Battery pack, vehicle body and vehicle

Abstract

The utility model relates to a battery pack, a vehicle body and a vehicle. The battery pack comprises a box body; the battery assembly comprises a plurality of single batteries, the single batteries are sequentially arranged in the first direction, each single battery comprises a shell and an end cover which are connected with each other, and the end covers are arranged at the ends, in the second direction, of the single batteries; the battery assembly is bonded with the box body in the third direction through the connecting glue unit, the connecting glue unit comprises middle connecting glue, the two ends, in the second direction, of the middle connecting glue are connected with edge connecting glue respectively, and the edge connecting glue continuously extends in the first direction; the first direction, the second direction and the third direction are perpendicular to one another in pairs. The battery pack can avoid weld joint cracking of the single batteries.

Description

Technical Field

[0001] This disclosure relates to the field of battery pack technology, specifically to a battery pack, a vehicle body, and a vehicle. Background Technology

[0002] In related technologies, battery packs include a housing and battery modules, with adhesive typically used to bond the battery modules to the housing. Currently, individual battery cells within the battery modules are prone to uneven stress, which can lead to cracking of their welds. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a battery pack that can prevent the weld seams of individual battery cells from cracking.

[0004] According to a first aspect of the present disclosure, a battery pack is provided, comprising:

[0005] Box;

[0006] A battery assembly includes multiple battery cells arranged sequentially along a first direction. Each battery cell includes an interconnected housing and an end cap, the end cap being disposed at an end of the battery cell along a second direction.

[0007] A bonding adhesive unit is provided, wherein the battery assembly is bonded to the housing in a third direction via the bonding adhesive unit. The bonding adhesive unit includes a central bonding adhesive, and the two ends of the central bonding adhesive along the second direction are respectively connected to edge bonding adhesives. The edge bonding adhesives extend continuously along the first direction and connect any two adjacent battery cells. The first direction, the second direction, and the third direction are perpendicular to each other.

[0008] Through the above technical solution, in the battery pack provided in this disclosure, the battery cells typically have welds at both ends along the second direction, i.e., welds are provided between the end cap and the casing. Therefore, when the end of the battery cell along the second direction is subjected to uneven stress, the weld of the battery cell is prone to cracking. Here, since the middle connecting adhesive is provided with edge connecting adhesives on both sides along the second direction, the edge connecting adhesives connect the ends of the battery cells in the second direction. By setting the edge connecting adhesives to extend continuously along the first direction, i.e., extending uninterruptedly along the first direction, the ends of any two adjacent battery cells can be connected by the edge connecting adhesives. This can balance the stress on the ends of each battery cell, thereby preventing the weld of the battery cell from cracking.

[0009] In some possible implementations, the edge bonding adhesive includes a main bonding adhesive and an auxiliary bonding adhesive connected together. The main bonding adhesive connects the housing and the battery cell. The battery cell has a support at its end along a second direction. The auxiliary bonding adhesive extends out of the battery cell along the second direction and connects between the housing and the support. Thus, the auxiliary bonding adhesive can connect the portion of the housing outside the battery cell, i.e., connect the housing and the support, thereby further improving the connection strength between the battery assembly and the housing.

[0010] In some possible implementations, a weld is provided between the housing and the end cap, and the main connecting adhesive and the auxiliary connecting adhesive jointly wrap the weld. This effectively protects the weld and further prevents weld cracking.

[0011] In some possible implementations, in the third direction, the bracket is located inside the weld, the edge bonding adhesive has a thickness in the third direction, and the thickness of the auxiliary bonding adhesive is greater than the thickness of the main bonding adhesive, so that the bend between the auxiliary bonding adhesive and the main bonding adhesive wraps around the weld. Thus, the bend formed by the thickness difference between the auxiliary bonding adhesive and the main bonding adhesive can be used to wrap the weld of the battery cell, resulting in a simple and easy-to-implement structure.

[0012] In some possible implementations, the battery assembly includes a protective cover, and the battery cells have electrode terminals at their ends along a second direction. The protective cover covers the electrode terminals and serves to limit contact between the edge bonding adhesive and the electrode terminals. Thus, the protective cover prevents contact between the electrode terminals and the edge bonding adhesive, for example, preventing the bonding adhesive from overflowing to the electrode terminals during the bonding process, thereby contaminating the electrode terminals or causing the bonding adhesive to become charged.

[0013] In some possible implementations, the protective cover overlaps the bracket and has a baffle plate extending from the bracket in a third direction. In this third direction, the baffle plate is positioned between the weld and the electrode terminal and is bonded to the auxiliary bonding adhesive. Thus, an adhesive-containing space is formed between the battery cell, the bracket, and the baffle plate to accommodate the auxiliary bonding adhesive. The baffle plate acts as a barrier, preventing the auxiliary bonding adhesive from overflowing from the bracket and thus preventing the edge bonding adhesive from contacting the electrode terminal.

[0014] In some possible implementations, the edge bonding adhesive has a width in the second direction, and the width of the edge bonding adhesive is at least 70mm to 90mm. This avoids the edge bonding adhesive being too narrow, which could affect the protective effect on the weld.

[0015] In some possible implementations, in the third direction, at least 90% to 95% of the projected area of ​​the battery assembly is covered by the connecting adhesive unit. This significantly improves the overall pack modality and effectively enhances the structural strength of the battery pack.

[0016] According to a second aspect of the present disclosure, a vehicle body is provided, including a battery pack as described above.

[0017] According to a third aspect of the present disclosure, a vehicle is provided, including a battery pack as described above or a vehicle body as described above.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] Figure 1 This is a partial structural schematic diagram of a battery pack provided according to an embodiment of this disclosure;

[0021] Figure 2 yes Figure 1 Enlarged view of section A;

[0022] Figure 3 This is a partial exploded view of the battery pack provided in an embodiment of this disclosure;

[0023] Figure 4 yes Figure 3 Enlarged view of section B;

[0024] Figure 5 This is a structural schematic diagram of the connecting adhesive unit in the battery pack according to an embodiment of the present disclosure;

[0025] Figure 6 yes Figure 5 Enlarged view of section C.

[0026] Explanation of reference numerals in the attached figures

[0027] 1-Box body, 2-Battery assembly, 21-Battery cell, 211-Weld, 212-Shell, 213-End cap, 214-Electrode terminal, 22-Bracket, 23-Protective cover, 231-Glue baffle, 3-Connecting glue unit, 31-Middle connecting glue, 311-Intermediate connecting glue, 312-Connecting glue strip, 32-Edge connecting glue, 321-Main connecting glue, 322-Auxiliary connecting glue. Detailed Implementation

[0028] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0029] In this disclosure, unless otherwise stated, directional terms such as "first direction," "second direction," and "third direction" are used for reference. Figure 1 and Figure 2 The first direction, the second direction, and the third direction are defined. "Inner" and "outer" refer to the inner and outer contours of each component itself. Furthermore, in the following description, when referring to accompanying drawings, the same reference numerals in different drawings denote the same or similar elements, which will not be repeated in this disclosure.

[0030] According to some embodiments of this disclosure, a battery pack is provided, with reference to... Figures 1 to 6 As shown, the battery pack includes: a housing 1; a battery assembly 2, including multiple battery cells 21, which are arranged sequentially along a first direction. Each battery cell 21 includes a shell 212 and an end cap 213 connected to each other. The end cap 213 is disposed at the end of the battery cell 21 along a second direction; and a bonding adhesive unit 3, which bonds the battery assembly 2 to the housing 1 in a third direction. The bonding adhesive unit 3 includes a central bonding adhesive 31, and the two ends of the central bonding adhesive 31 along the second direction are respectively connected to edge bonding adhesives 32. The edge bonding adhesives 32 extend continuously along the first direction and connect any two adjacent battery cells 21. The first direction, the second direction, and the third direction are perpendicular to each other.

[0031] Through the above technical solution, in the battery pack provided in this disclosure, the battery cell 21 typically has welds 211 at both ends along the second direction, that is, welds 211 are provided between the end cap 213 and the housing 212. Therefore, when the end of the battery cell 21 along the second direction is subjected to uneven force, the welds 211 of the battery cell 21 are prone to cracking. Here, since the middle connecting adhesive 31 has edge connecting adhesive 32 at both ends along the second direction, the edge connecting adhesive 32 connects the end of the battery cell 21 in the second direction. By setting the edge connecting adhesive 32 to extend continuously along the first direction, that is, to extend uninterruptedly along the first direction, the ends of any two adjacent battery cells 21 can be connected by the edge connecting adhesive 32. Thus, the force on the ends of each battery cell 21 can be balanced, thereby preventing the welds 211 of the battery cell 21 from cracking.

[0032] It should be noted that the edge connecting adhesive 32 extends continuously along the first direction. This can be understood as the edge connecting adhesive 32 extending uninterruptedly along the first direction without any cracks in the middle. Specifically, the edge connecting adhesive 32 may include a first adhesive that is directly connected to the battery cell 21 and a second adhesive disposed between two adjacent battery cells 21. The two adjacent first adhesives are connected by the second adhesive to achieve the continuous extension of the edge connecting adhesive 32. The advantage of this arrangement is that it can balance the force on the ends of each battery cell 21. The continuous edge connecting adhesive 32 can effectively prevent the weld seam 211 of the battery cell 21 from cracking after being subjected to vibration and impact, thereby improving the reliability of the battery pack. The continuous extension described below will not be explained in detail in this disclosure. In addition, the battery cell 21 may have a width in the first direction, a length in the second direction, and a height in the third direction. This disclosure does not limit this.

[0033] It should also be noted that the battery assembly 2 of this disclosure differs from a conventional battery module; it is an assembly of multiple battery cells 21, which can be easily integrated together using a bracket 22 or similar means. Furthermore, the battery cell 21 of this disclosure can be constructed as a "blade battery," which is well known to those skilled in the art and will not be described in detail here. Additionally, the bottom of the battery cell 21 can be connected to the housing 1 via a connecting adhesive unit 3.

[0034] In some embodiments of this disclosure, reference is made to Figures 1 to 6 As shown, the edge bonding adhesive 32 may include a main bonding adhesive 321 and an auxiliary bonding adhesive 322 connected together. The main bonding adhesive 321 can be connected between the housing 1 and the battery cell 21. The end of the battery cell 21 along the second direction may be provided with a bracket 22. The auxiliary bonding adhesive 322 can extend out of the battery cell 21 along the second direction and be connected between the housing 1 and the bracket 22. In this way, the auxiliary bonding adhesive 322 can be used to connect the part of the housing 1 outside the battery cell 21, that is, to connect the housing 1 and the bracket 22, thereby further improving the connection strength between the battery assembly 2 and the housing 1.

[0035] In some embodiments of this disclosure, reference is made to Figures 1 to 4 As shown, a weld 211 is provided between the housing 212 and the end cap 213. The main connecting adhesive 321 and the auxiliary connecting adhesive 322 can jointly wrap the weld 211. In this way, the edge connecting adhesive 32 can cover the weld 211. Thus, on the one hand, the weld 211 can be effectively protected, and on the other hand, the weld 211 can be further prevented from cracking.

[0036] In some implementations, reference Figure 2 and Figure 4As shown, in the third direction, the bracket 22 can be located inside the weld 211, that is, the bracket 22 and the weld 211 are spaced apart in the third direction, and the bracket 22 is set relatively inward. The edge connecting adhesive 32 has a thickness in the third direction, and the thickness of the auxiliary connecting adhesive 322 can be greater than the thickness of the main connecting adhesive 321, so that the bend between the auxiliary connecting adhesive 322 and the main connecting adhesive 321 can wrap the weld 211. In this way, the bend formed by the thickness difference between the auxiliary connecting adhesive 322 and the main connecting adhesive 321 can be used to wrap the weld 211 of the battery cell 21, which is simple in structure and easy to implement. The gap between the bracket 22 and the weld 211 of the battery cell 21 in the third direction allows the auxiliary connecting adhesive 322 to be made thicker.

[0037] In some embodiments, reference Figure 2 and Figure 4 As shown, the battery assembly 2 includes a protective cover 23. An electrode terminal 214 is provided at the end of the battery cell 21 along a second direction. The protective cover 23 covers the electrode terminal 214 and serves to limit contact between the edge bonding adhesive 32 and the electrode terminal 214. Thus, the protective cover 23 prevents the electrode terminal 214 from contacting the edge bonding adhesive 32, for example, preventing the bonding adhesive unit 3 from overflowing to the electrode terminal 214 during the bonding process, thereby contaminating the electrode terminal 214 or causing the bonding adhesive unit 3 to become charged.

[0038] In some embodiments, reference Figure 2 and Figure 4 As shown, the protective cover 23 can overlap the bracket 22 and has a baffle plate 231 extending from the bracket 22 in a third direction. This arrangement allows a space to be formed between the battery cell 21, the bracket 22, and the baffle plate 231 to accommodate the auxiliary connecting adhesive 322. In the third direction, the baffle plate 231 can be positioned between the weld 211 and the electrode terminal 214 and bonded to the auxiliary connecting adhesive 322. Here, when the third direction is the direction of gravity of the battery pack, and the housing 1 is positioned above the battery assembly 2 during the pressing process of the battery pack, the baffle plate 231 is positioned below the weld 211 and above the electrode terminal 214. In this way, during the pressing process, the space can accommodate the auxiliary connecting adhesive 322, and the baffle plate 231 can act as a baffle to prevent the auxiliary connecting adhesive 322 from overflowing from the bracket 22, thereby preventing the edge connecting adhesive 32 from contacting the electrode terminal 214.

[0039] In some embodiments of this disclosure, reference is made to Figure 5 and Figure 6As shown, the edge bonding adhesive 32 may have a width in the second direction, and the width of the edge bonding adhesive 32 is at least 70mm to 90mm, for example, it can be 80mm, and this disclosure does not limit it. In this way, the width of the edge bonding adhesive 32 can be avoided from being too small, which would affect the protection effect on the weld 211. In some embodiments, the edge bonding adhesive 32 here may include the above-mentioned main bonding adhesive 321 and auxiliary bonding adhesive 322.

[0040] In some embodiments of this disclosure, reference is made to Figures 1 to 4 As shown, in the third direction, at least 90% to 95% of the projected area of ​​the battery module 2 is covered by the bonding adhesive unit 3. This can significantly improve the overall pack mode and effectively enhance the structural strength of the battery pack. Of course, the bonding adhesive unit 3 of this disclosure also includes a portion located outside the projected area of ​​the battery module 2, such as the auxiliary bonding adhesive 322 mentioned above.

[0041] In some embodiments of this disclosure, reference is made to Figures 1 to 6 As shown, the central connecting adhesive 31 may include an intermediate connecting adhesive 311, which extends continuously along a first direction, i.e., extends uninterruptedly along the first direction and connects any two adjacent battery cells 21. The intermediate connecting adhesive 311 has a width in a second direction, and the battery cell 21 may have a length in the second direction. The ratio of the width of the intermediate connecting adhesive 311 to the length of the battery cell 21 is at least 70% to 80%, for example, it can be 74%. In this way, on the one hand, it can ensure the extent to which the projected area of ​​the battery assembly 2 is covered by the connecting adhesive unit 3 in a third direction, and on the other hand, it can ensure and improve the connection strength between the battery cell 21 and the housing 1.

[0042] In some embodiments of this disclosure, reference is made to Figures 1 to 6 As shown, the middle connecting adhesive 31 can be connected to multiple connecting adhesive strips 312 at both ends in the second direction. The connecting adhesive strips 312 connect the middle connecting adhesive 311 and the edge connecting adhesive 32. The multiple connecting adhesive strips 312 arranged on the same side can be arranged sequentially along the first direction. The connecting adhesive strips 312 can have a width in the first direction, and the battery cell 21 can have a width in the first direction. The ratio of the width of the connecting adhesive strip 312 to the width of the battery cell 21 can be at least 80% to ensure and improve the degree to which the projected area of ​​the battery assembly 2 is covered by the connecting adhesive unit 3 in the third direction.

[0043] In some embodiments, the connecting strip 312 may have a length in the second direction, and the ratio of the length of the connecting strip 312 to the length of the battery cell 21 may be less than or equal to 12% to 14%, for example, less than or equal to 13%, which is not limited in this disclosure.

[0044] In some implementations, reference Figure 5 and Figure 6 As shown, among the multiple connecting strips 312 arranged on the same side, adjacent connecting strips 312 can be arranged at intervals. Of course, in other embodiments, adjacent strips can also be at least partially connected together in the second direction, and this disclosure does not limit this.

[0045] According to a second aspect of the present disclosure, a vehicle body is provided, including the battery pack described above, which has all the beneficial effects of the battery pack described above, which will not be elaborated upon here.

[0046] In some embodiments, the battery pack may include a top cover (not shown in the figures), which can serve as the floor of the vehicle body. Thus, when the top cover of the battery pack is used as the floor of the vehicle body, the battery pack can be configured as a CTB (Cell to Body) battery pack.

[0047] According to a third aspect of the embodiments of this disclosure, a vehicle is provided, including the battery pack as described above or the vehicle body as described above. The vehicle has all the beneficial effects of the battery pack or vehicle body described above, which will not be elaborated upon here. In some embodiments, the vehicle of this disclosure may be a pure electric vehicle or a hybrid vehicle, and this disclosure does not limit this.

[0048] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0050] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery pack, characterized in that, include: Box; A battery assembly includes multiple battery cells arranged sequentially along a first direction. Each battery cell includes an interconnected housing and an end cap, the end cap being disposed at an end of the battery cell along a second direction. A bonding adhesive unit is provided, wherein the battery assembly is bonded to the housing in a third direction via the bonding adhesive unit. The bonding adhesive unit includes a central bonding adhesive, and the two ends of the central bonding adhesive along the second direction are respectively connected to edge bonding adhesives. The edge bonding adhesives extend continuously along the first direction and connect any two adjacent battery cells. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The battery pack according to claim 1, characterized in that, The edge connecting adhesive includes a main connecting adhesive and an auxiliary connecting adhesive connected together. The main connecting adhesive connects the casing and the battery cell. The battery cell has a bracket at its end along the second direction. The auxiliary connecting adhesive extends out of the battery cell along the second direction and connects the casing and the bracket.

3. The battery pack according to claim 2, characterized in that, A weld is provided between the housing and the end cap, and the main connecting adhesive and the auxiliary connecting adhesive together wrap the weld.

4. The battery pack according to claim 3, characterized in that, In the third direction, the bracket is located inside the weld, the edge bonding adhesive has a thickness in the third direction, and the thickness of the auxiliary bonding adhesive is greater than the thickness of the main bonding adhesive, so that the bend between the auxiliary bonding adhesive and the main bonding adhesive wraps the weld.

5. The battery pack according to any one of claims 1-4, characterized in that, The battery assembly includes a protective cover, and the battery cell has an electrode terminal at its end along a second direction. The protective cover is placed over the electrode terminal and is used to restrict the contact between the edge bonding adhesive and the electrode terminal.

6. The battery pack according to claim 5, characterized in that, The protective cover overlaps the bracket and has a baffle plate extending out of the bracket in a third direction. In the third direction, the baffle plate is disposed between the weld and the electrode terminal and is bonded to the auxiliary connecting adhesive.

7. The battery pack according to claim 1, characterized in that, The edge bonding adhesive has a width in the second direction, and the width of the edge bonding adhesive is at least 70mm to 90mm.

8. The battery pack according to claim 1, characterized in that, In the third direction, at least 90% to 95% of the projected area of ​​the battery assembly is covered by the connecting adhesive unit.

9. A vehicle body, characterized in that, Includes the battery pack as described in any one of claims 1-8.

10. A vehicle, characterized in that, This includes the battery pack as described in any one of claims 1-8 or the vehicle body as described in claim 9.

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