module of the present application will be described below with reference to the accompanying drawings. Figure 1-6 The detailed structure of the self-heating battery module of the present application is described in detail.

[0018] The self-heating battery module of the present application comprises a plurality of battery cores 30, an inner shell 20 capable of mounting the plurality of cores 30, an outer shell 10 arranged outside the inner shell 20, an upper cover 40 arranged on the upper end of the battery core 30, a PCB circuit board assembly 50 arranged above the upper cover 40, and a bracket 60 and a top cover 70 sealing the opening of the upper cover 40. The detailed structure of the self-heating battery module of the present application will be described below with reference to the accompanying drawings.

[0019] The inner shell 20 is preferably made of plastic and has a shape of a rectangular parallelepiped with an open upper end, and is internally provided with a plurality of partition spaces 201, each of which can accommodate one battery core 30. Thus, the inner shell 20 physically separates the battery cores 30, and each battery core 30 can operate independently without interfering with each other. Compared with the prior art in which each battery core needs to be packaged in a separate aluminum shell, the assembly process of the battery core is greatly simplified, and the production cost of the battery core is saved.

[0020] The upper cover 40, preferably made of plastic, is generally rectangular in shape and covers the upper end opening of the inner shell 20. The upper cover 40 is provided with a positive electrode tab accommodating groove 401, a negative electrode tab accommodating groove 402, a positive heating electrode tab accommodating groove 403, and a negative heating electrode tab accommodating groove 404. Further, in the left-right direction, the positive heating electrode tab groove 403 and the negative heating electrode tab groove 404 are arranged between the positive electrode tab accommodating groove 401 and the negative electrode tab accommodating groove 402. In the front-rear direction, the positive electrode tab accommodating groove 401 is provided with four grooves arranged side by side; the negative electrode tab accommodating groove 402 is also provided with four grooves arranged side by side. Further, in the left-right direction, four liquid injection holes 405 are arranged at the middle part of the upper cover 40, each corresponding to a respective partitioned space 201 in the inner shell 20, so that when each battery core 30 is installed in the partitioned space 201 of the inner shell 20, electrolyte can be injected into each partitioned space 201 through the liquid injection hole 405, thereby achieving the injection of electrolyte into multiple battery cores 30 in the battery module at one time, without the need for individual injection of each battery core, and the efficiency of electrolyte injection is higher compared to conventional battery modules. The upper cover 40 of the present application is also provided with positioning protrusions 406, which are arranged at the two ends of the upper cover 40, respectively. Optionally, the positioning protrusions 406 can also be provided with four, for example, two positioning protrusions are arranged at each end of the upper cover, or two positioning protrusions are arranged at the middle of the upper cover.

[0021] The PCB circuit board assembly 50 is composed of a printed circuit board as a whole, and a plurality of components can be provided on the PCB circuit board assembly according to the structure and function of the battery module. In the present application, the PCB circuit board is configured in a rectangular shape, and the size is adapted to the upper cover 40 of the battery core. Specifically, a plurality of notches are provided thereon, and the plurality of notches correspond to the positive electrode lug accommodating groove 401, the negative electrode lug accommodating groove 402, the positive heating lug accommodating groove 403, and the negative heating lug accommodating groove 404 on the upper cover, so that the positive electrode lug 301, the negative electrode lug 302, the positive heating lug 303, and the negative heating lug 304 of the battery core pass through the PCB circuit board assembly. The PCB circuit board assembly is further provided with a positive electrode lug connecting row 5011, a negative electrode lug connecting row 5021, a positive heating lug connecting row 503, and a negative heating lug connecting row 504. The positive electrode lug 301, the negative electrode lug 302, the positive heating lug 303, and the negative heating lug 304 on the battery monomer can pass through the corresponding notches on the PCB circuit board 50 and be connected to the positive electrode lug connecting row 5011, the negative electrode lug connecting row 5021, the positive heating lug connecting row 503, and the negative heating lug connecting row 504. Preferably, the four electrode lugs on the battery monomer are connected to the corresponding connecting rows by welding. However, the connection mode of each connecting row to the battery monomer 30 can be series connection or parallel connection. The PCB circuit board assembly 50 of the present application is further provided with a MOS switch 505, which can be controlled by the BMS control system (not shown) in the battery module to control the connection or disconnection of the positive heating lug 303 and the negative heating lug 304 on the heating sheet 305 of the battery core. In the present application, the MOS switch can be provided with four, and each MOS switch separately controls the heating or disconnection of the heating sheet 305 in a single battery core 30. The PCB circuit board assembly 50 is further provided with positioning holes 506, which are respectively arranged at the two axial ends of the PCB circuit board assembly. The size of the positioning hole 506 corresponds to the positioning protrusion 406 of the upper cover 40, so that the PCB circuit board assembly 50 and the upper cover 40 can be more accurately aligned and connected, and the phenomenon of misalignment due to inaccurate positioning during assembly can be avoided. The positive pole 501 and the negative pole 502 are integrally provided on the PCB circuit board. The positive pole 501 is arranged at the left end of the battery module and near the positive electrode lug 301 of each battery monomer to connect the positive electrode lug 301 of each battery core to realize series and parallel connection of the positive electrode lug 301 of the battery core. The negative pole 502 is arranged at the right end of the battery module and near the negative electrode lug 302 of each battery core. The positive pole 501 and the negative pole 502 on the PCB circuit board can be connected to the power supply or circuit of the external member of the battery module to realize power transmission between the battery module and the external member. Furthermore, temperature and pressure collecting sheets can be assembled on the PCB circuit board assembly to monitor the temperature and pressure of each battery core in real time and feed back the relevant information.The PCB circuit board assembly of the present invention is highly integrated with MOS tubes, connecting bars, positive poles, negative poles, temperature acquisition pieces, and pressure acquisition pieces, with high integration and small size.

[0022] Bracket 60 is formed in a generally rectangular shape, adapted to the shape of the PCB assembly. Specifically, bracket 60 is formed with a positive electrode post receiving hole and a negative electrode post receiving hole to accommodate the positive electrode post 501 and the negative electrode post 502 of the PCB assembly when the battery module is assembled. In the present invention, bracket 60 is constructed of an insulating resin material to insulate the top cover 70 from the positive electrode post 501 and the negative electrode post 502 of the PCB assembly and protect the various components of the PCB assembly from external interference. In the present invention, the PCB assembly is clamped by the top cover 40 and bracket 60, providing good protection.

[0023] The top cover 70 is formed in a substantially rectangular shape and is configured to adapt to the shape of the bracket 60. The top cover 70 is preferably made of aluminum and configured to entirely cover the opening of the housing to accommodate and seal the battery cell in the housing.

[0024] The following describes in detail the assembly steps of the battery module of the present invention with reference to the accompanying drawings: S1: Place each battery core 30 in each independent separated space 201 in the inner shell 20 along the up and down direction, and then install the upper cover 40 to the opening of the inner shell 20. During the installation process, the positive electrode tab 301, the negative electrode tab 302, the positive heating tab 303, and the negative heating tab 304 of the battery core are respectively passed through the positive tab receiving groove 401, the negative tab receiving groove 402, the positive heating tab groove 403, and the negative heating tab groove 404 in the upper cover 40. The shell 20 forms a tight fit, and glue is set between the upper cover 40 and the inner shell 20 to seal the gap between the upper cover 40 and the inner shell 20, so that the battery core 30 is sealed in each independent space of the inner shell 20, and then the assembled inner shell 20, battery core 30 and upper cover 20 components are installed together in the outer shell 10, and finally the electrolyte is injected into the each separated space 201 in the inner shell 20 through the injection hole 405 to inject the electrolyte into each battery core 30 respectively.

[0025] S2: install the PCB circuit board assembly into the assembly assembled in step S1, during the installation process, the positioning protrusion 406 in the upper cover 40 is matched with the positioning hole 506 in the PCB circuit board assembly, at the same time, the positive pole lug 301, the negative pole lug 302, the positive heating pole lug 303 and the negative heating pole lug 304 of the battery core 30 pass through the corresponding accommodating slot on the PCB circuit board assembly; then the respective connection rows on the PCB circuit board assembly 50 are connected together by welding, so that the respective battery cores 30 are connected in series and parallel through the PCB circuit board assembly, at the same time, the MOS tube is connected with the positive heating pole lug 303 and the negative heating pole lug 304 of the battery core 30 to control the on-off of the heating sheet.

[0026] S3: install the support 60 above the PCB circuit board assembly in step S2, so that the positive pole column 501 arranged on the PCB circuit board assembly passes through the positive pole penetrating hole (not shown) of the support 60, and the negative pole column 502 passes through the negative pole penetrating hole (not shown) of the support 60.

[0027] S4: assemble the top cover 70 into the assembly obtained in step S3, the positive pole column 501 and the negative pole column 502 pass through the top cover 70, and the top cover 70 is sealingly connected with the shell.

[0028] The plurality of battery cores in the battery module of the application are directly packaged in one shell, which is different from the prior art in which each battery core needs a shell for sealing, so that the number of core shells can be reduced and space can be saved. Thus, the battery cores are directly connected in series and parallel inside the battery module shell and are formed by liquid injection, without the need for multiple aluminum plastic films and other external structures, the process steps for manufacturing the self-heating battery core module are reduced, the lightweight and small size of the battery module are realized, and the functional requirements of the battery core for the electric vehicle are better met.

[0029] The battery module of the present application has a heating sheet in each battery core, which is in direct contact with or close to the pole piece of the battery core, and can quickly conduct heat to the pole piece after being heated by electricity, thus achieving high heat conduction efficiency, and realizing fast heating of the battery core in a low temperature environment, so that the battery has good performance in a low temperature environment. Moreover, in order to accurately control the operation of the heating sheet in the core, the heating sheet is provided with a positive heating tab and a negative heating tab, and the disconnection and connection of the positive heating tab and the negative heating tab are controlled by a MOS switch, so that when the temperature of the battery module reaches a predetermined low temperature, the MOS switch is opened to realize the connection of the positive heating tab and the negative heating tab, and when the temperature of the core reaches a predetermined temperature, the MOS switch is disconnected, the positive heating tab and the negative heating tab are disconnected, and the heating sheet stops heating, so that the temperature of the core does not continue to rise and is kept at a certain stable state, and the performance of the battery core is maintained at a relatively stable level. Therefore, the battery module of the present application can realize self-heating function in a low temperature environment and quickly improve the performance of the battery.

[0030] In the battery module of the present application, the MOS tube, temperature acquisition sheet, series-parallel connection connection row and other important parts are integrally integrated on the PCB circuit board assembly, and can be directly connected with the positive and negative tabs of the battery core, thus simplifying the connection mode of the battery module and achieving high integration and high connection efficiency.

[0031] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A self-heating battery module, comprising: a plurality of battery cells, each of the battery cells having a heating sheet, and each of the battery cells having a positive tab, a negative tab, a positive heating tab, and a negative heating tab at one end thereof; an inner case having an upper opening, the inner case having a plurality of partitioned spaces, each of the partitioned spaces being configured to accommodate one of the battery cells; an upper cover located at the upper opening of the inner case, the upper cover having a plurality of accommodation grooves configured to accommodate the positive tab, the negative tab, the positive heating tab, and the negative heating tab; and 2. The self-heating battery module of claim 1, wherein, a PCB assembly electrically connecting the battery cells, the PCB assembly having a positive post and a negative post.

3. The self-heating battery module of claim 1, wherein, The PCB assembly further has a MOS switch configured to control connection between the positive heating tab and the negative heating tab.

4. The self-heating battery module of claim 1, wherein, The PCB assembly further has a plurality of connection rows configured to connect the positive tab and the negative tab of each of the battery cells.

5. The self-heating battery module of claim 1, wherein, The PCB assembly further has a positioning hole, and the upper cover has a positioning protrusion configured to be inserted into the positioning hole.

6. The self-heating battery module of claim 5, wherein the heating element is a wire. The upper cover further has a liquid injection hole configured to inject electrolyte into each of the battery cells.

7. The self-heating battery module of claim 6, wherein the heating element is a wire wound around the battery. The upper cover has a plurality of positive tab accommodation grooves and a plurality of negative tab accommodation grooves, and the liquid injection hole is located between the positive tab accommodation grooves and the negative tab accommodation grooves in a left-right direction.

8. The self-heating battery module of claim 1, wherein, The plurality of positive tab accommodation grooves are arranged side by side in a front-rear direction.

9. The self-heating battery module of claim 1, wherein, The PCB assembly is located between a bracket and the upper cover in an up-down direction.

10. The self-heating battery module of claim 1, wherein, The PCB assembly further has a top cover, and the positive post and the negative post of the PCB assembly pass through the top cover. The inner case is installed in an outer case, and the top cover is configured to cover the outer case.

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