Battery module, battery pack and assembling method thereof

Abstract

The invention provides a battery module, a battery pack and an assembling method thereof, and the battery module comprises a bottom support which comprises a plurality of rows and columns of battery cell accommodating grooves, each battery cell accommodating groove comprises side walls, and a top opening and a bottom opening which are enclosed by the side walls; the heating film comprises a plurality of heating parts, the heating film is arranged on the side, where the bottom openings are located, of the bottom support, and one heating part of the heating film is correspondingly located at one bottom opening; the battery cell unit comprises multiple rows and columns of battery cells, one battery cell is contained in one battery cell containing groove, and the first end of the battery cell abuts against the heating part located at the bottom opening.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, and in particular to a battery module, a battery pack and an assembling method thereof. BACKGROUND

[0002] The core operating mechanism of an electrochemical energy storage system involves configuring a plurality of battery cells in series and parallel, using series connection to increase the output voltage of the system, and using parallel connection to increase the energy storage capacity of the system, so as to adapt to diversified power application scenarios and load requirements. This energy storage configuration optimizes the efficiency of electrical energy management and improves the flexibility and reliability of energy utilization.

[0003] Generally, an energy storage battery pack is formed by battery modules connected in series and parallel, and the battery modules are formed by battery cells connected in series and parallel, that is, a single battery cell is the smallest energy storage unit of the energy storage battery pack. As can be seen, the single battery cell is also an internal core component of the energy storage battery pack, which converts chemical energy into electrical energy or converts electrical energy into chemical energy for storage through chemical reaction. Therefore, the performance of the single battery cell directly affects the key parameters of the energy storage battery pack, such as capacity, voltage, charging and discharging speed, and service life.

[0004] In actual application, the energy storage battery pack may be applied in various extreme environments, and its performance faces many challenges. For example, when the energy storage battery pack is in an extremely low temperature environment (such as -20℃ to -25℃), directly charging it will cause many problems such as lithium dendrite precipitation, low charging efficiency, irreversible decay of battery capacity, and even internal short circuit of the battery, and even explosion, causing serious safety hazards; directly discharging it will also cause problems such as significant decrease in discharge capacity, decrease in discharge efficiency, decrease in battery life, and decrease in safety.

[0005] Therefore, in an extremely low temperature environment, the battery cells in the energy storage battery pack need to be preheated before discharging or charging to raise their temperature to a safe working range, such as above zero degrees.

[0006] A commonly used heating method at present is external heat source heating, such as converting electrical energy into heat energy by an electric heating wire or a heating film to transfer the heat energy to the battery cells for heating.

[0007] Specifically, the electric heating wire or the heating film can be fixed on the surface of the battery cell body, the first end of the battery cell, or the second end opposite to the first end. Generally, one of the first end or the second end of the battery cell is an electrode end, which is used to set the positive and negative terminals of the battery cell, and can be referred to as the top, and the other is used to set the explosion-proof port, and can be referred to as the bottom, but the present application is not limited thereto, and the positive and negative terminals of the battery cell and the explosion-proof port can also be set on the same end of the battery cell. In order to improve the heating efficiency, the electric heating wire or the heating film needs to have good thermal contact with the battery cell.

[0008] To this end, when the heating wire or heating film is fixed on the surface of the battery body, a heat-conducting adhesive needs to be used to make the heating wire or heating film in physical contact with the battery body. Similarly, when the heating wire or heating film is fixed on the top and bottom of the battery, a heat-conducting adhesive also needs to be used to make the heating wire or heating film in physical contact with the top or bottom of the battery, and at this time, the explosion-proof port or electrode also needs to be avoided, which leads to a complex glue-filling process and high cost, and the physical contact formed by the heat-conducting adhesive also leads to a long heat-conducting path and low heat-conducting efficiency.

[0009] When a short circuit, overcharge or other abnormal conditions occur inside the battery, a large amount of gas may be generated inside the battery, causing the internal pressure of the battery to rise sharply. In order to meet the UL certification standard, an explosion-proof port (also known as a safety valve or pressure relief valve) needs to be provided on the top and / or bottom of the battery, and a corresponding explosion-proof channel is also reserved to release the internal pressure, which is a very important and necessary safety feature in battery design. The explosion-proof port can automatically open when the pressure reaches a certain threshold to release the internal pressure, thereby avoiding the explosion of the battery, so the heat-conducting adhesive needs to avoid the explosion-proof port and the explosion-proof channel.

[0010] Therefore, the current battery heating method has the problems of low heating efficiency, high cost and complex process. SUMMARY

[0011] According to one embodiment, the present application provides a battery module, comprising: a bottom support comprising a plurality of rows and columns of battery accommodating grooves, each of the battery accommodating grooves comprising a side wall and a top opening and a bottom opening surrounded by the side wall; a heating film comprising a plurality of heating portions, wherein the heating film is arranged on the side where the bottom opening of the bottom support is located, and one of the heating portions of the heating film is located at one of the bottom openings; and a battery unit comprising a plurality of rows and columns of batteries, one of the batteries being accommodated in one of the battery accommodating grooves, and a first end of the battery abutting against the heating portion located at the bottom opening.

[0012] Further, the battery module is arranged in a shell, the shell comprising a shell bottom plate, the bottom support being fixed to the shell bottom plate, and the heating film being located between the bottom support and the shell bottom plate.

[0013] Further, in the direction of gravity, the battery unit is located above the bottom support, and the bottom support is located above the heating film, wherein the side close to the shell bottom plate is referred to as "down" or "bottom", and the opposite side is referred to as "up" or "top".

[0014] Further, at least a part of the bottom opening of the bottom support is also defined as a heating port.

[0015] Further, the heating portion is matched with the shape of the heating port, and one heating portion is embedded into one heating port.

[0016] Further, the heating port and the heating portion are semi-circular structure, ring structure or circular structure.

[0017] Further, at least part of the bottom opening of the bottom support is also defined as an explosion-proof passage port.

[0018] Further, the heating portion directly contacts part of the first end of the battery cell, and the explosion-proof passage port is arranged corresponding to the explosion-proof port of the battery cell.

[0019] Further, an epoxy plate is further included, and the heating film is fixed on the epoxy plate.

[0020] The application further provides a battery pack, which comprises at least one battery module and a shell, and a plurality of battery modules are arranged on the bottom plate of the shell.

[0021] The application further provides an assembling method of a battery pack, which comprises the following steps: providing a shell, wherein the shell comprises a shell bottom plate; providing at least one heating film, wherein the heating film comprises a plurality of heating portions; providing at least one epoxy plate, wherein one heating film is fixed on at least one epoxy plate to form at least one heating assembly; providing a bottom support, wherein the bottom support comprises a plurality of rows and columns of battery cell accommodation grooves, each battery cell accommodation groove comprises a side wall and a top opening and a bottom opening formed by the side wall; clamping the heating assembly on one side of the bottom opening of the bottom support, and one heating portion of the heating film is embedded into one bottom opening; and providing a battery cell unit, wherein the battery cell unit comprises a plurality of rows and columns of battery cells, each battery cell in the battery cell unit is arranged in one battery cell accommodation groove through the top opening of one battery cell accommodation groove, and the first end of the battery cell abuts against the heating portion located in the bottom opening, wherein the direction of the column in which the heating portions are arranged in the heating film is consistent with the direction of the column of the battery cell accommodation grooves in the bottom support, and the direction of the row in which the heating portions are arranged is consistent with the direction of the row of the battery cell accommodation grooves.

[0022] Further, the clamping of the heating assembly on one side of the bottom opening of the bottom support comprises the following steps: a support plate is further formed on one side of the bottom opening of the bottom support, at least one protrusion is formed on the support plate, at least one positioning hole is included on the epoxy plate, the positioning hole on the epoxy plate is aligned with the protrusion on the support plate, the protrusion is correspondingly clamped into the positioning hole, and the side wall of the heating film is clamped with the side wall of the support plate, so that one heating portion of the heating film is correspondingly embedded into one bottom opening.

[0023] Further, the bottom opening side of the bottom support is further formed with a spacing channel, the bottom opening is spaced by the spacing channel into a heating port and an explosion-proof passage port, when the positioning hole on the epoxy plate is aligned with the protrusion on the support plate and the protrusion is correspondingly clamped in the positioning hole, the side wall of the heating film is further clamped with the side wall of the spacing channel, so that one heating part of the heating film is correspondingly embedded in one heating port.

[0024] Further, when each battery cell in the battery cell unit is correspondingly placed in one battery cell accommodation groove through the top opening of the battery cell accommodation groove, the explosion-proof port of one battery cell corresponds to one explosion-proof passage port.

[0025] The foregoing has outlined rather broadly the features and technical advantages of the present disclosure so that fair understanding of the detailed description of the disclosure that follows. Additional features and advantages of the present disclosure will be described below, which form the subject matter of the claims of the present disclosure. Those skilled in the art should understand that the disclosed concepts and specific embodiments can be easily used as a basis for modifying or designing other structures or processes for achieving the same purpose of the present disclosure. Those skilled in the art should also realize that such equivalent structures do not depart from the spirit and scope of the present disclosure set forth in the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more fully understand the present disclosure and its advantages, reference is made to the following description taken together with the accompanying drawings, in which:

[0027] Figure 1 A bottom view schematic diagram of a battery module of an embodiment of the present application is shown;

[0028] Figure 2 An explosion schematic diagram of a battery module of an embodiment of the present application is shown;

[0029] Figure 3 A structure schematic diagram of a heating film of an embodiment of the present application is shown;

[0030] Figure 4 A schematic diagram of a battery module placed in a shell of an embodiment of the present application is shown;

[0031] Figure 5 An explosion schematic diagram of an energy storage battery pack of an embodiment of the present application is shown;

[0032] Figure 6 A schematic diagram of a bottom support of an embodiment of the present application is shown from the perspective of the top opening side thereof;

[0033] Figure 7 A schematic diagram of a bottom support of an embodiment of the present application is shown from the perspective of the bottom opening side thereof;

[0034] Figure 8A structural diagram showing the heating film fixed on the epoxy plate according to an embodiment of the present application is shown in FIG. 1;

[0035] Figure 9 An exploded diagram showing the heating film and the epoxy plate according to an embodiment of the present application is shown in FIG. 2;

[0036] Figure 10 A bottom perspective view diagram of a battery module according to another embodiment of the present application is shown in FIG. 3;

[0037] Figure 11 A bottom perspective view diagram of a battery module according to another embodiment of the present application is shown in FIG. 4;

[0038] Figure 12 A structural diagram showing the heating film fixed on the epoxy plate according to another embodiment of the present application is shown in FIG. 5;

[0039] Figure 13 A bottom perspective view diagram of a battery module according to another embodiment of the present application is shown in FIG. 6;

[0040] Figure 14 A structural diagram showing the heating film fixed on the epoxy plate according to another embodiment of the present application is shown in FIG. 7.

[0041] Unless otherwise indicated, corresponding numbers and symbols in different drawings generally refer to corresponding parts. These drawings are drawn to clearly illustrate relevant aspects of various embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION

[0042] The technical solutions in the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] Specifically, please refer to Figure 1 A bottom perspective view diagram of a battery module according to an embodiment of the present application is shown in FIG. 1, Figure 2 An exploded diagram of a battery module according to an embodiment of the present application is shown in FIG. 2, Figure 3 A structural diagram of a heating film according to an embodiment of the present application is shown in FIG. 3. The battery module proposed in the present application includes:

[0044] The bottom support 1 includes a plurality of rows and columns of cell accommodating grooves 11. Each cell accommodating groove 11 includes a side wall 111 and a top opening 112 and a bottom opening 113 formed by the side wall 111;

[0045] The heating film 2 comprises a plurality of heating portions 21, wherein the heating film 2 is arranged on one side of the bottom opening 113 of the bottom support 1, and one heating portion 21 of the heating film 2 corresponds to one bottom opening 113;

[0046] The electric core unit 3 comprises a plurality of rows and columns of electric cores 31, one electric core 31 is arranged in one electric core accommodating groove 11, and the first end 311 of the electric core 31 abuts against the heating portion 21 located at the bottom opening 113.

[0047] Further, referring to Figure 4 a schematic view of the battery module of one embodiment of the application arranged in a shell, and Figure 5 a schematic view of the explosion of the energy storage battery pack of one embodiment of the application, as Figure 4 and Figure 5 As shown, in actual application or in the conventional arrangement state of the battery module, in the direction of gravity, the battery module 10 formed by the electric core unit 3, the bottom support 1 and the heating film 2 is arranged on the shell bottom plate 201 in the shell 20, specifically, the electric core unit 3 is located above the bottom support 1, the bottom support 1 is located above the heating film 2, and the heating film 2 is located above the shell bottom plate 201, which can also be called that the shell bottom plate 201 is located below the heating film 2, the heating film 2 is located below the bottom support 1, and the bottom support 1 is located below the electric core unit 3. That is, in the present application, the side close to the shell bottom plate 201 is called "lower" or "bottom", and the opposite side is called "upper" or "top", and therefore the opening 112 surrounded by the side wall 111 is called the top opening, and the opening 113 is called the bottom opening.

[0048] In this way, the heating film 2 is arranged on the bottom support 1 from the bottom of the bottom support 1, the heating portion 21 of the heating film 2 corresponds to the bottom opening 113 of the electric core accommodating groove 11, and when one electric core 31 is arranged in one electric core accommodating groove 11 through the top opening 112 of the electric core accommodating groove 11, the first end 311 of the electric core abuts against the heating portion 21, so that the heating portion 21 directly contacts the electric core 31, which shortens the heat conduction distance, improves the heating efficiency, and does not need the glue pouring process, so that the process is relatively simple and the cost is low.

[0049] Further, from the above description, in actual application or in the conventional arrangement state of the battery module, in the direction of gravity, the electric core unit 3 is located above the bottom support 1, and the bottom support 1 is located above the heating film 2, and relatively speaking, the electric core unit 3 is heavier, so that the gravity of the electric core unit 3 can naturally and more firmly abut the first end 311 of the electric core against the heating portion 21, thereby better improving the heating efficiency.

[0050] In actual use, at least one of the above battery modules 10 is placed in the shell 20 to form a battery pack, the bottom support 1 is fixed to the shell bottom plate 201 of the shell 20, and the heating film 2 is located between the bottom support 1 and the shell bottom plate 201. By fixing the bottom support 1 to the shell bottom plate 201 of the shell 20, such as by locking screws and the like, the heating film 2 can be pressed tightly to the first end 311 of the battery cell 31, and the gravity of the battery cell unit 3 can make the first end 311 of the battery cell 31 more tightly abut against the heating part 21, thereby better improving the heating efficiency.

[0051] In actual application, the battery cell accommodating groove 11 is matched with the shape of the battery cell, as shown in Figure 1 and Figure 2 , the battery cell is cylindrical, and the battery cell accommodating groove 11 is also cylindrical, so that the battery cell can be firmly accommodated in the accommodating groove, and the space of the battery cell accommodating groove can be effectively utilized to reduce the volume of the entire battery module.

[0052] In an embodiment of the present application, two adjacent battery cell accommodating grooves 11 are connected to each other. Please refer to the schematic view of the bottom support of an embodiment of the present application as viewed from the side of the top opening thereof, as shown in Figure 6 , in actual implementation, on the side of the top opening 112 of the bottom support 1, the adjacent portions of two adjacent battery cell accommodating grooves 11 are connected to each other by the side wall 111 of the battery cell accommodating groove 11 and / or the reinforcing rib 12.

[0053] Specifically, as shown in Figure 6 , on the side of the top opening 112 of the bottom support 1, a part of the side wall 111 of the battery cell accommodating groove 11 is closed, so that the adjacent portions of two adjacent battery cell accommodating grooves 11 share the side wall 111, or the shared side wall 111 is further connected by the reinforcing rib 12. As shown in Figure 6 , on the side of the top opening 112 of the bottom support 1, a part of the side wall 111 of the adjacent portions of the battery cell accommodating groove 11 has a notch, so that the adjacent portions of two adjacent battery cell accommodating grooves 11 can partially share the side wall 111, partially have a notch, or the shared side wall 111 is further connected by the reinforcing rib 12.

[0054] In actual implementation, the reinforcing rib 12 can also be arranged at other appropriate positions, and the position of the reinforcing rib 12 is not limited in the present application. This is because the heating film 2 is located on the side of the bottom opening 113 of the bottom support 1, so for the side of the top opening 112 of the bottom support 1, the battery cell unit 3 only needs to be loaded from the side thereof, that is, the top opening 112 exists for the battery cell to be assembled into the battery cell accommodating groove 11, and other parts can add the reinforcing rib 12 as needed, and the arrangement of the reinforcing rib 12 is not affected by the heating film 2, so that the top opening 112 of the bottom support 1 can be more robust. Of course, the reinforcing rib 12 can also not be arranged, which can be arranged according to the actual product demand.

[0055] Please refer toFigure 7 The bottom support of an embodiment of the application is shown in a schematic view from the side of the bottom opening thereof. In actual implementation, the adjacent portions of two adjacent cell accommodating grooves 11 are connected to each other by the side walls 111 and / or the reinforcing ribs 12 of the cell accommodating grooves 11 at the side of the bottom opening 113 of the bottom support 1.

[0056] Specifically, as shown in Figure 7 At the side of the bottom opening 113 of the bottom support 1, the side walls 111 of the cell accommodating grooves 11 are closed, the adjacent portions of two adjacent cell accommodating grooves 11 share the side walls 111, or the shared side walls 111 are further connected by the reinforcing ribs 12. That is, at the side of the bottom opening 113 of the bottom support 1, the support portions between two adjacent cell accommodating grooves 11 in the same column or the same row are the side walls 111 of the two adjacent cell accommodating grooves 11, or the side walls 111 and the reinforcing ribs 12.

[0057] As shown in Figure 7 At the side of the bottom opening 113 of the bottom support 1, part of the four adjacent cell accommodating grooves 11 are connected together by the support connecting portions 114, and part of the four adjacent cell accommodating grooves 11 can also be hollow. The support connecting portions 114 can also make the bottom support 1 stronger.

[0058] Please refer to Figure 3 The structure of the heating film is shown in a schematic view. In a specific embodiment, the heating film 2 includes a plurality of rows and columns of heating portions 21. The heating portions 21 in the same column are connected by heating connecting portions 22, and the heating portions 21 in two adjacent columns are connected by at least one heating cross beam 23. The heating cross beam 23 is located between two opposite heating portions 21 or two opposite heating connecting portions 22 in the two adjacent columns of heating portions 21. For Figure 3 The heating film 2 is shown in a schematic view. The heating film 2 includes four columns of heating portions. The first column of heating portions and the second column of heating portions are connected by the heating cross beam 23 located between two opposite heating portions 21, and the third column of heating portions and the fourth column of heating portions are connected by the heating cross beam 23 located between two opposite heating connecting portions 22. However, the application is not limited to this, and the heating portions 21 in two adjacent columns can be connected by the heating cross beam 23 located between two opposite heating portions 21, or can be connected by the heating cross beam 23 located between two opposite heating connecting portions 22.

[0059] Please refer to Figure 1 and Figure 2The direction of the columns of the heating portions 21 in the heating film 2 is consistent with the direction of the columns of the battery cell receiving slots 11 in the bottom bracket 1, and the direction of the rows of the heating portions 21 is consistent with the direction of the rows of the battery cell receiving slots 11. Furthermore, at least a portion of the bottom opening 113 of the bottom bracket 1 is also defined as a heating port. When the heating film 2 is assembled with the bottom bracket 1, the heating connection portion 22 spans between two adjacent battery cell receiving slots 11 in the same column, and the heating crossbeam 23 spans between two adjacent columns of battery cell receiving slots 11. The heating portion 21 of the heating film 2 is embedded in the heating port, so that the first end of the battery cell can directly contact the heating portion 21.

[0060] Specifically, the above-mentioned heating beam 23 spans between two adjacent columns of battery cell accommodating grooves 11. When the two adjacent columns of heating parts 21 are connected by the heating beam 23 located between the two opposite heating parts 21, the heating beam 23 spans the side wall 111 between the two adjacent columns of battery cell accommodating grooves 11, or the side wall 111 and the reinforcing rib 12. When the two adjacent columns of heating parts 21 are connected by the heating beam 23 located between the two opposite heating connection parts 22, the heating beam 23 spans the bracket connection part 114 or the hollow area between the two adjacent columns of battery cell accommodating grooves 11.

[0061] See also Figure 7 As shown, it can also be combined Figure 6 A spacer 14 is formed on one side of the bottom opening 113 of the bottom bracket 1. The bottom opening 113 is divided into a heating port 15 and an explosion-proof passage 16 by the spacer 14. Correspondingly, an explosion-proof port is provided near the first end 311 (i.e., located on the side of the bottom opening 113) of the battery cell 31 of the bottom bracket 1. Figure 1 When the heating film 2 is positioned on the side of the bottom opening 113 of the bottom bracket 1 and the battery cell is placed in the battery cell receiving slot 11, the heating portion 21 is embedded in the heating opening 15, and the explosion-proof opening of the battery cell 31 aligns with the explosion-proof passage opening 16. In this way, under normal conditions or in use, the heating portion 21 directly contacts a portion of the first end 311 of the battery cell 31 to heat it. The explosion-proof passage opening 16 is positioned in correspondence with the explosion-proof opening of the battery cell 31, forming an explosion-proof passage and improving reliability.

[0062] See also Figure 7 As shown, it can also be combined Figure 1 and Figure 6 A support plate 13 is formed on one side of the bottom opening 113 of the bottom bracket 1. The support plate 13 and the spacing channel 14 together define a heating port 15. Specifically, the support plate 13 and the spacing channel 14 used to separate a row of bottom openings 113 define a plurality of mutually connected heating ports 15, and the plurality of heating ports 15 form a semicircular structure. Figure 3The heating section 21 of the heating film 2 is also a semicircular structure in communication with each other, that is, the outer contour of the area defined by the support plate 13 and the spacing channel 14 is consistent with the outer contour of the heating film 2.

[0063] In fact, the support plate 13 and the spacing channel 14 have a certain thickness, that is, the support plate 13 and the spacing channel 14 have side walls, and the heating film 2 also has a certain thickness, that is, the heating film 2 has side walls. When the heating film 2 is placed on the side of the bottom opening 113 of the bottom support 1, the side walls of the heating film 2 are engaged with the side walls of the support plate 13 and the spacing channel 14, so that the heating section 21 is embedded into the heating port from the bottom of the bottom support 1, so that the heating section 21 can be in direct contact with the first end of the battery cell.

[0064] Please refer to Figure 7 , and please refer to Figure 1 , the spacing channel 14 separates the bottom opening 113 into the heating port 15 and the explosion-proof passage port 16. The heating section 21 of the heating film 2 is embedded into the heating port 15, and the spacing channel 14 makes the heating film 2 avoid the explosion-proof port 3111 of the battery cell 31. Further, as shown in Figure 7 , the side wall 111 on one side of the explosion-proof passage port 16 also has a boss 1111, which also has a certain thickness. Thus, the spacing channel 14 and the boss 1111 can separate the explosion-proof port 3111 of the battery cell 31 from the bottom plate 201 of the shell 20 to form an explosion-proof passage, thereby improving the reliability of the battery module.

[0065] As shown in Figure 3 , the heating film 2 can be an elongated structure and partially has a hollow structure, which is inconvenient to move during assembly. In actual implementation, please refer to the structure diagram of the heating film fixed on the epoxy plate of an embodiment of the present application as shown in Figure 8 , and please refer to the explosion diagram of the heating film and the epoxy plate of an embodiment of the present application as shown in Figure 9 , as shown in Figure 8 and 9 , the heating film 2 is fixed on the epoxy plate 4, which is used to support the heating film 2 and can be used for positioning, which is convenient for assembly.

[0066] Please refer to the bottom perspective view of the battery module of another embodiment of the present application as shown in Figure 10 , and please refer to Figure 8 , in actual implementation, the heating film 2 is fixed on the epoxy plate 4, which is located on the bottom side of the heating film 2 and avoids the explosion-proof passage port 16.

[0067] More specifically, as shown in Figure 8 and 9 , the epoxy plate 4 includes at least one positioning hole 41, and please refer to Figure 1 andFigure 7 At least one protrusion 131 is formed on the support plate 13, and one protrusion 131 is aligned with a positioning hole 41 on the epoxy plate 4. In the actual assembly, the heating film 2 is first fixed on the epoxy plate 4, and then the positioning hole 41 on the epoxy plate 4 is aligned with the protrusion 131 on the support plate 13, and the protrusion 131 is correspondingly engaged with the positioning hole 41, so that the epoxy plate 4 and the heating film 2 are positioned together at the predetermined position on the bottom bracket 1. Please also combine Figure 1 、 Figure 7 and Figure 10 The protrusion 131 is annular, and the corresponding positioning hole 41 on the epoxy plate 4 is circular, so as to achieve corresponding engagement. Of course, the present application does not limit its specific structure, as long as they can engage with each other.

[0068] In an actual implementation embodiment, the heating film 2 can be first fixed on the epoxy board 4 by bonding or other methods. The present application does not limit the specific method of fixing the heating film 2 on the epoxy board 4.

[0069] Furthermore, Figure 3 、 Figure 8 and Figure 9 The heating film 2 includes two pins 24, one is a positive pin and the other is a negative pin, so as to energize the heating film 2.

[0070] Of course, in actual implementation, it can be selected whether the battery module includes the epoxy plate 4 according to actual needs. For a battery module that does not include the epoxy plate 4, the protrusion 131 may not be provided on the support plate 13, and the thickness of the spacer 14, the support plate 13 and the heating film 2 are consistent, so that the battery module can be stably mounted on the bottom plate 201 of the housing. Figure 10 The battery module includes a structure of epoxy plate 4, which can also be combined with Figure 1 A protrusion 131 is provided on the support plate 13 , and the thickness of the protrusion 131 can be consistent with the thickness of the epoxy plate 4 , so that the battery module can be stably mounted on the bottom plate 201 of the shell.

[0071] More preferably, for a battery module that does not include the epoxy plate 4, the thickness of the boss 1111 is consistent with the thickness of the spacer 14 and the support plate 13. That is, after the heating film 2 is assembled, the bottom of the battery module is on the same plane, and the battery module can be stably mounted on the housing bottom plate 201. For a battery module that includes the epoxy plate 4, the thickness of the boss 1111 is consistent with the thickness of the spacer 14, and is consistent with the sum of the thickness of the support plate 13 and the protrusion 131. That is, after the heating film 2 and the epoxy plate 4 are assembled, the bottom of the battery module is on the same plane, and the battery module can be stably mounted on the housing bottom plate 201.

[0072] In practical applications, one battery module can be composed of multiple rows and columns of battery cells, at this time, the number of rows and columns of the battery cell accommodating grooves 11 in the bottom support 1 can be completely consistent with the number of rows and columns of the battery cells, then one battery module corresponds to one bottom support 1. Of course, the number of rows and columns of the battery cell accommodating grooves 11 in the bottom support 1 can also be less than the number of rows and columns of the battery cells, then one battery module corresponds to multiple bottom supports 1.

[0073] And in one application, the number of rows and columns of the heating part 21 in one heating film 2 can also be completely consistent with the number of rows and columns of the battery cell accommodating grooves 11, then one heating film 2 corresponds to one bottom support 1. Of course, the number of rows and columns of the heating part 21 in one heating film 2 can also be less than the number of rows and columns of the battery cell accommodating grooves 11, then multiple heating films 2 correspond to one bottom support 1.

[0074] In practical applications, since the battery cells located at the edge of the shell 20 are prone to heat loss, if all the battery cells are heated with the same power, it will cause the problem that the temperature of the battery cells located in the middle of the battery module is high and the temperature of the battery cells at the edge is low. Therefore, in practical applications, the power required for heating the edge battery cells is greater than the power required for heating the middle battery cells, which can be achieved by setting more heating wires in the heating film 2 for heating the edge battery cells than in the heating film 2 for heating the middle battery cells. For the case of one battery module corresponding to multiple heating films 2 described above, it can be achieved by selecting more heating wires in the heating film 2 arranged at the edge than in the heating film 2 arranged in the middle part, without the need to arrange different heating wires in different parts of one heating film 2, which makes the manufacturing process of the heating film simple and low in cost.

[0075] Of course, the present application does not limit the bottom support to be as shown in Figure 6 and Figure 7 , nor does it limit the heating film to be as shown in Figure 3 . As long as the heating port 15 and the heating part 21 are matched in shape, it is acceptable. For the battery cell shown in Figure 1 and Figure 10 , the explosion-proof port 3111 of the battery cell 31 is located on one side of the first end 311 of the battery cell 31, so Figure 6 and Figure 7 , the spacing channel 14 of the bottom support separates the bottom opening 113 of the battery cell accommodating groove 11 into two semicircular structures from the middle, one semicircular structure is matched with the shape of the heating part 21 and serves as a heating port for accommodating one heating part 21, and the other semicircular structure serves as an explosion-proof passage.

[0076] Specifically, please refer to the bottom perspective view of the battery module of another embodiment of the present application shown in Figure 11 , and Figure 12The structure diagram of the heating film fixed on the epoxy plate of another embodiment of the application is shown. Each heating part 21 is a ring-like structure, a circular opening is formed in the middle of the ring-like structure, and the circular opening forms an explosion-proof opening. Correspondingly, the first end 311 of the battery cell 31 of the bottom support 1 is provided with an explosion-proof opening near the middle area. When the heating film 2 is placed on the side of the bottom opening 113 of the bottom support 1, the side wall of the heating film 2 is clamped with the side wall of the support plate 13, and the ring-like structure area of the bottom opening 113 serves as a heating opening. The heating part 21 directly contacts the first end of the battery cell for heating. The explosion-proof opening of the battery cell 31 is correspondingly arranged with the explosion-proof opening, forming an explosion-proof channel. Figure 11 As shown, the heating film 2 avoids the explosion-proof opening after being assembled. The other structures are the same as described above, and will not be described here.

[0077] Please refer to Figure 13 The bottom view diagram of the battery module of another embodiment of the application is shown, and Figure 14 The structure diagram of the heating film fixed on the epoxy plate of another embodiment of the application is shown. Each heating part 21 is a circular structure, and the bottom opening side of the corresponding bottom support 1 can be without a spacing channel. The bottom opening 113 can serve as a heating opening. Correspondingly, the first end 311 of the battery cell 31 of the bottom support 1 is without an explosion-proof opening. In this way, the heating part 21 matches the bottom opening and is located in the bottom opening. The other structures are the same as described above, and will not be described here.

[0078] The application also provides a battery pack, which can be referred to Figure 4 and Figure 5 which comprises at least one battery module described above and a shell 20, and the battery module is arranged on the shell bottom plate 201.

[0079] Further, as shown in Figure 5 , the battery module in the battery pack further comprises a top support 6. In this way, the two ends of the battery cell are fixed by the top support 6 and the bottom support 1 respectively, so that the assembly is more firm. In addition, the top support can also be used for assisting the lead-out of the electrode of the battery cell. The structure of the top support is not limited in the application.

[0080] In an embodiment of the application, a battery pack assembly method is also provided. Please refer to Figures 1 to 14 which comprises:

[0081] providing a shell 20, the shell 20 comprising a shell bottom plate 201;

[0082] providing at least one heating film 2, the heating film 2 comprising a plurality of heating parts 21;

[0083] providing at least one epoxy plate 4, one heating film 2 is fixed on at least one epoxy plate 4, forming at least one heating assembly (such asFigure 8 、 Figure 12 as shown in FIG. 1);

[0084] The bottom support 1 is provided, which comprises a plurality of rows and columns of cell accommodating grooves 11, each of which comprises a side wall 111 and a top opening 112 and a bottom opening 113 enclosed by the side wall 111;

[0085] The heating assembly is clamped on one side of the bottom opening 113 of the bottom support 1, and one heating part 21 of the heating film 2 is correspondingly embedded in one bottom opening 113.

[0086] The cell unit 3 is provided, which comprises a plurality of rows and columns of cells. Each cell in the cell unit 3 is correspondingly placed in one cell accommodating groove 11 through the top opening 112 of the cell accommodating groove 11, and the first end of the cell abuts against the heating part 21 located at the bottom opening 113. The direction of the column in which the heating parts 21 of the heating film 2 are arranged is consistent with the direction of the column of the cell accommodating grooves 11 in the bottom support 1, and the direction of the row in which the heating parts 21 are arranged is consistent with the direction of the row of the cell accommodating grooves 11.

[0087] Further, the heating assembly is clamped on one side of the bottom opening 113 of the bottom support 1, comprising: the bottom opening 113 of the bottom support 1 further forms a support plate 13 on one side, the support plate 13 forms at least one protrusion 131 thereon, the epoxy plate 4 comprises at least one positioning hole 41, the positioning hole 41 on the epoxy plate 4 is aligned with the protrusion 131 on the support plate 13, and the protrusion 131 is correspondingly clamped in the positioning hole 41, and the side wall of the heating film 2 is clamped with the side wall of the support plate 13, so that one heating part 21 of the heating film 2 is correspondingly embedded in one bottom opening 113.

[0088] Further, the bottom opening 113 of the bottom support 1 further forms a spacing channel 14 on one side, and the bottom opening 113 is spaced into a heating port 15 and an explosion-proof passage port 16 by the spacing channel 14. When the positioning hole 41 on the epoxy plate 4 is aligned with the protrusion 131 on the support plate 13, and the protrusion 131 is correspondingly clamped in the positioning hole 41, the side wall of the heating film 2 is further clamped with the side wall of the spacing channel 14, so that one heating part 21 of the heating film 2 is correspondingly embedded in one heating port 15.

[0089] Further, when each cell in the cell unit 3 is correspondingly placed in one cell accommodating groove 11 through the top opening 112 of the cell accommodating groove 11, the explosion-proof port of one cell corresponds to one explosion-proof passage port.

[0090] Further, the bottom support 1 is further fixed to the bottom plate 201 of the shell through a fixing member.

[0091] The principle and advantages are the same as those of the battery module described above, and will not be repeated here.

[0092] While embodiments of the present disclosure and the advantages thereof have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims.

[0093] Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein can be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope all processes, machines, manufacture, compositions of matter, means, methods, or steps substantially as such.

Claims

1. A battery module, characterized in that: include: A bottom bracket, comprising a plurality of rows and columns of battery cell accommodating slots, each of the battery cell accommodating slots comprising side walls and a top opening and a bottom opening surrounded by the side walls; A heating film, comprising a plurality of heating portions, wherein the heating film is placed on a side of the bottom bracket where the bottom opening is located, and one heating portion of the heating film is correspondingly located at one of the bottom openings; The battery cell unit includes multiple rows and columns of battery cells. One battery cell is accommodated in one battery cell accommodating groove, and the first end of the battery cell abuts against the heating portion located at the bottom opening.

2. The battery module according to claim 1, wherein: The battery module is placed in a shell, the shell includes a shell bottom plate, the bottom bracket is fixed to the shell bottom plate, and the heating film is located between the bottom bracket and the shell bottom plate.

3. The battery module according to claim 2, characterized in that: In the direction of gravity, the battery cell unit is located above the bottom bracket, and the bottom bracket is located above the heating film, wherein the side close to the bottom plate of the shell is called "lower" or "bottom", and the opposite side is called "upper" or "top".

4. The battery module according to claim 1, wherein: At least a portion of the bottom opening of the bottom support is also defined as a heating port.

5. The battery module according to claim 4, characterized in that: The heating portion matches the shape of the heating port, and one heating portion is embedded in one heating port.

6. The battery module according to claim 5, characterized in that: The heating port and the heating portion are semicircular, annular or circular structures.

7. The battery module according to any one of claims 4 to 6, characterized in that: At least a portion of the bottom opening of the bottom bracket is further defined as an explosion-proof passage opening.

8. The battery module according to claim 7, characterized in that: The heating portion directly contacts a portion of the first end of the battery core, and the explosion-proof passage opening is arranged corresponding to the explosion-proof opening of the battery core.

9. The battery module according to claim 1, wherein: It also includes an epoxy plate, and the heating film is fixed on the epoxy plate.

10. A battery pack, characterized in that: The invention comprises at least one battery module according to claim 1 and a shell, wherein a plurality of the battery modules are arranged on the bottom plate of the shell.

11. A method for assembling a battery pack, characterized in that: include: Providing a housing, the housing comprising a housing bottom plate; Providing at least one heating film, wherein the heating film comprises a plurality of heating portions; Providing at least one epoxy board, wherein one heating film is fixed on at least one epoxy board to form at least one heating element; Providing a bottom bracket, the bottom bracket comprising multiple rows and columns of battery cell accommodating slots, each of the battery cell accommodating slots comprising side walls and a top opening and a bottom opening surrounded by the side walls; The heating assembly is clamped on one side of the bottom opening of the bottom bracket, and a heating portion of the heating film is correspondingly embedded in one of the bottom openings; A battery cell unit is provided, which includes multiple rows and columns of battery cells. Each battery cell in the battery cell unit is placed in a corresponding battery cell accommodating groove through the top opening of a battery cell accommodating groove, and the first end of the battery cell is in contact with the heating part located at the bottom opening, wherein the direction of the column of the heating parts in the heating film is consistent with the direction of the column of the battery cell accommodating grooves in the bottom bracket, and the direction of the row of the heating parts is consistent with the direction of the row of the battery cell accommodating grooves.

12. The battery pack assembly method according to claim 11, wherein: Clamping the heating assembly to the bottom opening side of the bottom bracket includes: A support plate is further formed on one side of the bottom opening of the bottom bracket, at least one protrusion is formed on the support plate, and the epoxy plate includes at least one positioning hole. The positioning hole on the epoxy plate is aligned with the protrusion on the support plate, and the protrusion is correspondingly engaged in the positioning hole. The side wall of the heating film is engaged with the side wall of the support plate, so that a heating part of the heating film is correspondingly embedded in a bottom opening.

13. The battery pack assembly method according to claim 12, wherein: A spacing channel is also formed on one side of the bottom opening of the bottom bracket, and the bottom opening is divided into a heating port and an explosion-proof channel port by the spacing channel. When the positioning hole on the epoxy plate is aligned with the protrusion on the support plate and the protrusion is correspondingly engaged in the positioning hole, the side wall of the heating film is also engaged with the side wall of the spacing channel, so that one heating part of the heating film is correspondingly embedded in a heating port.

14. The battery pack assembly method according to claim 13, wherein: When each battery cell in the battery cell unit is placed in a corresponding battery cell accommodating groove through the top opening of the battery cell accommodating groove, the explosion-proof opening of a battery cell corresponds to an explosion-proof channel opening.

Images