Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, and the battery module comprises a battery cell module which comprises a plurality of battery cells; the outer layer heating sheet is wound on the edge of the outer side of the battery cell module; the inner layer heating sheet is arranged in the battery cell module in a winding manner; and each battery cell in the battery cell module is in contact with the outer-layer heating sheet and / or the inner-layer heating sheet. The heating device can simultaneously heat the inner side and the outer side of the battery cell module. Compared with a traditional single heating element, the heating uniformity can be effectively improved, and the problem of local overheating or low temperature is reduced; and heating is realized by adopting a relatively simple physical structure, so that the complexity and the cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and in particular to a battery module and a battery pack. Background Art

[0002] With the increasing popularity of electric vehicles, the charging performance of battery packs in low-temperature environments has become a key concern. In low-temperature environments, the chemical reaction rate within the battery slows, resulting in low charging efficiency or even failure to charge properly. To ensure safe and efficient charging of battery packs in low temperatures, the industry generally uses preheating technology to raise the battery temperature to the ideal operating range.

[0003] However, existing preheating technologies present a number of problems. First, because heating elements such as heating wires and PTC heaters typically only heat a specific area of ​​the battery pack, heat transfer within the pack is uneven. Some areas can be overheated while others remain cooler. This not only affects battery charging efficiency but can also accelerate battery aging and even pose safety risks. Utility Model Content

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, the present invention provides a battery module and a battery pack, which can solve the problem of different heating rates of the battery cells inside the battery pack.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A battery module comprises: a battery cell module, wherein the battery cell module includes a plurality of battery cells; an outer heating plate, wherein the outer heating plate is wound around the outer edge of the battery cell module; and an inner heating plate, wherein the inner heating plate is wound inside the battery cell module and contacts the side walls of the battery cells not contacted by the outer heating plate; wherein each battery cell in the battery cell module contacts the outer heating plate and / or the inner heating plate.

[0007] This solution enables simultaneous heating of both the inside and outside of the cell module. Compared to traditional single-element heating, this approach more effectively improves heating uniformity and reduces localized overheating or underheating. Similarly, the simpler physical structure used to achieve heating reduces complexity and cost.

[0008] Furthermore, the outer heating plate includes a first starting end and a first ending end, and the inner heating plate includes a second starting end and a second ending end, the first starting end and the first ending end are spaced apart and are located on different battery cells, and the second starting end and the second ending end are spaced apart and are located on different battery cells.

[0009] By adopting the above solution, it helps to reduce the accumulation of heat inside the heating plate, thereby improving the heating efficiency. It also helps to reduce the thermal resistance between the heating element and the battery cell, so that heat can be transferred to the battery cell more quickly, ensuring that the heat can be evenly distributed on the outside and inside of the battery cell module.

[0010] Furthermore, a U-shaped bending portion is provided in the inner layer heating plate, and the U-shaped bending portion is arranged to fit around two rows of battery cells.

[0011] By adopting the above solution, the introduction of the U-shaped bend does not increase the complexity of the heating module. On the contrary, by simplifying the structure and layout of the heating plate, the entire heating module is made more compact and efficient, and it helps to achieve uniform heating of multiple rows of battery cells using a single heating plate.

[0012] Furthermore, the outer heating plate and the inner heating plate are spaced apart.

[0013] By adopting this solution, thermal interference between heating elements can be effectively avoided, allowing each heater to operate independently and effectively. This design ensures uniform heat distribution within the battery pack, reduces cross-talk and overlap between heating elements, thereby reducing local overheating or low temperatures, and thus improving heating uniformity within the battery pack.

[0014] Furthermore, the width of the outer heating plate is consistent with the width of the inner heating plate, and the width of the outer heating plate and the width of the inner heating plate are not longer than the height of the side wall of the battery cell.

[0015] By adopting this solution, the heating sheet's width matches the height of the cell's sidewalls, allowing it to precisely fit against the cell's sidewalls, ensuring direct and efficient heat transfer to the cell. This precise fit reduces heat waste and improves heating efficiency.

[0016] Furthermore, the outer heating plate and the inner heating plate are connected in parallel.

[0017] By adopting the above solution, the power supply can be independently received, so the heating power and temperature of each heating plate can be independently controlled. This independence makes the heating process more flexible and controllable, and the heating effect can be adjusted according to actual needs.

[0018] Furthermore, the heating power of the outer heating plate is not lower than the heating power of the inner heating plate.

[0019] By adopting this solution, the high heating power of the outer heating plate enables the battery pack to quickly heat up during the initial heating phase. This is particularly important for quickly starting the battery system in cold environments, as rapid preheating can reduce battery performance losses in low temperatures.

[0020] A battery pack includes a battery shell and a battery module arranged in the battery shell, wherein the battery cell module is provided in at least one group, and each group of the battery cell modules is provided with the outer heating plate and the inner heating plate.

[0021] By adopting the above solution, the coordinated heating of the inner and outer heating plates can ensure that the battery pack can still maintain high performance and charging efficiency in a low temperature environment.

[0022] Furthermore, the battery cell module is provided with two layers, and the outer layer heating plate and the inner layer heating plate in each layer of the battery cell module are connected in parallel.

[0023] By adopting the above solution, the detachable design of the double-layer shell makes it easy to maintain and inspect the interior of the battery, and facilitates the replacement of the battery cell module or heating module.

[0024] Furthermore, the battery shell includes a first shell layer and a second shell layer, the first shell layer and the second shell layer are detachably connected, the first shell layer includes a first shell upper cover and a first shell base, the first shell upper cover and the first shell base are snap-fitted together, and the second shell layer includes a second shell upper cover and a second shell base, the second shell upper cover and the second shell base are snap-fitted together.

[0025] By adopting the above solution, the double-layer shell structure provides better structural strength and sealing, which helps to protect the battery from external impact and pollution.

[0026] In summary, the battery module and battery pack provided by the present invention have the following technical effects:

[0027] 1. The battery module combines inner and outer heating plates to heat both the inside and outside of the cell module simultaneously. This design significantly improves heating uniformity, effectively avoiding local overheating or low temperatures, thereby ensuring the performance and safety of the battery pack in low-temperature environments.

[0028] 2. The U-shaped bend design also improves heating efficiency, allowing heat to be evenly distributed on the outside and inside of the battery module;

[0029] 3. The battery module uses a relatively simple physical structure to achieve heating, thereby reducing complexity and cost;

[0030] 4. The combined use of inner and outer heating elements ensures rapid preheating of the battery pack in low-temperature environments, thereby avoiding performance degradation and safety risks caused by battery overcooling. In addition, the independent control of the heating module also improves the safety of the battery pack;

[0031] 5. The double-layer shell design of the battery pack makes it easy to maintain and inspect the battery interior. At the same time, the parallel design of the heating modules allows each heating element to work independently, making it easy to replace and repair. The double-layer shell structure provides better structural strength and sealing, helping to protect the battery from external impact and contamination;

[0032] 6. The design of battery modules and battery packs can be adjusted and expanded according to the needs of different application scenarios, with higher expansion options. For example, the number of battery modules and heating plates can be increased or decreased to meet different capacity requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the top structure of an embodiment of the utility model;

[0034] Figure 2 This is a schematic diagram of a partial explosion structure of an embodiment of the present utility model;

[0035] Figure 3 This is a schematic diagram of the battery pack structure of an embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of the internal structure of the first shell of an embodiment of the utility model;

[0037] Figure 5 This is a schematic diagram of the internal structure of the second shell of an embodiment of the utility model;

[0038] Figure 6 This is a schematic diagram of the wiring structure of the internal heating plate of the battery pack according to an embodiment of the present utility model.

[0039] Among them, the meanings of the figure marks are as follows: 1. battery cell module; 11. battery cell; 111. outer battery cell; 112. inner battery cell; 2. outer heating plate; 21. first starting end; 22. first ending end; 3. inner heating plate; 31. second starting end; 32. second ending end; 33. U-shaped bending portion; 4. charger; 5. battery casing; 51. first casing; 511. first casing upper cover; 512. first casing base; 52. second casing; 521. second casing upper cover; 522. second casing base. DETAILED DESCRIPTION

[0040] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In order to facilitate the understanding of the embodiments of the present invention, the following will be further explained with reference to specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0044] Example 1 of the present utility model is shown in FIG. Figure 1-Figure 2 As shown, a battery module is disclosed, including a battery cell module 1, an outer heating plate 2 and an inner heating plate 3, the battery cell module 1 including a plurality of battery cells 11, preferably, the battery cells 11 are spaced apart from each other; the battery cells 11 are arranged in multiple rows and columns, the outer heating plate 2 is wound around the outer edge of the battery cell module 1, so the battery cells 11 that can contact the outer heating plate 2 are set as outer battery cells 111, and the remaining battery cells 11 are all inner battery cells 112, the inner heating plate 3 is wound inside the battery cell module 1, and is used to wind the inner battery cells 112, and the inner heating plate 3 is in contact with the side walls of the battery cells 11 not contacted by the outer heating plate 2; wherein, each battery cell 11 in the battery cell module 1 is in contact with the outer heating plate 2 and / or the inner heating plate 3, so as to achieve simultaneous heating of the inner and outer sides of the battery cell module 1. Compared with traditional single heating elements, this heating method can more effectively improve heating uniformity and reduce local overheating or low temperature problems; similarly, it uses a simpler physical structure to achieve heating, reducing complexity and cost.

[0045] In a specific embodiment, the outer heating plate 2 includes a first starting end 21 and a first tail end 22. The first starting end 21 starts from an outer battery cell 111 at one end of the battery cell module 1, and then wraps around the outside of the battery cell module 1. The outer heating plate 2 is in a straightened state. The first tail end 22 stops at the previous outer battery cell 111 of the outer battery cell 111 that contacts the first starting end 21, and bends inward. It can be directly attached to the outer battery cell 111, or it can be attached to the inner battery cell 112. The inner heating plate 3 includes a second starting end 31 and a second tail end 32. The second starting end 31 starts from the inner layer battery cell 11 close to the outer layer battery cell 111 and is wound along the length direction of the battery module. When it reaches the outer layer battery cell 111 at the end of the battery module, it stops and is bent from the last inner layer battery cell 112 at the end to form a U-shaped bending portion 33. The U-shaped bending portion 33 is arranged to fit and wind two rows of battery cells 11, and then is wound again along the length direction of the battery module until it reaches the outer layer battery cell 111 at the end of the battery module again. The U-shaped bending portion 33 is continued to be wound around the inner layer battery cell 112 at the end until all the inner layer battery cells 112 are completely wound. The second tail end 32 can be wound around the inner layer battery cell 112 or can be attached to the outer layer battery cell 11.

[0046] It should be noted that the first starting end 21 and the first tail end 22 are spaced apart, the two are not connected, and the two are located on different battery cells 11. Similarly, the second starting end 31 and the second tail end 32 are spaced apart, the two are not connected, and the two are located on different battery cells 11. The outer heating plate 2 and the inner heating plate 3 are spaced apart, which can effectively avoid thermal interference between the heating elements, so that each heating plate can work independently and effectively. In summary, the design of the outer heating plate 2 and the inner heating plate 3 helps to reduce the accumulation of heat inside the heating plate, thereby improving the heating efficiency, reducing the intersection and overlap between the heating elements, thereby reducing local overheating or low temperature, thereby improving the heating uniformity of the battery pack, and also helps to reduce the thermal resistance between the heating element and the battery cell 11, so that heat can be transferred to the battery cell 11 more quickly, ensuring that the heat can be evenly distributed on the outside and inside of the battery cell module 1.

[0047] In some embodiments, optionally, the width of the outer heating plate 2 is consistent with the width of the inner heating plate 3, and the width of the outer heating plate 2 and the width of the inner heating plate 3 are no longer than the height of the side wall of the battery cell 11. Preferably, the width of the outer heating plate 2 and the width of the inner heating plate 3 are less than the height of the side wall of the battery cell 11. This precise matching reduces heat waste and improves heating efficiency.

[0048] In order to enable the outer heating plate 2 and the inner heating plate 3 to operate independently, in this embodiment 1, the outer heating plate 2 and the inner heating plate 3 are arranged in parallel and connected to the same charger 4, and are directly powered by the voltage originally used to charge the battery pack. This independence makes the heating process more flexible and controllable, and the heating effect can be adjusted according to actual needs.

[0049] Preferably, the heating power of the outer heating sheet 2 is not less than that of the inner heating sheet 3. The high heating power of the outer heating sheet 2 allows the battery pack to quickly heat up during the initial heating phase. Because the outer battery cells 11 are more affected by the external low temperature environment than the inner battery cells 11, if the power is the same, the outer battery cells 11 will heat up much more slowly than the inner battery cells 11. Therefore, setting the power of the outer heating sheet 2 to be greater than that of the inner heating sheet 3 can cope with cold environments.

[0050] See Figure 3-6 As shown, the utility model also relates to a battery pack, comprising a battery housing 5 and a battery module arranged in the battery housing 5, wherein the battery cell module 1 is provided with at least one group, and each group of the battery cell module 1 is provided with the outer heating plate 2 and the inner heating plate 3. Through the coordinated heating of the inner and outer heating plates 2, it can be ensured that the battery pack can still maintain high performance and charging efficiency in a low temperature environment.

[0051] In a specific embodiment, the battery pack adopts a double-layer battery pack, so the battery module 1 is provided with two layers, the battery shell 5 includes a first shell 51 and a second shell 52, and the first shell 51 and the second shell 52 are detachably connected. Preferably, the first shell and the second shell 52 are snap-fitted together. The first shell 51 includes a first shell cover 511 and a first shell base 512, and the first shell cover 511 and the first shell base 512 are snap-fitted together. Preferably, the first shell cover 511 and the first shell base 512 are locked together by screws and studs; the second shell 52 includes a second shell cover 521 and a second shell base 522, and the second shell cover 521 and the second shell base 522 are snap-fitted together. Preferably, the second shell cover 521 and the second shell base 522 are locked together by screws and studs. The outer heating plate 2 and the inner heating plate 3 in each layer of the battery module 1 are connected in parallel and are all connected to a charger 4.

[0052] In this embodiment 1, the battery module in the first layer of the outer shell 51 contains three strings of battery cells 11, and the battery module in the second layer of the outer shell 52 contains four strings of battery cells 11, so the battery pack consists of 7 strings and 18 parallels. The spacing between the battery cells 11 in each battery module is 3.3 mm, and the battery cells 11 in each row are staggered. Since the number of battery cells 11 in the two layers of battery modules is inconsistent, the specifications of the heating plates are also different. Specifically, in the battery module in the first layer of the outer shell 51, the power of the outer heating plate 2 is 70w, and the power of the inner heating plate 3 is 60w; in the battery module in the second layer of the outer shell 52, the power of the outer heating plate 2 is 85w, and the power of the inner heating plate 3 is 80w. The charger 4 adopts the specification of 25V / 300W. Preferably, the heating efficiency of the outer heating plate 2 is 2.3 times the heating efficiency of the inner heating plate 3. Optionally, the inner heating plate 3 and the outer heating plate 2 are both made of PI film combined with copper wire. In other embodiments, the specific structure and material of the inner heating plate 3 and the outer heating plate 2 are not limited.

[0053] In summary, the battery module and battery pack provided by the present invention have the following technical effects:

[0054] 1. The battery module combines inner and outer heating plates 2 to simultaneously heat the inside and outside of the cell module 1. This design significantly improves heating uniformity, effectively avoiding local overheating or low temperatures, thereby ensuring the performance and safety of the battery pack in low-temperature environments.

[0055] 2. The design of the U-shaped bend 33 also improves heating efficiency, allowing heat to be evenly distributed on the outside and inside of the battery module 1;

[0056] 3. The battery module uses a relatively simple physical structure to achieve heating, thereby reducing complexity and cost

[0057] 4. The combined use of inner and outer heating sheets 2 ensures rapid preheating of the battery pack in low-temperature environments, thereby avoiding performance degradation and safety risks caused by battery overcooling. In addition, the independent control of the heating modules also improves the safety of the battery pack;

[0058] 5. The double-layer shell design of the battery pack makes it easy to maintain and inspect the battery interior. At the same time, the parallel design of the heating modules allows each heating element to work independently, making it easy to replace and repair. The double-layer shell structure provides better structural strength and sealing, helping to protect the battery from external impact and contamination;

[0059] 6. The design of the battery module and battery pack can be adjusted and expanded according to the needs of different application scenarios, and the expansion items are higher. For example, the number of battery modules 1 and heating plates can be increased or decreased to meet the needs of different capacities.

[0060] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A battery module, characterized in that: include: A battery cell module (1), wherein the battery cell module (1) includes a plurality of battery cells (11); An outer heating plate (2), the outer heating plate (2) being wound around the outer edge of the battery core module (1); An inner layer heating plate (3), the inner layer heating plate (3) being wound inside the battery core module (1); Wherein, each battery cell (11) in the battery cell module (1) is in contact with the outer heating plate (2) and / or the inner heating plate (3).

2. A battery module according to claim 1, characterized in that: The outer layer heating plate (2) comprises a first starting end (21) and a first tail end (22); the inner layer heating plate (3) comprises a second starting end (31) and a second tail end (32); the first starting end (21) and the first tail end (22) are spaced apart and are located on different battery cells (11); the second starting end (31) and the second tail end (32) are spaced apart and are located on different battery cells (11).

3. The battery module according to claim 1, characterized in that: A U-shaped bending portion (33) is provided in the inner layer heating plate (3), and the U-shaped bending portion (33) is arranged to fit around two rows of battery cells (11).

4. The battery module according to claim 1, characterized in that: The outer layer heating plate (2) and the inner layer heating plate (3) are arranged at intervals.

5. The battery module according to claim 1, characterized in that: The width of the outer heating plate (2) is consistent with the width of the inner heating plate (3), and the width of the outer heating plate (2) and the width of the inner heating plate (3) are not longer than the height of the side wall of the battery core (11).

6. The battery module according to claim 1, characterized in that: The outer layer heating plate (2) and the inner layer heating plate (3) are connected in parallel.

7. The battery module according to claim 1, characterized in that: The heating power of the outer layer heating plate (2) is not lower than the heating power of the inner layer heating plate (3).

8. A battery pack, characterized in that: A battery module according to any one of claims 1 to 7, comprising a battery housing (5) and being arranged in the battery housing (5), wherein at least one group of battery cell modules (1) is provided, and each group of battery cell modules (1) is provided with the outer heating plate (2) and the inner heating plate (3).

9. The battery pack according to claim 8, characterized in that: The battery core module (1) is provided with two layers, and the outer layer heating plate (2) and the inner layer heating plate (3) in each layer of the battery core module (1) are connected in parallel.

10. The battery pack according to claim 8, characterized in that: The battery housing (5) comprises a first housing (51) and a second housing (52), wherein the first housing (51) and the second housing (52) are detachably connected, the first housing (51) comprises a first housing upper cover (511) and a first housing base (512), wherein the first housing upper cover (511) and the first housing base (512) are buckled together, and the second housing (52) comprises a second housing upper cover (521) and a second housing base (522), wherein the second housing upper cover (521) and the second housing base (522) are buckled together.

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