Battery module and battery pack

Abstract

The application provides a battery module, comprising: a bottom support comprising a plurality of rows and columns of cell accommodating grooves, each of the cell 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 a side of the bottom support where the bottom openings are located, and one of the heating portions of the heating film is located at one of the bottom openings; and a cell unit comprising a plurality of rows and columns of cells, one of the cells being accommodated in one of the cell accommodating grooves, and a first end of the cell abutting against the heating portion located at the bottom opening.

Description

Technical Field

[0001] This application relates to the field of energy storage, and in particular to a battery module and battery pack. Background Technology

[0002] The core operating mechanism of electrochemical energy storage systems involves configuring numerous battery cells in series and parallel connections. Series connections increase the system's output voltage, while parallel connections increase the system's energy storage capacity to adapt to diverse power application scenarios and load demands. This energy storage configuration optimizes power management efficiency and enhances the flexibility and reliability of energy utilization.

[0003] Typically, energy storage battery packs are formed by connecting battery modules in series and parallel, and battery modules are formed by connecting battery cells in series and parallel. In other words, a single battery cell is the smallest energy storage unit in an energy storage battery pack. Therefore, the single battery cell is also the core internal component of an energy storage battery pack, converting chemical energy into electrical energy or vice versa through chemical reactions for storage. Consequently, the performance of a single battery cell directly affects key parameters of the energy storage battery pack, such as capacity, voltage, charge / discharge rate, and lifespan.

[0004] In practical applications, energy storage battery packs may be used in various extreme environments, which presents numerous challenges to their performance. For example, when an energy storage battery pack is in an extreme low-temperature environment (such as -20℃ to -25℃), directly charging it can lead to many problems such as lithium dendrite precipitation, low charging efficiency, and irreversible capacity decay. It may also cause internal short circuits or even explosions, posing serious safety hazards. Directly discharging it will also lead to a significant decrease in discharge capacity, reduced discharge efficiency, shortened battery life, and reduced safety.

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

[0006] Currently, a common heating method is external heat source heating, such as using heating wires or heating films to convert electrical energy into heat energy and transfer it to the battery cell for heating.

[0007] Specifically, the heating wire or heating film can be fixed to the surface of the battery cell body, the first end of the battery cell, or the second end opposite to the first end. Typically, one of the first or second ends of the battery cell is the electrode, used to set the positive and negative terminals of the battery cell, which can be referred to as the top, and the other is used to set the explosion-proof opening, which can be referred to as the bottom. However, this application does not limit this, and the positive and negative terminals and the explosion-proof opening may also be located on the same end of the battery cell. To improve heating efficiency, good thermal contact between the heating wire or heating film and the battery cell is required.

[0008] Therefore, when the heating wire or heating film is fixed to the surface of the battery cell, thermally conductive adhesive is needed to make physical contact between the heating wire or heating film and the battery cell. Similarly, when the heating wire or heating film is fixed to the top and bottom of the battery cell, thermally conductive adhesive is also needed to make physical contact between the heating wire or heating film and the top or bottom of the battery cell. At this time, it is also necessary to avoid the explosion-proof port or electrodes. This makes the potting process complex and costly. In addition, the physical contact formed by thermally conductive adhesive also results in a long heat conduction path and low heat conduction efficiency.

[0009] When a short circuit, overcharge, or other abnormal situation occurs inside the battery, it may cause a large amount of gas to be generated inside the battery, resulting in a sharp increase in internal pressure. To meet UL certification standards, the top and / or bottom of the battery cell need to be equipped with explosion-proof vents (also known as safety valves or pressure relief valves) and corresponding explosion-proof channels to release internal pressure. This is a very important and necessary safety feature in battery design. The explosion-proof vents can automatically open when the pressure reaches a certain threshold, releasing internal pressure and thus preventing battery explosion. Therefore, the thermally conductive adhesive must avoid the explosion-proof vents and channels.

[0010] This shows that current cell heating methods suffer from low heating efficiency, high cost, and complex processes. Utility Model Content

[0011] According to one embodiment, this application provides a battery module, including: a bottom bracket including multiple rows and columns of cell receiving slots, each of the cell receiving slots including a side wall and a top opening and a bottom opening enclosed by the side wall; a heating film including multiple heating parts, wherein the heating film is placed on one side of the bottom opening of the bottom bracket, and one of the heating parts of the heating film is located at one of the bottom openings; and a cell unit including multiple rows and columns of cells, one of the cells being received in one of the cell receiving slots, and a first end of the cell abutting against the heating part located at the bottom opening.

[0012] Furthermore, the battery module is placed inside the housing, which includes a housing base plate, a bottom bracket fixed to the housing base plate, and a heating film located between the bottom bracket and the housing base plate.

[0013] Furthermore, in the direction of gravity, the battery cell unit is located above the bottom support, which is located above the heating film. The side closer to the bottom plate of the housing is referred to as "lower" or "bottom", and the opposite side is referred to as "upper" or "top".

[0014] Furthermore, at least a portion of the bottom opening of the bottom bracket is also defined as a heating port.

[0015] Furthermore, the heating element is shaped to match the heating port, with one heating element embedded within one heating port.

[0016] Furthermore, the heating port and the heating part are semi-circular, annular, or circular in structure.

[0017] Furthermore, at least a portion of the bottom opening of the bottom bracket is also defined as an explosion-proof passageway.

[0018] Furthermore, the heating element directly contacts a portion of the first end of the battery cell, and the explosion-proof channel is correspondingly provided with the explosion-proof port of the battery cell.

[0019] Furthermore, it also includes an epoxy board, to which the heating film is fixed.

[0020] This application also provides a battery pack, including at least one of the above-described battery modules and a housing, wherein a plurality of the battery modules are arranged on the bottom plate of the housing.

[0021] The features and technical advantages of this disclosure have been outlined quite extensively above to facilitate a better understanding of the detailed description that follows. Additional features and advantages of this disclosure, which form the subject matter of the claims, will be described below. Those skilled in the art will understand that the disclosed concepts and specific embodiments can be readily used as the basis for modifying or designing other structures or processes for achieving the same purpose as this disclosure. Those skilled in the art will also recognize that such equivalent structures do not depart from the spirit and scope of this disclosure as set forth in the appended claims. Attached Figure Description

[0022] To gain a more complete understanding of this disclosure and its advantages, the following description is given in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 This is a bottom view schematic diagram of a battery module according to an embodiment of this application;

[0024] Figure 2 An exploded view of a battery module according to an embodiment of this application is shown;

[0025] Figure 3 A schematic diagram of the structure of a heating film according to an embodiment of this application is shown;

[0026] Figure 4 A schematic diagram of a battery module placed inside a housing according to an embodiment of this application is shown;

[0027] Figure 5 An exploded view of an energy storage battery pack according to an embodiment of this application is shown;

[0028] Figure 6A schematic diagram of the bottom bracket according to an embodiment of this application is shown, viewed from the side with its top opening.

[0029] Figure 7 A schematic diagram of the bottom bracket according to an embodiment of this application is shown, with its bottom opening side as the viewpoint;

[0030] Figure 8 This illustration shows a schematic diagram of a heating film fixed to an epoxy board according to an embodiment of this application;

[0031] Figure 9 An exploded view of the heating film and epoxy board according to an embodiment of this application is shown;

[0032] Figure 10 A bottom view schematic diagram of a battery module according to another embodiment of this application is shown;

[0033] Figure 11 A bottom view schematic diagram of a battery module according to another embodiment of this application is shown;

[0034] Figure 12 A schematic diagram of a heating film fixed on an epoxy board according to another embodiment of this application is shown;

[0035] Figure 13 A bottom view schematic diagram of a battery module according to another embodiment of this application is shown;

[0036] Figure 14 A schematic diagram of a heating film fixed on an epoxy board according to another embodiment of this application is shown.

[0037] Unless otherwise stated, corresponding numbers and symbols in the various figures generally refer to corresponding parts. These figures are drawn to clearly illustrate relevant aspects of the various embodiments and are not necessarily drawn to scale. Detailed Implementation

[0038] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] For details, please refer to Figure 1 The diagram shown is a bottom view of a battery module according to an embodiment of this application. Figure 2 The diagram shown is an exploded view of a battery module according to an embodiment of this application. Figure 3 The diagram shown is a structural schematic of a heating film according to an embodiment of this application. The battery module proposed in this application includes:

[0040] The bottom support 1 includes multiple rows and columns of cell receiving slots 11, each cell receiving slot 11 including a side wall 111 and a top opening 112 and a bottom opening 113 enclosed by the side wall 111;

[0041] The heating film 2 includes a plurality of heating parts 21, wherein the heating film 2 is placed on one side of the bottom opening 113 of the bottom support 1, and one heating part 21 of the heating film 2 is located at one bottom opening 113.

[0042] The battery cell unit 3 includes multiple rows and columns of battery cells 31. One battery cell 31 is housed in a battery cell receiving slot 11, and the first end 311 of the battery cell 31 abuts against the heating part 21 located at the bottom opening 113.

[0043] For further details, please refer to Figure 4 The diagram shown illustrates a battery module placed inside a housing according to an embodiment of this application, and... Figure 5 The exploded view of an embodiment of the energy storage battery pack shown in this application is as follows: Figure 4 and Figure 5 As shown, in practical applications or in the conventional placement of the battery module, the battery module 10, formed by the cell unit 3, the bottom support 1, and the heating film 2, is placed on the bottom plate 201 inside the housing 20 in the direction of gravity. Specifically, the cell 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 bottom plate 201. Alternatively, the bottom plate 201 can be described as being below the heating film 2, the heating film 2 as being below the bottom support 1, and the bottom support 1 as being below the cell unit 3. In other words, in this application, the side closer to the bottom plate 201 is referred to as "lower" or "bottom," and the opposite side is referred to as "upper" or "top." Therefore, the opening 112 enclosed by the side wall 111 is called the top opening, and the opening 113 is called the bottom opening.

[0044] Thus, the heating film 2 is mounted on the bottom support 1 from the bottom of the bottom support 1. The heating part 21 of the heating film 2 is located at the bottom opening 113 of the cell receiving groove 11. When a cell 31 is received in a cell receiving groove 11 through the top opening 112 of the cell receiving groove 11, the first end 311 of the cell can abut against the heating part 21. The heating part 21 and the cell 31 are in direct contact, which shortens the heat conduction distance, improves the heating efficiency, and eliminates the need for a potting process. Therefore, the process is relatively simple and the cost is low.

[0045] Furthermore, as can be seen from the above description, in practical applications or when the battery module is in its normal placement state, in the direction of gravity, the cell unit 3 is located on the bottom support 1, and the bottom support 1 is located on the heating film 2. Relatively speaking, the cell unit 3 is heavier. Therefore, the gravity of the cell unit 3 can make the first end 311 of the cell naturally and more firmly abut against the heating part 21, thereby improving the heating efficiency.

[0046] In practical use, at least one of the aforementioned battery modules 10 is placed inside the housing 20 to form a battery pack. The bottom bracket 1 is fixed to the housing base plate 201 of the housing 20, and the heating film 2 is located between the bottom bracket 1 and the housing base plate 201. By fixing the bottom bracket 1 to the housing base plate 201 of the housing 20, such as with locking screws, the heating film 2 can be pressed tightly against the first end 311 of the battery cell 31. Combined with the gravity of the battery cell unit 3, the first end 311 of the battery cell 31 is more tightly pressed against the heating part 21, thereby improving the heating efficiency.

[0047] In practical applications, the cell receiving slot 11 matches the shape of the cell, such as... Figure 1 and Figure 2 As shown, the battery cell is cylindrical, and the battery cell receiving slot 11 is also cylindrical, which allows the battery cell to be firmly housed in the receiving slot and effectively utilizes the space of the battery cell receiving slot, reducing the volume of the entire battery module.

[0048] In one embodiment of this application, two adjacent cell receiving slots 11 are connected to each other. Please refer to... Figure 6 The schematic diagram shown is of the bottom bracket of an embodiment of this application with its top opening side as the viewpoint. In actual implementation, on the side of the top opening 112 of the bottom bracket 1, the adjacent portions of two adjacent cell receiving slots 11 are connected to each other through the side wall 111 and / or reinforcing rib 12 of the cell receiving slot 11.

[0049] Specifically, such as Figure 6 As shown, on one side of the top opening 112 of the bottom bracket 1, a portion of the sidewall 111 of the cell receiving slot 11 is closed. Therefore, adjacent portions of two adjacent cell receiving slots 11 share the same sidewall 111, or the shared sidewall 111 is connected by reinforcing ribs 12. Figure 6 As shown, on one side of the top opening 112 of the bottom bracket 1, there is a gap in the side wall 111 of the adjacent part of the cell receiving slot 11. The adjacent parts of two adjacent cell receiving slots 11 can partially share the side wall 111, partially have a gap, or the shared side wall 111 can be connected by a reinforcing rib 12.

[0050] In practical implementation, reinforcing ribs 12 can also be set in other suitable locations. This application does not limit the location of the reinforcing ribs 12. This is because the heating film 2 is located on the side where the bottom opening 113 of the bottom bracket 1 is located. Therefore, for the side of the top opening 112 of the bottom bracket 1, it is only necessary to install the battery cell unit 3 from the side where it is located. That is, the battery cell can be installed into the battery cell receiving slot 11 with the top opening 112. Other parts can be reinforced with reinforcing ribs 12 as needed. The setting of the reinforcing ribs 12 is not affected by the heating film 2, which can make the top bracket stronger. Of course, the reinforcing ribs 12 can also be omitted, which can be set according to the actual product requirements.

[0051] Please see Figure 7 The schematic diagram shown is of the bottom bracket of an embodiment of this application with its bottom opening side as the viewpoint. In actual implementation, on the bottom opening 113 side of the bottom bracket 1, the adjacent portions of two adjacent cell receiving slots 11 are connected to each other through the side wall 111 and / or reinforcing rib 12 of the cell receiving slot 11.

[0052] Specifically, such as Figure 7 As shown, on the side of the bottom opening 113 of the bottom bracket 1, the side wall 111 of the cell receiving slot 11 is closed. Therefore, adjacent portions of two adjacent cell receiving slots 11 share the side wall 111, or the shared side wall 111 is connected by a reinforcing rib 12. That is, on the side of the bottom opening 113 of the bottom bracket 1, the bracket portion between two adjacent cell receiving slots 11 in the same column or row consists of the side wall 111 of the two adjacent cell receiving slots 11, or the side wall 111 and the reinforcing rib 12.

[0053] like Figure 7 As shown, on one side of the bottom opening 113 of the bottom bracket 1, a portion of four adjacent cell receiving slots 11 are connected together by a bracket connecting portion 114, and a portion of the four adjacent cell receiving slots 11 can also be hollowed out. The bracket connecting portion 114 can also make the bottom bracket 1 more robust.

[0054] Please refer to the following: Figure 3 The schematic diagram of the heating film shown illustrates that, in one specific embodiment, the heating film 2 includes multiple rows and columns of heating sections 21. Heating sections 21 in the same column are connected by heating connection sections 22, and adjacent columns of heating sections 21 are connected by at least one heating crossbeam 23. The heating crossbeam 23 is located between two opposing heating sections 21 or between two opposing heating connection sections 22 in adjacent columns. Figure 3The heating film 2 shown includes four rows of heating sections. The first and second rows of heating sections, as well as the third and fourth rows of heating sections, are connected by heating beams 23 located between two opposing heating sections 21. The second and third rows of heating sections are connected by heating beams 23 located between two opposing heating connection sections 22. However, this application does not limit this connection; adjacent rows of heating sections 21 may be connected by heating beams 23 located between two opposing heating sections 21, or they may be connected by heating beams 23 located between two opposing heating connection sections 22.

[0055] Please refer to the following: Figure 1 and Figure 2 The direction of the columns of heating parts 21 in the heating film 2 is consistent with the direction of the columns of the cell receiving slots 11 in the bottom bracket 1, and the direction of the rows of heating parts 21 is consistent with the direction of the rows of the 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 part 22 spans between two adjacent cell receiving slots 11 in the same column, and the heating crossbeam 23 spans between two adjacent columns of cell receiving slots 11. The heating parts 21 of the heating film 2 are embedded in the heating port, so that the first end of the cell can directly contact the heating part 21.

[0056] Specifically, the heating beam 23 spans between two adjacent rows of battery cell receiving slots 11. When two adjacent rows of heating parts 21 are connected by the heating beam 23 located between two opposite heating parts 21, the heating beam 23 spans the side wall 111 between two adjacent rows of battery cell receiving slots 11, or the side wall 111 and the reinforcing rib 12. When two adjacent rows of heating parts 21 are connected by the heating beam 23 located between two opposite heating connection parts 22, the heating beam 23 spans the bracket connection part 114 or the hollow area between two adjacent rows of battery cell receiving slots 11.

[0057] Please see Figure 7 As shown, it can also be combined with Figure 6 A partition channel 14 is formed on one side of the bottom opening 113 of the bottom bracket 1, dividing the bottom opening 113 into a heating port 15 and an explosion-proof passage 16. Correspondingly, an explosion-proof opening is provided on one side of the first end 311 (i.e., on the side of the bottom opening 113) of the battery cell 31 applicable to the bottom bracket 1. Please refer to [further details needed]. Figure 1When the heating film 2 is placed on the side of the bottom opening 113 of the bottom bracket 1, and the battery cell is placed in the battery cell receiving groove 11, the heating part 21 is embedded in the heating port 15, and the explosion-proof port of the battery cell 31 corresponds to the explosion-proof channel port 16. Thus, under normal conditions or in use, the heating part 21 directly contacts a portion of the first end 311 of the battery cell 31 to heat it, and the explosion-proof channel port 16 is correspondingly set with the explosion-proof port of the battery cell 31 to form an explosion-proof channel, improving reliability.

[0058] Please see Figure 7 As shown, it can also be combined with Figure 1 and Figure 6 A support plate 13 is also formed on one side of the bottom opening 113 of the bottom bracket 1. The support plate 13 and the spacer channel 14 together define a heating port 15. Specifically, the support plate 13 and the spacer channel 14 used to space a row of bottom openings 113 define a plurality of interconnected heating ports 15, and the plurality of heating ports 15 have a semi-circular structure. Please refer to [further details]. Figure 3 The heating section 21 of the heating film 2 is also a semi-circular structure that is interconnected with each other, that is, the outer contour of the area defined by the support plate 13 and the spacer 14 matches the outer contour of the heating film 2.

[0059] In fact, the support plate 13 and the spacer channel 14 have a certain thickness, that is, the support plate 13 and the spacer channel 14 have sidewalls. Similarly, the heating film 2 also has a certain thickness, that is, the heating film 2 has sidewalls. When the heating film 2 is placed on the side where the bottom opening 113 of the bottom bracket 1 is located, the sidewall of the heating film 2 engages with the sidewall of the support plate 13 and the spacer channel 14. In this way, the heating part 21 is embedded from the bottom of the bottom bracket 1 into the heating port, so that the heating part 21 can directly contact the first end of the battery cell.

[0060] Please refer to the following: Figure 7 And please combine Figure 1 The spacer 14 divides the bottom opening 113 into a heating port 15 and an explosion-proof channel 16. The heating part 21 of the heating film 2 is embedded in the heating port 15, thus the spacer 14 allows the heating film 2 to avoid the explosion-proof port 3111 of the battery cell 31. Furthermore, as... Figure 7 As shown, a boss 1111 is also formed on the side wall 111 located on one side of the explosion-proof passage 16. The boss 1111 also has a certain thickness. In this way, the partition 14 and the boss 1111 can separate the explosion-proof opening 3111 of the cell 31 from the bottom plate 201 of the housing 20, thereby forming an explosion-proof passage to improve the reliability of the battery module.

[0061] like Figure 3 As shown, the heating film 2 may have a slender structure, and some parts may have perforations, making it inconvenient to move during assembly. Please refer to the following for actual implementation: Figure 8The diagram shown illustrates a structural schematic of a heating film fixed to an epoxy board according to an embodiment of this application. Please refer to [link / reference]. Figure 9 The exploded view of the heating film and epoxy board according to an embodiment of this application is shown below. Figure 8 and 9 As shown, the heating film 2 is fixed on the epoxy board 4. The epoxy board 4 is used to support the heating film 2 and can also be used for positioning, which facilitates assembly.

[0062] Please see Figure 10 The diagram shown is a bottom view of a battery module according to another embodiment of this application. Please refer to it in conjunction with... Figure 8 In actual implementation, the heating film 2 is fixed on the epoxy board 4, which is located on the bottom side of the heating film 2 and avoids the explosion-proof passage 16.

[0063] More specifically, such as Figure 8 and 9 As shown, the epoxy board 4 includes at least one positioning hole 41, and please combine it with... Figure 1 and Figure 7 At least one protrusion 131 is formed on the support plate 13, and one protrusion 131 is aligned and engaged in a positioning hole 41 on the epoxy plate 4. Thus, during actual assembly, the heating film 2 is first fixed to the epoxy plate 4, 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 engaged in the corresponding positioning hole 41, thereby positioning the epoxy plate 4 and the heating film 2 together in a predetermined position on the bottom bracket 1. Please refer to... 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, this application does not limit its specific structure, as long as they can engage with each other.

[0064] In one embodiment of the actual implementation, the heating film 2 can be fixed to the epoxy board 4 by means of bonding or other methods. This application does not limit the specific method of fixing the heating film 2 to the epoxy board 4.

[0065] Furthermore, such as Figure 3 , Figure 8 and Figure 9 The heating film 2 in the middle includes two pins 24, one positive pin and one negative pin, for energizing the heating film 2.

[0066] Of course, in actual implementation, the inclusion of the epoxy board 4 in the battery module can be selected according to actual needs. For battery modules that do not include the epoxy board 4, the protrusion 131 may not be provided on the support plate 13, and the thicknesses of the spacer channel 14, the support plate 13, and the heating film 2 should be consistent, thus allowing the battery module to be stably mounted on the housing base plate 201. Figure 10The battery module includes an epoxy board 4 structure, which can also be combined with Figure 1 The support plate 13 is provided with a protrusion 131, the thickness of which can be the same as the thickness of the epoxy plate 4, so that the battery module can be stably mounted on the bottom plate 201 of the housing.

[0067] More preferably, for battery modules excluding the epoxy plate 4, the thickness of the boss 1111 is the same as the thickness of the spacer channel 14 and the support plate 13. That is, after assembling the heating film 2, the bottom of the battery module is on a single plane, allowing the battery module to be stably mounted on the housing base plate 201. For battery modules including the epoxy plate 4, the thickness of the boss 1111 is the same as the thickness of the spacer channel 14, and is also the same as the sum of the thicknesses of the support plate 13 and the protrusion 131. That is, after assembling the heating film 2 and the epoxy plate 4, the bottom of the battery module is on a single plane, allowing the battery module to be stably mounted on the housing base plate 201.

[0068] In practical applications, a battery module can be composed of multiple rows and columns of battery cells. In this case, the number of rows and columns of the cell receiving slots 11 in the bottom bracket 1 can be exactly the same as the number of rows and columns of the battery cells, and one battery module corresponds to one bottom bracket 1. Alternatively, the number of rows and columns of the cell receiving slots 11 in the bottom bracket 1 can be less than the number of rows and columns of the battery cells, in which case one battery module corresponds to multiple bottom brackets 1.

[0069] In one application, the number of rows and columns of heating parts 21 in a heating film 2 can be exactly the same as the number of rows and columns of the battery cell receiving groove 11, in which case one heating film 2 corresponds to one bottom support 1. Of course, the number of rows and columns of heating parts 21 in a heating film 2 can also be less than the number of rows and columns of the battery cell receiving groove 11, in which case multiple heating films 2 correspond to one bottom support 1.

[0070] In practical applications, because the cells located at the edges of the casing 20 are prone to heat loss, if all cells are heated with the same power, it will result in the cells in the middle of the battery module having a higher temperature and the cells at the edges having a lower temperature. Therefore, in practical applications, the heating power for the edge cells needs to be greater than the heating power for the cells in the middle. This can be achieved by setting more heating wires in the heating film 2 for heating the edge cells than for heating the cells in the middle. For the case of a battery module with multiple heating films 2, the heating wires in the heating film 2 at the edges can be set more than those in the heating film 2 at the middle, eliminating the need to set different heating wires in different parts of a heating film 2. This simplifies the manufacturing process of the heating film and reduces costs.

[0071] Of course, this application does not limit the bottom support to such a form. Figure 6 and Figure 7 As shown, the heating film is not limited to such a shape. Figure 3As shown. It is sufficient that the shape of the spaced-out heating port 15 matches that of the heating section 21. For Figure 1 and Figure 10 The battery cell shown has its explosion-proof port 3111 located on one side of the first end 311 of the battery cell 31. Figure 6 and Figure 7 The bottom bracket of the battery cell receiving slot 11 has a partition channel 14 that divides the bottom opening 113 of the battery cell receiving slot 11 into two semi-circular structures. One semi-circular structure matches the shape of the heating part 21 and serves as a heating port for accommodating a heating part 21. The other semi-circular structure serves as an explosion-proof channel.

[0072] For details, please refer to Figure 11 The diagram shown is a bottom view of a battery module according to another embodiment of this application, and Figure 12 The diagram shows a structural schematic of a heating film fixed to an epoxy board according to another embodiment of this application. Each heating element 21 has a quasi-annular structure with a quasi-circular opening in the middle, forming an explosion-proof channel. Correspondingly, the first end 311 of the battery cell 31, which is suitable for the bottom support 1, has an explosion-proof opening near the middle area. When the heating film 2 is placed on the side where the bottom opening 113 of the bottom support 1 is located, the sidewall of the heating film 2 engages with the sidewall of the support plate 13. The quasi-annular structure area of ​​the bottom opening 113 then serves as the heating opening, and the heating element 21 directly contacts the first end of the battery cell for heating. The explosion-proof channel is correspondingly provided with the explosion-proof opening of the battery cell 31, forming an explosion-proof channel. Figure 11 As shown, after assembling the heating film 2, the heating film 2 avoids the explosion-proof opening. The other structures are the same as described above, and will not be repeated here.

[0073] Please see Figure 13 The diagram shown is a bottom view of a battery module according to another embodiment of this application, and Figure 14 The diagram shows a structural schematic of a heating film fixed to an epoxy board according to another embodiment of this application. Each heating element 21 has a near-circular structure, so the bottom opening side of the corresponding bottom bracket 1 can be without gaps, and all bottom openings 113 can serve as heating ports. Correspondingly, the first end 311 of the battery cell 31 used in the bottom bracket 1 does not have an explosion-proof opening, thus the heating element 21 matches the bottom opening and is located within the bottom opening. Other structures are the same as described above and will not be repeated here.

[0074] This application also provides a battery pack, which can be found in [reference]. Figure 4 and Figure 5 It includes at least one of the aforementioned battery modules and a housing 20, with the battery modules arranged on the housing base plate 201.

[0075] Furthermore, such as Figure 5As shown, the battery module in the battery pack also includes a top bracket 6, so that the two ends of the battery cell are fixed by the top bracket 6 and the bottom bracket 1 respectively, making the assembly more secure. In addition, the top bracket can also be used to assist in the lead-out of the battery cell electrodes. This application does not specifically limit the structure of the top bracket.

[0076] In one embodiment of this application, a method for assembling a battery pack is also provided. Please refer to... Figures 1 to 14 It includes:

[0077] A housing 20 is provided, the housing 20 including a housing base plate 201;

[0078] At least one heating film 2 is provided, the heating film 2 including a plurality of heating parts 21;

[0079] At least one epoxy plate 4 is provided, and a heating film 2 is fixed to at least one epoxy plate 4 to form at least one heating assembly (e.g., Figure 8 , Figure 12 (as shown);

[0080] A bottom support 1 is provided, the bottom support 1 includes multiple rows and columns of cell receiving slots 11, each cell receiving slot 11 includes a side wall 111 and a top opening 112 and a bottom opening 113 enclosed by the side wall 111;

[0081] The heating component is snapped into one side of the bottom opening 113 of the bottom bracket 1, and a heating part 21 of the heating film 2 is correspondingly embedded in a bottom opening 113;

[0082] A battery cell unit 3 is provided, which includes multiple rows and columns of battery cells. Each battery cell in the battery cell unit 3 is placed in a battery cell receiving slot 11 through the top opening 112 of the battery cell receiving slot 11. The first end of the battery cell abuts against the heating part 21 located at the bottom opening 113. The direction of the columns of the heating parts 21 in the heating film 2 is consistent with the direction of the columns of the battery cell receiving slot 11 in the bottom bracket 1, and the direction of the rows of the heating parts 21 is consistent with the direction of the rows of the battery cell receiving slot 11.

[0083] Furthermore, it also includes fixing the bottom bracket 1 to the base plate 201 of the housing using fasteners.

[0084] Its principle and advantages are the same as those of the battery module mentioned above, and will not be repeated here.

[0085] Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the present disclosure as defined by the appended claims.

[0086] Furthermore, the scope of this application is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, apparatuses, methods, and steps described in the specification. As will be readily understood by those skilled in the art from the disclosure of this publication, processes, machines, manufactures, compositions of matter, means, methods, or steps that perform substantially the same function, currently exist or will be developed or implemented thereafter, will yield substantially the same results as the corresponding embodiments described herein that are available according to this disclosure. Therefore, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, apparatuses, methods, or steps within their scope.

Claims

1. A battery module, characterized in that, include: The bottom support includes multiple rows and columns of cell receiving slots, each of the cell receiving slots including a side wall and a top opening and a bottom opening enclosed by the side wall; A heating film includes multiple heating portions, wherein the heating film is placed on one side of the bottom opening of the bottom support, and one heating portion of the heating film is located at one of the bottom openings; A battery cell unit includes multiple rows and columns of battery cells, one of the battery cells is housed in a battery cell receiving slot, and a first end of the battery cell abuts against the heating element located at the bottom opening.

2. The battery module according to claim 1, characterized in that, The battery module is placed inside the housing, which includes a housing base plate, a bottom bracket fixed to the housing base plate, and a heating film located between the bottom bracket and the housing base plate.

3. The battery module according to claim 2, characterized in that, In the direction of gravity, the battery cell is located above the bottom support, which is located above the heating film. The side closer to the bottom plate of the housing is referred to as "lower" or "bottom", and the opposite side is referred to as "upper" or "top".

4. The battery module according to claim 1, characterized in that, At least a portion of the bottom opening of the bottom bracket is further defined as a heating port.

5. The battery module according to claim 4, characterized in that, The heating element is shaped to match the heating port, and one heating element is embedded in one heating port.

6. The battery module according to any one of claims 4 and 5, characterized in that, At least a portion of the bottom opening of the bottom bracket is further defined as an explosion-proof passageway.

7. The battery module according to claim 6, characterized in that, The heating element directly contacts a portion of the first end of the battery cell, and the explosion-proof channel is provided corresponding to the explosion-proof port of the battery cell.

8. The battery module according to claim 1, characterized in that, It also includes an epoxy board, to which the heating film is fixed.

9. A battery pack, characterized in that, It includes at least one battery module and housing as described in claim 1, with a plurality of said battery modules arranged on the bottom plate of said housing.

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