Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a box body, a battery module and a glue pouring structure, the battery module is located in the box body and connected to a bottom plate of the box body, the battery module comprises at least one battery monomer, and a first gap is formed between at least one end of a battery core mold in a first direction and a side plate of the box; the glue filling structure comprises a first glue filling part, and the first glue filling part is arranged in the first gap and is used for connecting the side plate and the battery module; wherein in the first direction, the width of the first glue pouring part is D1, the width of the battery monomer is D2, and D1 is smaller than D2. According to the battery pack provided by the invention, the battery module is connected with the side plate of the box body through the first glue pouring part, and the battery module, the first glue pouring part and the side plate of the box body are matched with one another, so that a force transmission path can be formed, the acting force acting on the battery pack can be jointly transmitted, and the rigidity and modality of the whole battery pack are improved; and the safety and durability of the battery pack can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] Battery packs are devices used to provide energy to electrical equipment (such as vehicles) and are core components of such equipment. Improving the stiffness and modal characteristics of battery packs has become a research focus. Utility Model Content

[0003] This disclosure provides a battery pack and an electrical device that at least partially overcomes the problems existing in the related art.

[0004] According to a first aspect of this disclosure, a battery pack is provided, including a housing, a battery module, and a potting structure;

[0005] The battery module is located inside the housing and connected to the bottom plate of the housing. The battery module includes at least one battery cell, and there is a first gap between at least one end of the battery module in a first direction and the side plate of the housing.

[0006] The potting structure includes a first potting section, which is disposed in the first gap and is used to connect the side plate and the battery module.

[0007] In the first direction, the width of the first potting portion is D1, and the width of the battery cell is D2, wherein D1 is smaller than D2.

[0008] Optionally, D1 and D2 satisfy: <0.7.

[0009] Optionally, the height of the first potting portion is H1, and the height of the battery module is H2, wherein H1 and H2 satisfy: 0.25

[0010] Optionally, the height of the first potting portion is H1, and the height of the battery module is H2;

[0011] When D2 < 300 mm, H1, H2, D1, and D2 satisfy: 0.65 < <25;

[0012] When D2 ≥ 300 mm, H1, H2, D1, and D2 satisfy: 0.65 < <25;

[0013] Where E is the DMA modulus of the first potting portion, and M is the mass of the battery module.

[0014] ​Optionally, the E satisfies: E≥30Mpa.

[0015] Optionally, the box comprises two side plates arranged at intervals in the first direction;

[0016] The battery module has the first gap between both ends in the first direction and the corresponding side plates, and each of the first gaps is provided with the first glue-filling part;

[0017] The battery module has a second gap between at least one end in the second direction and the side plate of the box;

[0018] The glue-filling structure further comprises a second glue-filling part, and the second glue-filling part is arranged in the second gap, and the second direction intersects the first direction.

[0019] Optionally, the two first gaps and the two second gaps are connected to form a ring gap, and the two first glue-filling parts and the two second glue-filling parts are connected to form a ring glue-filling part.

[0020] Optionally, the battery pack further comprises a battery management module, and the battery management module is arranged at one end of the battery module in the first direction and in the first gap;

[0021] The battery management module is provided with an electrical connection part for connecting with the battery module, and the height of the first glue-filling part is lower than the height of the electrical connection part.

[0022] Optionally, the electrical connection part comprises an electrical connection port at the upper end of the battery management module.

[0023] The battery pack further comprises a shielding piece, and the shielding piece covers the upper end of the battery management module, and the shielding piece is used for shielding the electrical connection port.

[0024] Optionally, the first glue-filling part uses foaming glue, and the foaming glue has a first density ρ1, and the first density ρ1 is the density of the foaming glue after foaming;

[0025] Wherein, the first density ρ1 satisfies: ρ1≤0.4 g / cm 3 .

[0026] Optionally, the box further comprises an upper cover, and the upper cover is arranged at the upper end of the side plate;

[0027] The glue-filling structure further comprises a third glue-filling part, and the upper end of the battery module is bonded to the upper cover through the third glue-filling part.

[0028] According to a second aspect of the present disclosure, a power consuming device is provided, comprising a device body and a battery pack as described above, the battery pack being mounted to the device body and configured to supply power to the device body.

[0029] Optionally, the power consuming device is a vehicle, and a portion of a vehicle body of the vehicle is configured as an upper cover of the box, the upper cover being arranged at an upper end of the side plate.

[0030] According to the above technical solution, since the bottom of the battery module is connected to the bottom plate, and the first glue filling part is arranged in the first gap between the side plate of the box and the battery module, in the battery pack provided by the present disclosure, the battery module is connected to the bottom plate of the box of the battery pack, and the battery module can also be connected to the side plate of the box through the first glue filling part. In this way, on the one hand, the cured glue can provide support for the battery module, so that the fixing effect of the battery module in the box is good, and the battery module is not easy to shake during use; on the other hand, compared with the implementation in the related art in which the battery module and the side plate are provided with foam, the battery pack provided by the present disclosure connects the battery module and the side plate of the box through the first glue filling part, and the battery module, the first glue filling part and the side plate of the box cooperate with each other to form a force transmission path, so as to be able to jointly transmit the force acting on the battery pack, improve the rigidity, strength and modal of the entire battery pack, and be beneficial to improving the safety and durability of the battery pack.

[0031] In addition, because the glue solution has fluidity, by filling glue in the first gap, the glue solution can uniformly fill the first gap, and by injecting a preset amount of glue solution into the first gap, the glue solution can fill the first gap according to the preset filling height, which is beneficial to overcoming the manufacturing and assembly errors of various components of the battery pack.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] Figure 1 is a perspective view of a partial structure of a battery pack provided by an exemplary embodiment of the present disclosure.

[0035] Figure 2 is Figure 1 is an enlarged view of A in FIG.

[0036] Figure 3 is a perspective view of a partial structure of a battery pack provided by an exemplary embodiment of the present disclosure, wherein the upper cover is not shown.

[0037] Figure 4 is Figure 3 is a magnified view of B in FIG. 1.

[0038] Reference Signs List

[0039] 100 - battery pack; 1 - box body; 11 - bottom plate; 12 - side plate; 13 - upper cover; 14 - containing space; 15 - heat exchange plate; 2 - battery module; 21 - battery cell; 3 - glue filling structure; 31 - first glue filling part; 32 - third glue filling part; 4 - first gap; 5 - battery management module; 51 - electrical connection part; 6 - structural glue. DETAILED DESCRIPTION

[0040] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0041] In the present disclosure, the orientation words such as "upper", "lower", "left", "right", "first direction" and "second direction" and the like used without the opposite description indicate the orientation or positional relationship defined based on the drawing plane direction shown in the drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation configuration and operation, and therefore cannot be understood as a limitation on the present disclosure, and the terms "inner" and "outer" refer to the inner and outer of the corresponding structure profile. For example, the "first direction" can be the length direction of the battery pack, and the "second direction" can be the width direction of the battery pack, and the present disclosure does not limit this.

[0042] In addition, it should be noted that the terms such as "first", "second" and the like are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, in the description with reference to the drawings, the same reference signs in different drawings represent the same element.

[0043] In the description of the present disclosure, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected", "installed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0044] As mentioned above, how to improve the stiffness and modal of the battery pack has become the research direction.

[0045] In view of this, as Figures 1 to 4As shown, according to the first aspect of the present disclosure, a battery pack 100 is provided, which comprises a box 1, a battery module 2 and a glue filling structure 3, the battery module 2 is located in the box 1 and connected to the bottom plate 11 of the box, that is, the bottom of the battery module 2 is connected to the bottom plate 11, the box 1 can comprise the bottom plate 11 and the side plate 12, the side plate 12 is arranged around the bottom plate 11 and cooperates with the bottom plate 11 to define a containing space 14, that is, the battery module 2 can be located in the containing space 14, the battery module 2 comprises at least one battery cell 21, the battery module 2 has a first gap 4 between at least one end in the first direction and the side plate 12 of the box 1, the glue filling structure 3 comprises a first glue filling part 31, the first glue filling part 31 is arranged in the first gap 4 and used for connecting the side plate 12 and the battery module 2. Wherein, in the first direction, the width of the first glue filling part 31 is D1, the width of the battery cell 21 is D2, and D1 is less than D2.

[0046] When the above-mentioned battery pack 100 is applied to an electric device, the battery module 2 arranged in the battery pack 100 can supply power to the electric device, thereby driving the device main body in the electric device to operate. For example, the battery pack 100 can be a battery pack of a vehicle, and the battery pack can be electrically connected with a driving motor of the vehicle and / or a low-voltage system of the vehicle, thereby realizing power supply of the low-voltage system of the vehicle, meeting the daily demand of the vehicle, and also realizing power supply of the driving motor, meeting the driving demand of the vehicle.

[0047] Through the above technical solution, since the bottom of the battery module 2 is connected to the bottom plate 11, and the first glue filling part 31 is arranged in the first gap 4 between the side plate 12 of the box 1 and the battery module 2, in the battery pack 100 provided by the present disclosure, the battery module 2 is connected with the bottom plate 11 of the box 1 of the battery pack 100, and the battery module 2 can also be connected with the side plate 12 of the box 1 through the first glue filling part 31. In this way, on the one hand, the cured glue can provide support for the battery module 2, so that the fixing effect of the battery module 2 in the box 1 is good, and the battery module 2 is not easy to shake during use; on the other hand, compared with the embodiment in the related art in which the battery module 2 and the side plate 12 are connected through the foam, the battery pack 100 provided by the present disclosure connects the battery module 2 and the side plate 12 of the box 1 through the first glue filling part 31, and the battery module 2, the first glue filling part 31 and the side plate 12 of the box 1 cooperate with each other to form a force transmission path, thereby being capable of jointly transmitting the force acting on the battery pack 100, improving the rigidity, strength and modal of the whole battery pack 100, and being beneficial to improving the safety and durability of the battery pack 100.

[0048] In addition, because the glue solution has fluidity, by filling the glue solution in the first gap 4, the glue solution can be uniformly filled in the first gap 4, by injecting a preset amount of glue solution into the first gap 4, the glue solution can be filled according to the preset filling height, which is beneficial to overcome the manufacturing and assembly errors of each component of the battery pack.

[0049] According to the physical properties of the glue solution, it can be known that the elastic modulus of the glue solution is generally lower than that of the metal material (such as the shell of the battery monomer 21 or the side plate 12 of the box 1), therefore, when the first glue filling part 31 filled between the battery module 2 and the side plate 12 of the box 1 transmits force, if the width of the first glue filling part 31 is too large, it may cause a sudden change in stiffness between the battery module 2 and the box 1, and the wider the sudden change in stiffness, the weaker the stiffness, strength and modal of the battery pack 100.

[0050] Therefore, in the present disclosure, in the first direction, by reasonably designing the width of the first glue filling part 31 and the width of the battery monomer 21, the width D1 of the first glue filling part 31 is less than the width D2 of the battery monomer 21, so that the width of the first glue filling part 31 is not too wide, effectively reducing the case that the width of the first glue filling part 31 is too wide, causing the sudden change in stiffness between the battery module 2 and the side plate 12 to be wide, affecting the stiffness, strength and modal of the entire battery pack 100.

[0051] The above modal refers to the inherent vibration characteristics of a structural system, which reflects the inherent vibration characteristics of a structural system (such as the energy storage device mentioned above), and the higher the modal of the structural system, the better the dynamic performance of the structure, and the smaller the noise and vibration generated during use.

[0052] The present disclosure does not limit the specific number and specific type of battery monomers 21 in the battery module 2, the above-mentioned battery module 2 can have one battery monomer 21, and the above-mentioned battery module 2 can also be formed by a plurality of battery monomers 21 connected in series and / or parallel to each other.

[0053] In addition, the above-mentioned battery module 2 can be composed of single-row battery monomers 21, and the above-mentioned battery module 2 can also be composed of multiple-row battery monomers 21, the structures of the battery monomers in different rows of the multiple-row battery monomers 21 can be the same, and the structures of the battery monomers in different rows of the multiple-row battery monomers 21 can also be different, which is not limited by the present disclosure.

[0054] The present disclosure does not limit the specific width of the first glue filling part 31 and the battery monomer 21, as long as the first glue filling part 31 can meet the use requirements of the battery pack 100. As an embodiment of the present disclosure, optionally, the width D1 of the first glue filling part 31, the width D2 of the battery monomer 21, satisfy: <0.7.

[0055] Since the width D1 of the first glue-filling part 31 and the width D2 of the battery monomer 21 satisfy: <0.7, the first glue-filling part 31 can have a proper width, and the width of the first glue-filling part 31 is further not too wide, so that the condition that the rigidity of the battery module 2 and the side plate 12 is suddenly changed and the rigidity and mode of the entire battery pack 100 are affected due to the too wide width of the first glue-filling part 31 is effectively reduced.

[0056] The height of the first glue-filling part 31 is not limited in the present disclosure, and the first glue-filling part 31 can completely fill the entire first gap 4 in the height direction of the battery pack, or the first glue-filling part 31 can fill part of the first gap 4. Alternatively, as shown in Figure 2 and Figure 4 The height of the first glue-filling part 31 is H1, and the height of the battery module 2 is H2, and H1 / H2 satisfies 0.25<H1 / H2<1.35.

[0057] The height H1 of the first glue-filling part 31 refers to the distance between one end of the first glue-filling part 31 on the bottom plate 11 of the box body 1 and the other end of the first glue-filling part 31 away from the bottom plate 11 of the box body 1, and the height H2 of the battery module 2 refers to the distance between one end of the battery module 2 on the bottom plate 11 of the box body 1 and the other end of the battery module 2 away from the bottom plate 11 of the box body 1.

[0058] Since H1 / H2>0.25, the first glue-filling part 31 has a certain height in the gap between the side plate 12 and the battery module 2, the contact area between the first glue-filling part 31 and the side plate 12 and the battery module 2 is large, and the first glue-filling part 31 with a certain height can make the transmission path between the battery module 2 and the side plate 12 larger, thereby improving the rigidity of the entire battery pack 100, and effectively avoiding the stress concentration at the bonding position between the first glue-filling part 31 and the side plate 12 and / or the battery module 2 due to the small transmission path between the battery module 2 and the side plate 12 of the box body 1, so that the first glue-filling part 31 is prone to delamination.

[0059] In addition, since H1 / H2<1.35, the height of the first glue-filling part 31 is not too high. In this way, the amount of glue of the first glue-filling part 31 can be reduced under the premise of improving the rigidity of the battery pack 100, and the first glue-filling part 31 with less glue is conducive to reducing the weight of the entire battery pack 100, and the battery pack 100 with smaller weight is conducive to improving the energy density of the entire battery pack 100 and reducing the cost increase due to the use of too much glue.

[0060] Alternatively, as shown in Figure 2 and Figure 4As shown, the H1 and H2 satisfy: 0.25 < H1 / H2 < 1. Since H1 / H2 < 1, in other words, the height of the first glue-filling part 31 is lower than the height of the battery module 2, by reasonably designing the height of the first glue-filling part 31, it is beneficial to avoid the first glue-filling part 31 from penetrating into the interior and / or connecting part of other components (such as the battery management module 5 mentioned below) in the battery pack 100, on the premise of meeting the requirements of improving the stiffness and strength of the battery pack 100.

[0061] At the same time, by reasonably designing the height of the first glue-filling part 31, it is also possible to reserve a gas accumulation space in the interior of the battery pack 100 in the case of using foaming glue for the first glue-filling part 31, effectively avoiding the case that the first glue-filling part 31 uses foaming glue, the height of the first glue-filling part 31 is relatively high, and the gas accumulates between the upper cover 13 and the battery module 2 of the battery pack 100 during the foaming process, resulting in the phenomenon of gas accumulation in the sealant in this part of the area, thereby causing the actual bonding area between the battery module 2 and the upper cover 13 to be lower than the preset value, causing the bonding effect between the battery module 2 and the top cover to decrease, and affecting the stiffness of the entire battery pack.

[0062] In order to further improve the stiffness and modal improvement effect of the first glue-filling part 31 on the battery pack 100, optionally, as shown in Figure 2 and Figure 4 As shown, the height of the first glue-filling part 31 is H1, and the height of the battery module 2 is H2, when D2 < 300 mm, H1, H2, D1 and D2 satisfy: 0.65 < H1 / H2 < 0.9, and D1 / D2 < 0.25; when D2 ≥ 300 mm, H1, H2, D1 and D2 satisfy: 0.65 < H1 / H2 < 0.9, and D1 / D2 < 0.25. < 0.25; when D2 ≥ 300 mm, H1, H2, D1 and D2 satisfy: 0.65 < H1 / H2 < 0.9, and D1 / D2 < 0.25. < 0.25; where E is the DMA modulus of the first glue-filling part 31, and the DMA modulus refers to the elastic modulus or tensile modulus of the material obtained by DMA test, and M is the mass of the battery module 2.

[0063] Here, it should be noted that the above E can refer to the DMA modulus at a preset temperature and a preset frequency, for example, the DMA modulus of the first glue-filling part 31 at 25°C and 1Hz frequency.

[0064] The above-mentioned DMA (Dynamic Mechanical Analysis) modulus refers to the dynamic modulus measured in dynamic mechanical analysis. DMA testing is a technique for measuring the solid-state rheological properties of viscoelastic materials as a function of frequency and temperature, mainly used for dynamic mechanical testing, which can determine the relationship between temperature, frequency, time, stress, strain and dynamic modulus, loss parameters, determine the glass transition temperature, secondary relaxation transition, etc. In the battery pack 100 provided in the present disclosure, since H1, H2, D1 and D2 satisfy: when D2<300mm, 0.65 <25; when D2≥300mm, 0.65 <25, by reasonably designing the width and / or height of the first glue filling part 31, the amount of glue of the first glue filling part 31 can be reduced under the premise of maximizing the improvement of the stiffness and modal of the battery pack 100, thereby reducing the weight of the entire battery pack 100, so that the battery pack 100 can have a larger energy density.

[0065] In addition, when the first glue filling part 31 adopts foaming glue, a gas accumulation space can be reserved for the foaming glue. In this way, in the embodiment in which the first glue filling part 31 adopts foaming glue, the gas accumulated between the upper cover 13 and the battery module 2 of the battery pack 100 during the foaming process of the foaming glue can be reduced, so that the actual bonding area between the battery module 2 and the upper cover 13 is lower than the preset value, which causes the bonding effect between the battery module 2 and the upper cover to decrease, thereby affecting the stiffness and stiffness of the entire battery pack.

[0066] Considering that if the width D2 of the battery cell 21 is too large, for example, when D2 is greater than or equal to 300mm, only a part of the battery cell 21 in the first direction can play a role in transmitting force, based on this, in order to improve the accuracy of the above-mentioned relationship between H1, H2, D1 and D2 in determining the improvement effect of H1, H2, D1 and D2 on the stiffness and modal of the battery pack 100, according to different values of D2, the ratio relationship of H1, H2, D1 and D2 is distinguished, that is, when D2<300mm, H1, H2, D1 and D2 satisfy: 0.65 <25; when D2≥300mm, H1, H2, D1 and D2 satisfy: 0.65 <25.

[0067] For example, in the actual scheme of the battery pack 100, the first glue-filling part 31 can be arranged in the gap between the short side of the battery monomer 21 and the box body 1, or the first glue-filling part 31 can be arranged in the gap between the long side of the battery monomer 21 and the box body 1. If the first glue-filling part 31 is arranged in the gap between the short side of the battery monomer 21 and the box body 1, at this time, in the first direction, D2 is large (for example, D2≥300 mm), and only a part of the battery monomer 21 in the first direction can transmit the force. When the first glue-filling part 31 is arranged between the long side of the battery monomer 21 and the box body 1, at this time, in the first direction, D2 is small (for example, <300 mm), at this time, the battery monomer 21 can transmit the force as a whole in the first direction.

[0068] Optionally, the above E satisfies: E≥30Mpa. Since the DMA modulus of the first glue-filling part 31 is ≥30Mpa, the first glue-filling part 31 with a higher DMA modulus can make the energy storage unit have a higher modal and better stress condition, thereby improving the rigidity and modal improvement effect of the first glue-filling part 31 on the battery pack 100.

[0069] The present disclosure gives the value range of the key parameters such as H1, D1 and E of the glue-filling part (the first glue-filling part 31), which can be used for quickly checking the rationality of the design of the first glue-filling part 31 in the early design stage, and avoiding the structural failure of the key parts inside the whole pack caused by unreasonable design in the later stage.

[0070] In the present disclosure, the applicant also tests the numerical relationship between the above H1, H2, D1 and D2, and the test results can be referred to Table 1 in the following.

[0071] In the test, the applicant uses the battery monomer of the blade cell for real test, but through the CAE simulation test of the applicant, the above test is also applicable to the battery monomer of the square cell type, and the experimental data obtained are consistent, that is, the numerical relationship of H1, H2, D1 and D2 of the first glue-filling part 31 and the battery module 2 provided in the present disclosure can be applied to both the battery monomer of the blade cell type and the battery monomer of the square cell type.

[0072] In this test, the envelope size in the test pack box is 2000*1500*100mm, but through the CAE simulation test of the applicant, the battery pack of different sizes can also satisfy the numerical relationship of the above H1, H2, D1 and D2. In other words, the numerical relationship of the above H1, H2, D1 and D2 can be analogized to any PHEV and EV project CTB glue-filling scheme battery pack.

[0073] The test method described above is that, after the test pack (i.e. the battery pack sample for testing) is assembled, vibration and impact tests are carried out under the GB 38031-2020 "Safety requirements for power storage batteries for electric vehicles" label, and after the test, the integrity of the shell of the battery cell is observed, i.e. whether the box of the test pack (i.e. the battery pack) is cracked and leaks, and whether the CAE simulated weld of the box of the battery pack exceeds the threshold. Among them, the vibration test considers the high temperature working environment of the battery pack during vehicle use, and the PSD spectrum of the vibration test is 2 times the intensity of the national standard. In addition, if the above battery pack is a CTB battery pack, and the CTB scheme contains a whole vehicle seat beam, the seat and dummy load are also carried during testing, and the test results are shown in Table 1.

[0074] Table 1

[0075]

[0076] The test results described above are obtained according to actual testing and / or through CAE simulation testing, and the module mass M refers to the total mass of all battery cells 21 in the battery module 2.

[0077] The elastic modulus E of the first glue filling part 31 is the DMA modulus of the first glue filling part 31 at 25°C and 1Hz frequency.

[0078] In Table 1 above, the evaluation value is or .

[0079] Comparing Comparative Example 2 and Example 1 in Table 1 above, under the condition that the same material is used in the first glue filling part 31 and the mass M of the battery module 2 is the same, it can be found that, under the condition that D2<300mm, if H1, H2, D1 and D2 do not satisfy: 0.65 <25, for example, in Comparative Example 2, the evaluation value ( )≈0.61, the box 1 of the battery pack 100 will crack and leak or the weld will exceed the threshold, and the stiffness, strength and modal of the battery pack 100 cannot meet the design requirements.

[0080] And when H1, H2, D1 and D2 satisfy the above numerical relationship, for example, in Example 1, under the condition that D2<300mm, the evaluation value ( )≈1.01, the box 1 will not crack and leak or the weld will not exceed the threshold, and the stiffness, strength and modal of the battery pack 100 can meet the design requirements.

[0081] Comparing Comparative Example 4 and Example 2 in Table 1 above, under the condition that the same material is used in the first glue filling part 31 and the mass M of the battery module 2 is the same, it can be found that, under the condition that D2≥300mm, if H1, H2, D1 and D2 do not satisfy: 0.65 <25, for example, in Comparative Example 4, the evaluation value ( If the value is approximately 0.46, the casing 1 of the battery pack 100 will crack and leak or the weld will exceed the threshold. The stiffness, strength and modal characteristics of the battery pack 100 will not meet the design requirements.

[0082] When H1, H2, D1, and D2 satisfy the above numerical relationships, for example, in Example 2, when D2 ≥ 300 mm, With a strength of ≈0.58, the casing 1 will not crack or leak, and the weld seam will not exceed the threshold. The rigidity, strength, and modal characteristics of the battery pack 100 can meet the design requirements.

[0083] In summary, by rationally designing the height H1 and width D1 of the first glue-dispensing section 31, the first glue-dispensing section 31 satisfies the following conditions: when D2 < 300mm, 0.65 < <25; or, when D2≥300mm, 0.65< A value of <25 allows for a larger force transmission path between the battery module 2 and the side plate 12, thereby improving the stiffness, strength, and modal characteristics of the entire battery pack 100 and meeting the design requirements of the battery pack 100.

[0084] Furthermore, by rationally designing the height H1 and width D1 of the first potting section 31, the aforementioned evaluation value is made less than 25. Under the premise that the rigidity, strength and modality of the battery pack 100 meet the design requirements, the amount of adhesive used in the first potting section 31 can be reduced, thereby reducing the overall weight of the battery pack 100. A lighter battery pack 100 helps to reduce the cost increase caused by using too much adhesive and can also improve the energy density of the entire battery pack 100.

[0085] It should be noted that this disclosure does not limit the specific values ​​of the width D1 of the first potting part 31 in the first direction and the height H1 of the first potting part 31. As long as the width D1 of the first potting part 31 in the first direction, the width D2 of the battery cell 21, the height H1 of the first potting part 31 and the height H2 of the battery cell 21 satisfy the above relationship, the rigidity, strength and mode of the battery pack can meet the design requirements of the battery pack 100.

[0086] Optionally, the height H1 of the first glue-filling part 31 and the height H2 of the battery monomer 21 can satisfy 0.25 < H1 / H2 < 1.35. In this range, the first glue-filling part 31 can have a larger force transmission path between the battery module 2 and the side plate 12, thereby improving the rigidity of the entire battery pack 100, effectively avoiding stress concentration at the bonding position between the first glue-filling part 31, the side plate 12 and / or the battery module 2, and thus preventing the first glue-filling part 31 from being easily separated.

[0087] In addition, in this range, the height of the first glue-filling part 31 is not too high. In this way, the amount of glue used in the first glue-filling part 31 can be reduced while improving the rigidity of the battery pack 100. The first glue-filling part 31 with less glue is beneficial to reduce the weight of the entire battery pack 100, and the battery pack 100 with less weight is beneficial to improve the energy density of the entire battery pack 100 and reduce the increase in cost caused by using too much glue.

[0088] Optionally, the width D2 of the first glue-filling part 31 and the battery monomer 21 can also satisfy: <0.7. In this way, the width of the first glue-filling part 31 is not too wide, effectively reducing the occurrence of the situation that the width of the first glue-filling part 31 is too wide, resulting in a wide rigidity sudden change area between the battery module 2 and the side plate 12, and affecting the rigidity and modal of the entire battery pack 100.

[0089] In the present disclosure, the battery module 2 can be arranged at any position in the box 1. For example, the battery module 2 can be arranged in the middle of the box 1, and the two ends of the battery module 2 along the first direction have first gaps 4 between the side plates 12 of the box 1. The battery module 2 can also be arranged on one side of the box 1. As an embodiment of the present disclosure, as shown in Figure 1 and Figure 3 The box 1 includes two side plates 12 arranged at intervals in the first direction, and the battery module 2 has first gaps 4 between the corresponding side plates 12 at both ends in the first direction. Each first gap 4 is provided with a first glue-filling part 31. In other words, the battery module 2 is arranged in the middle of the box 1, and the two ends of the battery module 2 along the first direction are connected to the side plates 12 of the box 1 through the first glue-filling parts 31, which is beneficial to improve the rigidity, strength and modal of the battery pack 100.

[0090] Optionally, the battery module 2 has a second gap between at least one end in the second direction and the side plate 12 of the box body 1 in the second direction, and the glue-filling structure 3 further comprises a second glue-filling part arranged in the second gap. In other words, in the second direction, the battery module 2 can also be connected to the side plate 12 of the box body 1 in the second direction through the second glue-filling part, and the connection position between the battery module 2 and the box body 1 is more, and the stiffness, strength and modal of the battery pack 100 are higher.

[0091] For the embodiment in which the battery module 2 and the side plate 12 have the first gap 4 and the second gap, optionally, the two first gaps 4 and the two second gaps are connected to form a ring gap, and the two first glue-filling parts 31 and the two second glue-filling parts are connected to form a ring glue-filling part. In other words, the battery module 2 is arranged in the middle of the box body 1, and the four sides of the battery module 2 can be connected to the side plate 12 of the box body 1 through the first glue-filling part 31 and the second glue-filling part respectively, and the stiffness, strength and modal of the battery pack 100 are higher.

[0092] In order to facilitate the control of the battery module 2 in the battery pack 100, optionally, as shown in Figure 3 and Figure 4 , the battery pack 100 can further comprise a battery management module 5 arranged at one end of the battery module 2 in the first direction and located in the first gap, and the battery management module 5 is provided with an electrical connection part 51 for connecting with the battery module 2, and the height of the first glue-filling part 31 is lower than the height of the electrical connection part 51. The battery management module 5 can be connected with the battery module 2, so as to realize the monitoring, control and other functions of the battery module 2, and the safety of the battery pack 100 is higher.

[0093] In addition, since the height of the first glue-filling part 31 is lower than the height of the electrical connection part 51 arranged on the battery management module 5, when the glue solution of the first glue-filling part 31 is filled in the battery pack 100, the glue solution of the first glue-filling part 31 will not penetrate into the electrical connection part 51 on the battery management module 5. In this way, on the one hand, it can avoid the situation that the glue solution damages the electrical connection part 51; on the other hand, it can also avoid the situation that the glue solution penetrates into the electrical connection part 51, causing the short circuit of the battery management module 5 and / or the battery module 2.

[0094] It should be noted that the specific type and specific structure of the above-mentioned battery management module 5 are not limited in the present disclosure, and as an embodiment of the present disclosure, the above-mentioned battery management module 5 can comprise a CMU (Cell Monitor Unit) module, i.e. a single cell monitoring module, which can monitor the current, voltage and temperature and other parameters of the battery module 2, which is beneficial to improve the performance and life of the battery module 2.

[0095] As other embodiments of the present disclosure, the battery management module 5 described above can further comprise a BMU (Battery Monitor Unit) module, i.e., a battery monitoring unit, which can monitor and manage the state of the battery module 2, thereby ensuring that the battery module 2 operates safely and efficiently.

[0096] To avoid the glue flowing into the electrical connection part 51 when the glue in the first glue filling part 31 is poured into the box 1, optionally, as shown in the figure, the electrical connection part 51 comprises an electrical connection port at the upper end of the battery management module 5, and the battery pack 100 further comprises a shielding piece covering the upper end of the battery management module 5, which is used to shield the electrical connection port. In this way, when the glue in the first glue filling part 31 is poured, the glue is less likely to flow into the electrical connection port under the shielding effect of the shielding piece, thereby further avoiding the situation that the glue damages the electrical connection part 51.

[0097] The present disclosure does not limit the specific type of the first glue filling part 31, as long as the first glue filling part 31 is suitable for filling the gap between the side plate 12 and the battery module 2. As an embodiment of the present disclosure, the first glue filling part 31 described above adopts foaming glue, which has a first density ρ1, which is the density of the foaming glue after foaming, wherein the first density ρ1 satisfies: ρ1≤0.4g / cm 3 The density of the foaming glue after foaming is also low. Therefore, under the same volume, the mass of the foaming glue with low density is low, thereby reducing the overall mass of the first glue filling part 31, thereby facilitating the reduction of the overall mass of the battery pack 100 using the first glue filling part 31, and further facilitating the improvement of the energy density of the battery pack 100.

[0098] Optionally, the foaming glue described above further has a second density ρ2, which is the density of the foaming glue before foaming, wherein the second density ρ2 satisfies: ρ2≤1.35g / cm 3 The density of the foaming glue before foaming is low. The foaming glue with low density is convenient to store, and at the same time, the foaming glue with low density has good flexibility and elasticity, which is convenient to fill between the battery module 2 and the side plate 12.

[0099] Here, it should be noted that the present disclosure does not limit the specific way of how to achieve the first density ρ1 described above. For example, the density of the foaming glue after foaming (i.e., the first density ρ1 described above) can be controlled by controlling the temperature of the foaming glue during the pouring process, and the density of the foaming glue after foaming can also be controlled by using different types of foaming glue.

[0100] As other embodiments of the present disclosure, the first glue filling part 31 described above can also adopt non-conductive glue (such as NCP, Non-Conductive Paste), etc., which is not limited by the present disclosure.

[0101] To facilitate the glue of the first glue-filling part 31 to be poured into the battery pack 100, the glue of the first glue-filling part 31 has a rotational viscosity η, which satisfies: η < 2000 CPS. The glue with low rotational viscosity has high flowability, which facilitates the flow of the glue in the battery pack 100. In this way, on the one hand, the glue of the first glue-filling part 31 can be uniformly distributed in the battery pack 100, and on the other hand, the first glue-filling part 31 can be filled in the narrow gap in the battery pack 100.

[0102] For the embodiment in which the first glue-filling part 31 is made of foaming glue, in order to improve the reliability of the first glue-filling part 31 during use, the foaming glue has a glass transition temperature N, and the glass transition temperature N ≥ 60℃. In this way, even if the battery pack 100 generates heat during use, the temperature of the first glue-filling part 31 is not easy to reach its glass transition temperature, effectively avoiding the situation that the first glue-filling part 31 is heated to glass transition, resulting in a decrease in the strength of the first glue-filling part 31.

[0103] In order to improve the insulation of the battery pack 100, the insulation performance of the first glue-filling part 31 satisfies: the volume resistivity ≥ 10 13 Ω / cm 3 , the breakdown voltage ≥ 4KV / mm, and the leakage current < 0.5 mah. In other words, the first glue-filling part 31 is made of insulating material, and the first glue-filling part 31 itself will not conduct electricity, effectively avoiding the situation that the first glue-filling part 31 conducts electricity, resulting in short circuit of components in the battery pack 100, affecting the normal use of the battery pack 100.

[0104] Optionally, as shown in Figure 2 , the box body 1 can further include an upper cover 13, which is arranged at the upper end of the side plate 12. The glue-filling structure 3 further includes a third glue-filling part 32, and the upper end of the battery module 2 is bonded to the upper cover 13 through the third glue-filling part 32. The upper cover 13, the side plate 12 and the bottom plate 11 of the box body 1 cooperate with each other to collectively enclose the battery module 2, thereby protecting the battery module 2, and prolonging the service life of the battery module 2.

[0105] In addition, the upper cover 13, the battery module 2 and the bottom plate 11 of the box body 1 can form a sandwich structure, which is also conducive to improving the stiffness and modal of the battery pack 100.

[0106] In the battery pack 100 provided by the present disclosure, the bottom plate 11 can be connected to the battery module 2 in any manner as long as the connection between the bottom plate 11 and the battery module 2 is reliable, and the present disclosure does not limit this. As an embodiment of the present disclosure, the bottom surface of the battery module 2 is adhered to the bottom plate 11 by the structural adhesive 6. The connection between the battery module 2 and the bottom plate 11 connected by the structural adhesive 6 is relatively convenient, which is conducive to improving the assembly efficiency of the entire battery pack 100.

[0107] In order to exchange heat for the battery module 2, the bottom plate 11 can also include a heat exchange plate 15, and the bottom plate 11 of the battery module 2 is adhered to the heat exchange plate 15 by the structural adhesive 6, and the structural adhesive 6 is a heat-conducting adhesive. The heat exchange plate 15 can take away the heat generated by the battery module 2 during operation through the heat-conducting adhesive, so that the battery module 2 can operate within a reasonable temperature range, and the safety of the battery module 2 is higher and the service life is longer. Figures 1 to 4 The present disclosure does not limit the specific structure of the bottom plate 11. As shown in

[0108] The bottom plate 11 can be configured as a heat exchange plate 15, which can not only exchange heat for the battery module 2, but also support the battery module 2. Figures 1 to 4 As another embodiment of the present disclosure, the bottom plate 11 can also include a body and a heat exchange plate 15 arranged on the body. The body can support the battery module 2, and the heat exchange plate 15 is used to exchange heat for the battery module 2.

[0109] According to a second aspect of the present disclosure, a power-consuming device is provided, which includes a device body and the battery pack 100 as described above, and the battery pack 100 is installed on the device body and used to supply power to the device body.

[0110] The power-consuming device has all the beneficial effects of the above-mentioned energy storage device, which will not be repeated here.

[0111] Here, it should be noted that the present disclosure does not limit the specific type of power-consuming device. The above-mentioned power-consuming device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or an extended range automobile. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric aircraft toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, and the present disclosure does not limit this.

[0112]

[0113] ​As an embodiment of the present disclosure, the above power consuming device is a vehicle, a part of the vehicle body is configured as the upper cover 13 of the box 1, and the upper cover 13 is arranged at the upper end of the side plate 12.

[0114] In other words, the battery pack is integrated in the vehicle body, so that on the one hand, the integrated battery pack and the vehicle body can improve the torsional strength of the whole vehicle, so that the vehicle is more stable during driving, the handling is improved, and the safety is also enhanced; on the other hand, the integrated battery pack can also reduce the part of the box 1 of the battery pack, so that the cost increase caused by using the part of the shell can be reduced, and the thickness increase of the vehicle chassis caused by using the part of the shell can be reduced, which is beneficial to improve the compactness of the vehicle.

[0115] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0116] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0117] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as the disclosed content of the present disclosure.

Claims

1. A battery pack, characterized by, The battery pack comprises a box body, a battery module and a glue filling structure; The battery module is located in the box body and connected to the bottom plate of the box body, and the battery module comprises at least one battery cell, and the battery module has a first gap between at least one end in the first direction and the side plate of the box body; The glue filling structure comprises a first glue filling part, and the first glue filling part is arranged in the first gap and used for connecting the side plate and the battery module; In the first direction, the width of the first glue filling part is D1, and the width of the battery cell is D2, and the D1 is less than the D2.

2. The battery pack of claim 1, wherein, The D1 and the D2 satisfy: <0.

7.

3. The battery pack of claim 1, wherein, The height of the first glue filling part is H1, and the height of the battery module is H2, and the H1 and the H2 satisfy: 0.25 4. The battery pack of claim 1, wherein, The height of the first glue filling part is H1, and the height of the battery module is H2; when D2 < 300 mm, the H1, the H2, the D1 and the D2 satisfy: 0.65 < H1 / H2 < 1.25 and 0.65 < D1 / D2 < 1.25 < 25; When D2≥ 300 mm, the H1, the H2, the D1 and the D2 satisfy: 0.65 < H1 / H2 < 1.25, 0.65 < D1 / D2 < 1.25, and H1 < 0.25*D2. < 25; Wherein, E is the DMA modulus of the first glue filling part, and M is the mass of the battery module.

5. The battery pack of claim 4, wherein, The E satisfies: E≥30Mpa.

6. The battery pack of any one of claims 1-5, wherein, The box body comprises two side plates arranged at intervals in the first direction; The battery module has the first gap between both ends in the first direction and the corresponding side plate, and the first glue filling part is arranged in each first gap; The battery module has a second gap between at least one end in the second direction and the side plate of the box body; The glue filling structure further comprises a second glue filling part, and the second glue filling part is arranged in the second gap, and the second direction intersects the first direction.

7. The battery pack of claim 6, wherein, Two first gaps and two second gaps are connected to form a ring gap, and two first glue filling parts and two second glue filling parts are connected to form a ring glue filling part.

8. The battery pack of any one of claims 1-5, wherein, The battery pack further comprises a battery management module, and the battery management module is arranged at one end of the battery module in the first direction and located in the first gap; The battery management module is provided with an electrical connection part connected with the battery module, and the height of the first glue filling part is lower than the height of the electrical connection part.

9. The battery pack of claim 8, wherein, The electrical connection part comprises an electrical connection port located at the upper end of the battery management module; The battery pack further comprises a shielding piece, and the shielding piece covers the upper end of the battery management module, and the shielding piece is used for shielding the electrical connection port.

10. The battery pack of any one of claims 1-5, wherein, The first glue filling part adopts foaming glue, and the foaming glue has a first density ρ1, and the first density ρ1 is the density of the foaming glue after foaming; Wherein, the first density ρ1 satisfies: ρ1≤0.4 g / cm3.

11. The battery pack of any one of claims 1-5, wherein, The box body further comprises an upper cover, and the upper cover is arranged at the upper end of the side plate; The glue filling structure further comprises a third glue filling part, and the upper end of the battery module is bonded to the upper cover through the third glue filling part.

12. An electrical device, characterized by The battery pack comprises a box body, a battery module and a glue filling structure; 13. The powered device of claim 12, wherein, The battery pack is installed on the equipment body and used for supplying power to the equipment body. The electrical equipment is a vehicle, and a part of the vehicle body is configured as the upper cover of the box body, and the upper cover is arranged at the upper end of the side plate.

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