Battery pack

Abstract

The utility model provides a battery pack which comprises a box body provided with an accommodating space; the beam is positioned in the box body and divides the accommodating space into at least one sub-accommodating space; the battery pack is arranged in the sub-accommodating space; the heating piece is arranged between the side surface of the battery pack and the beam; and the temperature equalizing piece is arranged between the heating piece and the beam and extrudes the heating piece so as to keep the heating piece in contact with the battery pack. The utility model solves the problem in the prior art that the heating film is failed to adhere to the battery due to the expansion force of the battery.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and more specifically, to a battery pack. Background Technology

[0002] In the battery field, batteries are affected by ambient temperature, especially at low temperatures where their charging and discharging capabilities are significantly reduced. Therefore, batteries need to be heated in low-temperature environments to maintain their optimal operating temperature. There are various methods for battery heating, including liquid heating, heating plate heating, and heating film heating. Among these, heating film heating has advantages such as high efficiency, good temperature uniformity, and light weight, and is therefore more widely used in power battery systems. However, due to battery expansion, the heating film can fail to adhere to the battery, leading to dry burning and potentially thermal runaway accidents. Utility Model Content

[0003] The main objective of this invention is to provide a battery pack that solves the problem of battery failure caused by battery expansion in the prior art.

[0004] To achieve the above objectives, this utility model provides a battery pack, comprising: a housing having a receiving space; a beam located inside the housing and dividing the receiving space into at least one sub-receiving space; a battery pack disposed within the sub-receiving space; a heating element disposed between the side of the battery pack and the beam; and a temperature equalization element disposed between the heating element and the beam, which presses against the heating element to keep it in contact with the battery pack.

[0005] Furthermore, the temperature equalization element has a bent structure that extends toward or away from the heating element, and the surfaces on opposite sides of the temperature equalization element abut against the heating element and the beam, respectively.

[0006] Furthermore, the bent structure includes at least one of a broken line and an arc.

[0007] Furthermore, the battery pack includes multiple batteries arranged sequentially along a first direction, and the bending structure is bent along the first direction, with the resulting crease line perpendicular to the first direction.

[0008] Furthermore, the surface of the heat spreader facing the heating element has a protrusion and a recess, the projection of the protrusion on the side of the battery pack is located within the range of at least one battery side, and the projection of the recess on the side of the battery pack spans at least two batteries.

[0009] Furthermore, the projection of the protrusion on the side of the battery pack is within the range of the side of a single battery. There are multiple protrusions, and each protrusion corresponds to a battery.

[0010] Furthermore, the battery pack also includes foam, which is disposed between the temperature equalizer and the heating element.

[0011] Furthermore, the surface of the foam facing the heating element has a first adhesive layer, through which the foam is bonded to the heating element.

[0012] Furthermore, the surface of the heating element facing the battery pack has a second adhesive layer, and the heating element is bonded to the side of the battery pack through the second adhesive layer.

[0013] Furthermore, there are multiple battery packs arranged along the second direction within the sub-accommodation space. Along the second direction, heating elements and temperature equalization elements are provided between the sides of the two battery packs located at the ends that are far apart from each other and the beam.

[0014] By applying the technical solution of this utility model, a heating element is provided on the side of the battery pack, enabling the heating element to heat the battery pack. Since the temperature equalization element is located between the beam and the heating element, it maintains constant contact and compression with the heating element, providing a force that keeps the heating element firmly attached to the side of the battery pack. This prevents the heating element from detaching, ensuring stable and reliable heating and preventing dry burning or even safety accidents. This arrangement, on the one hand, allows the heating element to heat the battery pack, improving the charge and discharge performance of the battery pack in low-temperature environments; on the other hand, the force applied to the heating element by the temperature equalization element ensures that the heating element maintains contact and fit with the battery pack, preventing dry burning due to heating element detachment caused by battery expansion, and ensuring continuous and uniform heating of the battery pack. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A top view of the overall structure of the battery pack of this utility model is shown;

[0017] Figure 2 It shows Figure 1 Enlarged view of the temperature equalization element.

[0018] The above figures include the following reference numerals:

[0019] 10. Housing; 20. Battery pack; 21. Battery; 30. Heating element; 40. Temperature equalization element; 41. Protrusion; 42. Recess; 50. Foam; 60. Beam. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0023] To address the problem in existing battery packs where battery expansion leads to failure of the heating element and battery adhesion, resulting in dry burning and potentially thermal runaway accidents, this invention provides a battery pack.

[0024] like Figure 1 and Figure 2 The battery pack shown includes: a housing 10, a beam 60, a battery pack 20, a heating element 30, and a temperature equalizer 40. The housing 10 has a receiving space; the beam 60 is located inside the housing 10 and divides the receiving space into at least one sub-receiving space; the battery pack 20 is disposed in the sub-receiving space; the heating element 30 is disposed between the side of the battery pack 20 and the beam 60; the temperature equalizer 40 is disposed between the heating element 30 and the beam 60 and presses the heating element 30 to keep the heating element 30 in contact with the battery pack 20.

[0025] In this embodiment, a heating element 30 is provided on the side of the battery pack 20, enabling the heating element 30 to heat the battery pack 20. Since the temperature equalization element 40 is located between the beam 60 and the heating element 30, the temperature equalization element 40 maintains constant contact and compression with the heating element 30, thus applying a force to the heating element 30 to the side of the battery pack 20. This ensures that the heating element 30 remains firmly attached to the battery pack 20, preventing it from detaching and ensuring stable and reliable heating, preventing dry burning or even safety accidents. This arrangement, on the one hand, allows the heating element 30 to heat the battery pack 20, improving its charge and discharge performance in low-temperature environments; on the other hand, the force applied by the temperature equalization element 40 to the heating element 30 maintains contact and engagement with the battery pack 20, preventing dry burning caused by the expansion of the battery 21 and ensuring continuous and uniform heating of the battery pack 20.

[0026] like Figure 1 and Figure 2As shown, in this embodiment, the heat spreader 40 has a bent structure. The bent structure extends towards or away from the heating element 30, and the surfaces on opposite sides of the heat spreader 40 abut against the inner walls of the heating element 30 and the beam 60, respectively. The bent structure is designed because it resists bending deformation more effectively than a flat, non-bent structure. When the battery pack 20 expands, the expansion force acts on the bent structure. Due to the structural characteristics of the bent structure, it deforms, absorbing some of the expansion force of the battery pack 20. This reduces the impact of the battery pack 20's expansion on components such as the beam 60 and the housing 10. Simultaneously, the deformed heat spreader 40 tends to recover its shape, thus enhancing its force application to the heating element 30 and ensuring that the heating element 30 remains in close contact with the side of the battery pack 20. On the other hand, the temperature equalizer 40 is disposed between the heating element 30 and the inner wall of the beam 60, and abuts against both the heating element 30 and the inner wall of the beam 60. This allows the inner wall of the beam 60 to better support the temperature equalizer 40, the heating element 30, and the battery pack 20, ensuring the strength of the fit between these components. Alternatively, the temperature equalizer 40 can be configured as a non-bent planar structure. In this case, the temperature equalizer 40 can be made thicker, thus also offsetting some of the expansion force of the battery pack 20.

[0027] Optionally, the material of the temperature equalization element 40 can be a high-strength metal or a non-metal.

[0028] like Figure 2 As shown, the bending structure in this embodiment includes at least one of a broken line and an arc. Specifically, the bending form of the bending structure can be a simple broken line, a simple arc, or a combination of broken lines and arcs. No specific limitation is made to the bending form; this embodiment uses a broken line bending structure. The broken line bending structure is easier to process, with lower processing difficulty and precision requirements, thus helping to reduce costs. Furthermore, compared to an arc-shaped structure, the bent structure can withstand more expansion force, improving the absorption of battery pack 20 expansion.

[0029] like Figure 1As shown, in this embodiment, the battery pack 20 includes multiple batteries 21, which are arranged sequentially along a first direction, which is essentially the length direction of the battery pack 20. The bending structure bends along the first direction, and the resulting crease line is perpendicular to the first direction. The reason for adopting the setting that the bending direction of the bending structure is the same as the arrangement direction of the batteries 21 is that when the batteries 21 expand, the sides of the batteries 21 expand almost as a whole. However, the degree of expansion may vary for different batteries. With the setting method described above in this embodiment, when some batteries 21 expand significantly, the bending segment corresponding to that battery 21 can deform accordingly, and the impact on other bending segments is relatively small. This makes the setting of the bending structure match the expansion of the batteries 21, improving the absorption of expansion force while ensuring that the heating element 30 is subjected to force. Meanwhile, the above-mentioned arrangement also ensures that the temperature equalization element 40 can evenly cover the side surface of each battery 21, avoiding local overheating or overcooling, and preventing temperature differences between batteries 21. This further improves the overall heating efficiency and temperature uniformity of the battery pack, ensuring battery charging and discharging performance and range. Of course, in addition to bending along the first direction, the bending structure can also be bent along a direction parallel to the side surface of the battery 21 and perpendicular to the first direction, i.e., according to... Figure 2 In the direction of the bending structure, the bending structure bends along the inside and outside directions.

[0030] like Figure 2 As shown, in this embodiment, the surface of the temperature equalizer 40 facing the heating element 30 has a protrusion 41 and a recess 42. The projection of the protrusion 41 on the side of the battery pack 20 is located within the range of the side of at least one battery 21, and the projection of the recess 42 on the side of the battery pack 20 spans at least two batteries 21. In this embodiment, it is preferable that the projection of the protrusion 41 on the side of the battery pack 20 is located within the range of the side of a single battery 21. There are multiple protrusions 41, and each protrusion 41 is correspondingly arranged with a battery 21. That is, each protrusion 41 is correspondingly arranged with one battery 21, and the protrusions 41, that is, the contact surface of the battery 21, are transitioned by the recess 42. In this way, when one battery 21 expands, the expansion force of that battery 21 acts almost entirely on the corresponding protrusion 41, causing that protrusion 41 to deform, while the other protrusions 41 remain largely unaffected. Thus, the expansion of each battery 21 and its corresponding protrusion 41 are self-adapted, ensuring effective absorption of the expansion force of the battery pack 20. Simultaneously, this arrangement also increases the connection strength between pairs of batteries 21 in the first direction, resulting in a tighter and more reliable fit between the batteries, further enhancing the structural reliability of the battery pack 20 and ensuring it can withstand greater stress deformation when the batteries deform due to heat.

[0031] Of course, besides the one-to-one correspondence arrangement described above, a single protrusion 41 can also cover the sides of multiple batteries 21 simultaneously. Similarly, a recess 42 can also cover the sides of multiple batteries 21 simultaneously, but its effect in absorbing expansion force and applying force to the heating element 30 will be reduced. Alternatively, multiple protrusions 41 can be provided on the side of a single battery 21, so that multiple protrusions 41 correspond to a single battery 21.

[0032] In general, the bending structure of this embodiment is formed by bending from the end of the bending structure toward the direction of the battery pack 20 until it contacts the heating element 30, then turning about 90 degrees and continuing to extend a short distance along the length of the battery pack 20, forming a protrusion 41. Then the bending structure turns about 90 degrees and extends away from the battery pack 20 until it reaches the inner wall of the beam 60. Then it bends about 90 degrees again and continues to extend a short distance along the length of the battery pack 20. Then it bends 90 degrees again and extends toward the direction of the battery pack 20 until it reaches the heating element 30, thus forming a recess 42. This process is repeated so that the bending structure extends along the length of the battery pack 20, thereby continuously forming protrusions 41 and recesses 42 until the entire side of the battery pack 20 is covered.

[0033] like Figure 2 As shown, in this embodiment, the battery pack also includes foam 50, which is disposed between the temperature equalizer 40 and the heating element 30. By disposing of foam 50 between the temperature equalizer 40 and the heating element 30, it can not only absorb the vibration and impact of the battery pack 20 during operation, ensuring stable contact between the heating element 30 and the temperature equalizer 40 and reducing poor contact caused by vibration, but also enhance the heat conduction between the heating element 30 and the temperature equalizer 40, thereby improving heating efficiency.

[0034] In this embodiment, the surface of the foam 50 facing the heating element 30 has a first adhesive layer, through which the foam 50 is bonded to the heating element 30. This first adhesive layer ensures that the foam 50 is firmly fixed to the heating element 30, preventing displacement of the battery pack 20 during operation and improving the stability and safety of the battery pack. Furthermore, the bonding method is relatively simple, requiring no bolts, screw holes, or other structural elements, thus avoiding any structural impact on the battery 21, beam 60, or housing 10.

[0035] In this embodiment, in addition to the adhesive bonding between the foam 50 and the heating element 30, the heating element 30 and the battery pack 20 are also bonded together. Specifically, the surface of the heating element 30 facing the battery pack 20 has a second adhesive layer, and the heating element 30 is bonded to the surface of the battery pack 20 through the second adhesive layer. This second adhesive layer strengthens the fixation between the heating element 30 and the battery pack 20, ensuring close contact and improving heating efficiency. It also prevents the heating element 30 from detaching when the battery pack 20 expands, effectively avoiding damage to the heating element caused by dry burning. This improves the heating efficiency and temperature uniformity of the battery pack under high-load operating conditions, ensuring battery safety during operation. Of course, other connections, such as between the foam 50 and the temperature equalization element 40, can also be made using adhesive bonding.

[0036] like Figure 1 As shown, in this embodiment, there are multiple battery packs 20, which are arranged in the sub-accommodating space along the second direction. Along the second direction, heating elements 30 and temperature equalization elements 40 are provided between the sides of the two battery packs 20 located at the ends that are far apart from each other and the beam 60.

[0037] Specifically, multiple battery packs 20 can be arranged within the sub-accommodating space. The arrangement direction of the battery packs 20 can be a second direction perpendicular to the first direction, or other directions. Since there are cases where two battery packs 20 are adjacent, this embodiment does not provide heating elements 30 and temperature equalization elements 40 between two adjacent battery packs 20. Instead, heating elements 30 and temperature equalization elements 40 are only provided between the battery packs 20 and the inner wall of the beam 60. That is, heating elements 30 and temperature equalization elements 40 are provided on the sides of the two battery packs 20 closest to the inner wall of the beam 60 facing the inner wall of the beam 60. Figure 1 Taking a configuration of four battery packs 20 arranged in pairs as an example, the upper and lower sides of two battery packs 20 in the same group (according to...) Figure 1 A heating element 30 and a temperature equalizer 40 are provided between the inner wall of the beam 60 and the battery pack 20 (located in the center). This ensures the heating effect on the battery pack 20 without affecting the arrangement between the battery packs 20. Of course, the heating element 30 and the temperature equalizer 40 can also be provided between two adjacent battery packs 20.

[0038] Meanwhile, in this embodiment, the heating element 30 and the temperature equalization element 40 are only provided between the side of the battery pack 20 along its length and the inner wall of the beam 60, while the heating element 30 and the temperature equalization element 40 are not provided at the end face of the battery pack 20 along its length. Of course, the heating element 30 and the temperature equalization element 40 can also be provided at the end face of the battery pack 20.

[0039] As mentioned above, the internal space of the housing 10 is further divided into multiple sub-spaces by the beam 60. Each sub-space can house one or more battery packs. In this embodiment, four sub-spaces are provided, each housing two battery packs 20, resulting in a total of eight heating elements 30 and temperature equalization elements 40. Of course, the specific arrangement and quantity described above can be adjusted as needed and are not limited to the arrangement in this embodiment.

[0040] It should be noted that "multiple" in the above embodiments refers to at least two.

[0041] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0042] 1. This solves the problem in existing technologies where the heating film fails to adhere to the battery due to battery expansion;

[0043] 2. The heating element is located on the side of the battery pack. In extremely cold temperatures, the heating element can heat the battery pack to bring it to the optimal operating temperature, thereby improving the charging and discharging function of the battery pack.

[0044] 3. By applying force to the heating element through the temperature equalization element, the heating element can maintain contact and cooperation with the battery pack, avoiding the situation where the heating element will fall off and dry burn due to battery expansion, thus ensuring continuous and uniform heating of the battery pack.

[0045] 4. The bending structure of the heat spreader and the use of foam further enhance the contact stability between the heating element and the battery pack, avoiding the failure of the heating element to adhere to the battery due to battery expansion, resulting in dry burning and thermal runaway accidents. This improves the overall reliability and service life of the battery pack, and at the same time can absorb some of the battery expansion force, reducing the impact of battery pack expansion on components such as the casing.

[0046] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0049] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing (10) has a receiving space; A beam (60) is located inside the box (10) and divides the accommodating space into at least one sub-accommodating space; Battery pack (20), the battery pack (20) is disposed within the sub-accommodating space; A heating element (30) is disposed between the side of the battery pack (20) and the beam (60); A temperature equalizer (40) is disposed between the heating element (30) and the beam (60) and presses the heating element (30) to keep the heating element (30) in contact with the battery pack (20).

2. The battery pack according to claim 1, characterized in that, The temperature equalizer (40) has a bent structure that extends toward or away from the heating element (30), and the surfaces of the temperature equalizer (40) on opposite sides respectively abut against the heating element (30) and the beam (60).

3. The battery pack according to claim 2, characterized in that, The bending structure includes at least one of a broken line and an arc.

4. The battery pack according to claim 2, characterized in that, The battery pack (20) includes a plurality of batteries (21), which are arranged sequentially along a first direction. The bending structure is bent along the first direction, and the crease line formed is perpendicular to the first direction.

5. The battery pack according to claim 4, characterized in that, The surface of the heat exchanger (40) facing the heating element (30) has a protrusion (41) and a recess (42). The projection of the protrusion (41) on the side of the battery pack (20) is located within the range of at least one side of the battery (21), and the projection of the recess (42) on the side of the battery pack (20) spans at least two batteries (21).

6. The battery pack according to claim 5, characterized in that, The projection of the protrusion (41) on the side of the battery pack (20) is located within the range of the side of a single battery (21). There are multiple protrusions (41), and each protrusion (41) is provided in a one-to-one correspondence with a battery (21).

7. The battery pack according to any one of claims 1 to 6, characterized in that, The battery pack also includes foam (50), which is disposed between the temperature equalizer (40) and the heating element (30).

8. The battery pack according to claim 7, characterized in that, The surface of the foam (50) facing the heating element (30) has a first adhesive layer, and the foam (50) is bonded to the heating element (30) through the first adhesive layer.

9. The battery pack according to any one of claims 1 to 6, characterized in that, The heating element (30) has a second adhesive layer on its surface facing the battery pack (20), and the heating element (30) is bonded to the side of the battery pack (20) through the second adhesive layer.

10. The battery pack according to any one of claims 1 to 6, characterized in that, There are multiple battery packs (20), and the multiple battery packs (20) are arranged in the sub-accommodating space along the second direction. Along the second direction, the heating element (30) and the temperature equalization element (40) are provided between the sides of the two battery packs (20) located at the ends that are far away from each other and the beam (60).

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