Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack. The battery pack comprises a box body and a plurality of batteries, the box body comprises a bottom plate, side plates and an anti-collision plate, the anti-collision plate is arranged between a first side plate formed by the side plates arranged in the length direction of the box body and the batteries, and a first end plate and a second end plate are formed in the first direction perpendicular to the first side plate and parallel to the bottom plate; the first end plate, the second end plate and the first side plate define a space for containing a battery, the two ends of the anti-collision plate and at least one end of the first end plate and the second end plate are arranged at intervals to form a cavity, the length of the anti-collision plate in the length direction of the box body is B, the distance between the first end plate and the second end plate is A, and B is larger than or equal to 20% A and smaller than or equal to 80% A. The middle area of the battery pack is supported through the anti-collision plate, and after the battery pack is impacted by the outside, the anti-collision plate absorbs impact capacity and disperses impact energy to two sides, so that batteries in the middle area of the battery pack are protected from direct impact and damage.

Description

Technical Field

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

[0002] As technology advances, the energy density of battery packs continues to increase while their costs decrease, making them increasingly important in renewable energy storage and electric transportation. For example, in electric vehicles, as one of their core components, the battery pack's performance directly impacts the vehicle's range and overall performance, while its safety is directly related to the safety of the entire vehicle.

[0003] When an electric vehicle experiences a side impact, such as when the side of the vehicle strikes a pole or other column, it impacts the side of the battery pack. However, the cells are concentrated in the center of the battery pack, lacking a rigid crossbar to disperse the impact force. Furthermore, the charging and discharging process causes the cells in this center area to expand and deform, with the cells in the middle of the pack experiencing the greatest expansion. Therefore, when a pole impact occurs, the impact on the center of the battery pack can easily lead to deformation, damage, and leakage, posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem that the central area of ​​the battery pack is easily deformed, damaged, and leaks when a pole collision occurs on the side of the car.

[0005] The utility model provides a battery pack, comprising: a box body and a plurality of batteries, the box body comprising a bottom plate, side plates and an anti-collision plate, the side plates and the bottom plate jointly forming a storage space for placing the plurality of batteries, the side plates arranged along the length direction of the box body form a first side plate, an anti-collision plate is arranged between the first side plate and the plurality of batteries, a first end plate and a second end plate are formed in a first direction perpendicular to the first side plate and parallel to the bottom plate, a space for accommodating at least part of the plurality of batteries is enclosed between the first end plate, the second end plate and the first side plate, and a cavity is formed at both ends of the anti-collision plate and at least one end of the first end plate and the second end plate along the length direction of the box body, the length of the anti-collision plate in the length direction of the box body is B, and the distance between the first end plate and the second end plate is A, wherein 20%A≤B≤80%A.

[0006] Beneficial effect: The anti-collision plate is set between the first end plate and the second end plate, and the middle area of ​​the battery pack is supported by the anti-collision plate. After the battery pack is hit by an external impact, the anti-collision plate absorbs the impact and disperses the impact energy to both sides, thereby protecting the batteries in the middle area of ​​the battery pack from direct impact and damage, thereby effectively solving the problem that the center area of ​​the battery pack is easily deformed, damaged, and leaked when a column collision occurs on the side of the car.

[0007] In order to solve the problem of temperature imbalance in the battery pack, the length of the anti-collision plate is smaller than the spacing between the first end plate and the second end plate, that is, there is a gap between the two ends of the anti-collision plate and the first end plate and the second end plate. The heat transfer efficiency of the cavity is lower than the heat transfer efficiency of the anti-collision plate. The parts where anti-collision plates are set at both ends of the battery have better heat dissipation effect than the parts where anti-collision plates are not set at both ends of the battery, so that the overall temperature of the battery pack tends to be balanced, which can optimize the charging and discharging process of the battery pack and ensure that all batteries operate within the optimal temperature range, thereby improving the charging and discharging efficiency. It can also reduce the thermal stress difference between battery cells, which helps all batteries to age evenly, thereby extending the service life of the entire battery pack.

[0008] Setting the length B of the anti-collision plate within the range of 20%A-80%A, that is, setting the length of the anti-collision plate within a reasonable range, can not only control the amount of material used, thereby reducing manufacturing costs, but also provide sufficient structural support to ensure that the battery pack is not easily deformed during collision or vibration, effectively disperse the collision energy, and effectively protect the batteries in the middle area of ​​the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 A three-dimensional diagram of a battery pack according to an embodiment of the present invention;

[0011] Figure 2 for Figure 1 A top view of the battery pack, crash plate, and cross member is shown;

[0012] Figure 3 for Figure 2 a top view of the fender and cross member shown;

[0013] Figure 4 for Figure 3 Front view of the fender and cross member shown;

[0014] Figure 5 for Figure 1 The battery shown includes a partial top view;

[0015] Figure 6 for Figure 5 A partial enlarged schematic diagram;

[0016] Figure 7 for Figure 1 The schematic diagram of the structure of the battery and the anti-collision plate shown;

[0017] Figure 8 for Figure 7 a perspective view of the battery shown;

[0018] Figure 9 for Figure 8 A schematic structural diagram of a pole group of a battery shown;

[0019] Figure 10 for Figure 1 A perspective view of the strike plate shown;

[0020] Figure 11 for Figure 10 An exploded view of the strike plate is shown;

[0021] Figure 12 for Figure 10 A top view of the strike plate shown;

[0022] Figure 13 for Figure 12 A partial enlarged schematic diagram of B in the figure.

[0023] Description of reference numerals:

[0024] 1. Bottom plate;

[0025] 2. First side panel;

[0026] 3. Battery; 301. Housing; 302. Cover; 303. Post; 304. Pole;

[0027] 4. Anti-collision plate; 401. Fixed adhesive layer; 402. First composite plate; 403. Middle layer; 4031. Middle plate; 4032. Side plate; 4033. Hollow plate; 4034. Connecting rib; 404. Second composite plate;

[0028] 5. First end plate;

[0029] 6. Second end plate. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0031] In related technologies, on the one hand, the middle area of ​​the battery pack has no crossbeam support, so the impact energy cannot be absorbed, transferred, or dispersed when the middle area of ​​the battery pack is hit by an external impact, which can easily cause damage to the battery; on the other hand, the battery cells will also be deformed due to gas production during the charging and discharging process of the battery pack; the degree of deformation of the battery cells in the middle area is relatively more serious.

[0032] In order to solve the above problems, the following Figures 1 to 13 , describing the embodiments of the present utility model.

[0033] According to an embodiment of the present utility model, a battery pack is provided, comprising: a box body and a plurality of batteries 3, the box body comprising a bottom plate 1, side plates and an anti-collision plate 4, the side plates and the bottom plate 1 together forming a accommodating space for placing the plurality of batteries 3, the side plates arranged along the length direction of the box body form a first side plate 2, an anti-collision plate 4 is arranged between the first side plate and the plurality of batteries 3, a first end plate 5 and a second end plate 6 are formed in a first direction perpendicular to the first side plate 2 and parallel to the bottom plate 1, a space for accommodating at least part of the plurality of batteries 3 is enclosed between the first end plate, the second end plate and the first side plate 2, along the length direction of the box body, both ends of the anti-collision plate 4 and at least one end of the first end plate 5 and the second end plate 6 are spaced apart to form a cavity, the length of the anti-collision plate 4 in the length direction of the box body is B, and the distance between the first end plate 5 and the second end plate 6 is A, wherein 20%A≤B≤80%A.

[0034] In the battery pack of this embodiment, the anti-collision plate 4 is set between the first end plate 5 and the second end plate 6, and the middle area of ​​the battery pack is supported by the anti-collision plate 4. After the battery pack is hit by an external impact, the anti-collision plate 4 absorbs the impact and disperses the impact energy to both sides, thereby protecting the batteries 3 in the middle area of ​​the battery pack from direct impact and damage, thereby effectively solving the problem that the central area of ​​the battery pack is easily deformed, damaged, and leaked when a column collision occurs on the side of the car.

[0035] Since there is no crossbeam in the battery cells 3 in the middle area between the first end plate 5 and the second end plate 6 and they are densely arranged, the temperature of the battery cells 3 in the middle area is higher than that on both sides, resulting in temperature imbalance in the battery pack. The battery cells 3 with higher temperatures may experience a faster chemical reaction rate, resulting in accelerated capacity decay. Conversely, the battery cells 3 with lower temperatures may not be fully charged or discharged, thereby affecting the overall capacity. Temperature imbalance will accelerate the aging of the battery cells 3, especially in high-temperature areas, and the cycle life of the battery cells 3 may be significantly shortened.

[0036] In order to solve the problem of temperature imbalance in the battery pack, the length of the anti-collision plate 4 is smaller than the spacing between the first end plate 5 and the second end plate 6, that is, there is a gap between the two ends of the anti-collision plate 4 and the first end plate 5 and the second end plate 6, and the heat transfer efficiency of the cavity is lower than the heat transfer efficiency of the anti-collision plate 4. The parts where the anti-collision plates 4 are set at both ends of the battery 3 have better heat dissipation effect than the parts where the anti-collision plates 4 are not set at both ends of the battery 3, so that the overall temperature of the battery pack tends to be balanced, which can optimize the charging and discharging process of the battery pack and ensure that all batteries 3 operate within the optimal temperature range, thereby improving the charging and discharging efficiency. It can also reduce the thermal stress difference between battery cells, which helps all batteries 3 to age evenly, thereby extending the service life of the entire battery pack.

[0037] Furthermore, the length of the anti-collision plate 4 is Figure 3 The lateral dimension of the middle anti-collision plate 4 and the length of the anti-collision plate 4 should be neither too large nor too small. If the length of the anti-collision plate 4 is large, it means that the spacing between the anti-collision plate 4 and the first end plate 5 and the second end plate 6 is small. The longer anti-collision plate 4 will increase the material usage, increase the manufacturing cost, and occupy a larger space, which may affect the layout of the battery 3; if the length of the anti-collision plate 4 is small, it means that the spacing between the anti-collision plate 4 and the first end plate 5 and the second end plate 6 is large. The shorter anti-collision plate 4 has a smaller coverage area and cannot provide sufficient structural support, resulting in the battery pack being easily deformed during collision or vibration, and unable to effectively disperse the collision energy, resulting in excessive local stress and increasing the risk of damage to the battery 3.

[0038] Therefore, setting the length B of the anti-collision plate 4 within the range of 20%A-80%A, that is, setting the length of the anti-collision plate 4 within a reasonable range, can not only control the amount of material used, thereby reducing manufacturing costs, but also provide sufficient structural support to ensure that the battery pack is not easily deformed during collision or vibration, effectively disperse the collision energy, and effectively protect the battery 3 in the middle area of ​​the battery pack.

[0039] Specifically, 20%A≥254 mm, that is, the minimum length of the anti-collision plate 4 is 254 mm, so that the anti-collision plate 4 effectively disperses the impact energy and effectively protects the battery 3 in the middle area.

[0040] Furthermore, the length of the anti-collision plate 4 may preferably be 30%A, 45%A, 50%A, 55%A or 60%A.

[0041] In one embodiment, the first end plate 5 and the second end plate 6 may be partition beams disposed inside the box body, and in this case, the partition beams may be referred to as cross beams.

[0042] It is understandable that, in another embodiment, the first end plate 5 and the second end plate 6 may be side plates of the box body, and in this case, no partition beam is provided in the box body.

[0043] It should be noted that the first direction is the width direction of the box body, the first end plate 5 extends along the first direction, and the length direction of the anti-collision plate 4 is arranged along the length direction of the box body.

[0044] In one embodiment, Figure 4 and Figure 9 As shown, the height of the anti-collision plate 4 is h, the battery 3 includes a pole piece 304, the pole piece 304 includes a body and a tab, the tab is set at the edge of the body, and the height of the body is H, where h≥95%H. The height of the anti-collision plate 4 is also Figure 4 The vertical dimension of the middle anti-collision plate 4 and the height of the body are also Figure 9 The vertical dimension of the mid-body.

[0045] Furthermore, the height of the anti-collision plate 4 cannot be too low. A lower anti-collision plate 4 has weaker protection in the vertical direction and cannot effectively resist impact from above. Its ability to protect the battery 3 is limited, and it cannot effectively disperse energy from different directions, increasing the risk of damage to the battery 3.

[0046] Therefore, the height of the anti-collision plate 4 is set to be greater than 95% H, so as to ensure the protection capability and energy dispersion effect of the anti-collision plate 4 and effectively protect the battery 3.

[0047] Specifically, the height of the impact plate 4 may preferably be 98%H, 100%H, 105%H, or 110%.

[0048] In one embodiment, Figure 7 and Figure 8 As shown, the battery 3 further includes a housing 301, a cover plate 302, and a terminal 303. The cover plate 302 is provided to cover the top opening of the housing 301, and the terminal 303 is provided on the cover plate 302. The upper surface of the anti-collision plate 4 is higher than the upper surface of the cover plate 302 and lower than the upper surface of the terminal 303. The height of the anti-collision plate 4 cannot be too high. A taller anti-collision plate 4 increases the amount of material used, thereby increasing the weight of the battery pack, and also occupies more vertical space, affecting the heat dissipation path at the top of the battery 3.

[0049] Therefore, setting the upper surface of the anti-collision plate 4 to be higher than the upper surface of the cover plate 302 and lower than the upper surface of the pole 303 can not only effectively protect the battery 3, but also control the material usage, weight, and occupied space of the anti-collision plate 4, which is conducive to reducing costs and the layout of the battery 3.

[0050] It should be noted that the up and down directions indicated are Figure 7 The arrow in the middle indicates the direction of "up" and "down".

[0051] In one embodiment, Figure 6 and Figure 13As shown, the thickness of the anti-collision plate 4 is T, and the distance between the first side plate 2 and the battery 3 is L, wherein 70% L≤T≤90% L. The thickness of the anti-collision plate 4 is also Figure 13 The vertical dimension of the middle anti-collision plate, the spacing between the first side plate 2 and the battery 3 is also Figure 6 The vertical dimension between the first side plate and the battery.

[0052] Furthermore, the thickness of the anti-collision plate 4 should be neither too thick nor too thin. If the thickness of the anti-collision plate 4 is thicker, the weight of the anti-collision plate 4 is heavier, the amount of material used is increased, the cost is higher, the weight of the battery pack is increased, and more space is occupied, thereby affecting the layout of the battery 3 and the overall energy density of the battery pack; if the thickness of the anti-collision plate 4 is thinner, the thinner anti-collision plate 4 has weaker ability to absorb and disperse impact energy, and may not be able to effectively disperse the collision energy, resulting in excessive local stress, increasing the risk of damage to the battery 3, and may be more prone to wear or damage during long-term use, affecting its service life.

[0053] Therefore, the thickness T of the anti-collision plate 4 is set to 70%L-90%L, that is, the thickness of the anti-collision plate 4 is set within a reasonable range, which not only controls the material usage and cost, but also ensures the ability of the anti-collision plate 4 to absorb and disperse intermediate energy, thereby ensuring the protection capability and structural stability of the anti-collision plate 4 and extending the service life of the battery 3.

[0054] Specifically, T may preferably be 75%L, 80%L, 83%L, or 85%L.

[0055] In one embodiment, L is 15-50 mm. The spacing L between the first side plate 2 and the battery 3 should be neither too large nor too small. If the spacing L between the first side plate 2 and the battery 3 is large, it means that the gap between the first side plate 2 and the battery 3 is large, which can reduce the number of installed batteries, thereby affecting the energy density of the entire battery pack. In order to ensure structural strength, filling material is required in the gap, and filling material may increase the overall weight. If the spacing L between the first side plate 2 and the battery 3 is small, it is not conducive to the installation of the anti-collision plate 4. In the event of a collision or other external force, the smaller gap may cause the battery to be directly impacted, increasing the risk of damage.

[0056] Therefore, when L is within the range of 15-50 mm, not only can the gap between the first side plate 2 and the battery 3 be controlled, thereby facilitating the installation of the anti-collision plate 4, but also the impact on the energy density of the entire battery pack can be reduced.

[0057] In one embodiment, Figures 10 to 12As shown, the anti-collision plate 4 includes a fixed adhesive layer 401, a first composite plate 402, an intermediate layer 403, and a second composite plate 404, which are sequentially arranged along the thickness direction of the anti-collision plate 4. The first composite plate 402 is fixed to the corresponding battery 3 via the fixed adhesive layer 401. The intermediate layer 403 includes an intermediate plate 4031 and side plates 4032 arranged at both ends of the intermediate plate 4031. The hardness of the intermediate plate 4031 is less than that of the side plates 4032. The side plates 4032 at both ends of the intermediate layer 403 are hard and the intermediate plate 4031 is soft, so that the force applied to the intermediate plate 4031 can be evenly distributed to both sides, effectively dispersing the force. The first composite plate 402 is bonded to the battery 3 via the fixed adhesive layer 401, thereby enhancing the structural strength and stability of the battery pack while preventing collisions.

[0058] Furthermore, the fixed adhesive layer 401 is made of structural adhesive, which has the advantages of high strength, chemical corrosion resistance, high temperature resistance, and easy processing, and can provide higher bonding force, thereby enhancing the connection strength.

[0059] Specifically, the middle plate 4031 is made of a foam material, which has advantages such as light weight, excellent mechanical properties, and good sound absorption performance. The pore size of the foam material can be 10 microns, and the foam material can be polypropylene foam plastic.

[0060] Furthermore, the first composite plate 402, the second composite plate 404 and the side plate 4032 are made of composite materials. In this case, the side plate 4032 is a composite profile. The composite material can be a resin-based composite material, a metal-based composite material or a ceramic-based composite material, for example: the composite material uses epoxy resin, phenolic resin, polyester resin, polyamide, polycarbonate, aluminum-based carbon fiber composite material, titanium-based ceramic particle composite material, silicon carbide-based carbon fiber composite material or alumina-based ceramic fiber composite material, etc.

[0061] It should be noted that the material selection for the composite profile is not limited to this. It only needs to be harder than the hardness of the intermediate panel 4031. To achieve both a certain degree of rigidity and energy absorption, a foam material with a higher hardness can also be selected. The first composite panel 402 and the second composite panel 404 can be manufactured using a pultrusion process or a pre-impregnated composite molding process, with the choice of process depending on specific application requirements, production scale, and cost control factors.

[0062] In one embodiment, the side panel 4032 can be a solid panel. The solid panel has high overall strength and rigidity, is not easily deformed when subjected to force, is easy to process, and reduces manufacturing difficulty. The side panel 4032 can also be a hollow panel, that is, the side panel 4032 includes a hollow panel body 4033 and connecting ribs 4034 arranged in the hollow cavity of the hollow panel body 4033. The hollow panel is light in weight, saves costs, and helps to reduce noise transmission.

[0063] Furthermore, the connecting ribs 4034 include a plurality of oblique ribs forming a certain angle with the inner wall of the hollow cavity and straight ribs connecting the oblique ribs, and the straight ribs extend along the height direction of the side plate 4032 .

[0064] It is understandable that the specific structure of the side plate 4032 is not limited thereto.

[0065] In one embodiment, Figure 12 As shown, in the longitudinal direction of the anti-collision plate 4, the ratio X of the length B1 of the middle plate 4031 to the length B2 of the side plate 4032 is 15%-50%. Figure 12 The horizontal dimension of the middle plate 4031 and the length of the side plate 4032 are Figure 12 The horizontal dimension of the middle side plate 4032.

[0066] Furthermore, the ratio of the length B1 of the middle plate 4031 to the length B2 of the side plate 4032 should be neither too large nor too small. If the ratio of the length B1 of the middle plate 4031 to the length B2 of the side plate 4032 is large, it means that the length of the middle plate 4031 is long and the side plate 4032 is short. Since the hardness of the middle plate 4031 is lower than that of the side plate 4032, the structural strength of the anti-collision plate 4 is low, and it is easy to deform when hit, increasing the risk of damage to the battery 3; if the ratio of the length B1 of the middle plate 4031 to the length B2 of the side plate 4032 is small, it means that the length of the middle plate 4031 is short and the side plate 4032 is long, and the ability to absorb and disperse impact energy is poor, resulting in loud noise and vibration.

[0067] Therefore, the ratio of the length B1 of the middle plate 4031 to the length B2 of the side plate 4032 is set to 15%-50%, that is, the ratio of the length B1 of the middle plate 4031 to the length B2 of the side plate 4032 is set within a reasonable range, which not only ensures the structural strength of the anti-collision plate 4, but also controls noise and vibration, thereby improving the comfort of the car.

[0068] Specifically, X may preferably be 25%, 30%, 35% or 40%.

[0069] In one embodiment, Figure 13 As shown, the thickness T1 of the first composite plate 402 is greater than the thickness T2 of the second composite plate 404. Since the first composite plate 402 is closer to the battery 3, the thickness of the first composite plate 402 is relatively thick, which can prevent debris generated during the collision from puncturing the battery 3, thereby reducing safety risks.

[0070] In one embodiment, Figure 13As shown, the ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 is 60%-99%. The ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 should be neither too large nor too small. If the ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 is large, it means that the thickness of the intermediate layer 403 is relatively thick, which increases the amount of material used, occupies more space, and may affect the layout of the battery 3. If the ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 is small, it means that the thickness of the intermediate layer 403 is relatively thin. The thinner anti-collision plate 4 has a weaker ability to absorb and disperse impact energy, and may not be able to effectively disperse the collision energy, resulting in excessive local stress, increasing the risk of damage to the battery 3, and may also be more susceptible to wear or damage during long-term use, shortening its service life.

[0071] Therefore, the ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 is set to 60%-99%, that is, the ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 is set within a reasonable range, which not only controls the material usage and cost, but also ensures the ability of the anti-collision plate 4 to absorb and disperse intermediate energy, thereby ensuring the protection capability and structural stability of the anti-collision plate 4 and extending the service life of the battery 3.

[0072] Specifically, the ratio of the thickness T3 of the intermediate layer 403 to the thickness T of the anti-collision plate 4 may preferably be 70%, 75%, 80%, 85%, 90% or 95%.

[0073] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A box body and a plurality of batteries (3), the box body comprising a bottom plate (1), a side plate and an anti-collision plate (4), the side plate and the bottom plate (1) together forming a storage space for placing the plurality of batteries (3), the side plate arranged along the length direction of the box body forming a first side plate (2), the anti-collision plate (4) being arranged between the first side plate and the plurality of batteries (3), a first end plate (5) and a second end plate (6) being formed in a first direction perpendicular to the first side plate (2) and parallel to the bottom plate (1), a space for accommodating at least part of the plurality of batteries (3) being enclosed between the first end plate, the second end plate and the first side plate (2), along the length direction of the box body, two ends of the anti-collision plate (4) and at least one end of the first end plate (5) and the second end plate (6) are spaced to form a cavity, the length of the anti-collision plate (4) in the length direction of the box body is B, the distance between the first end plate (5) and the second end plate (6) is A, wherein 20%A≤B≤80%A.

2. The battery pack according to claim 1, wherein: 20%A≥254mm.

3. The battery pack according to claim 1 or 2, characterized in that: The anti-collision plate (4) has a height of h, the battery (3) includes a pole piece (304), the pole piece (304) includes a body and a pole ear, the pole ear is arranged at the edge of the body, and the height of the body is H, wherein h≥95%H.

4. The battery pack according to claim 1 or 2, characterized in that: The battery (3) further comprises a shell (301), a cover plate (302) and a pole (303); the cover plate (302) is arranged on the top opening of the shell (301); the pole (303) is arranged on the cover plate (302); and the upper surface of the anti-collision plate (4) is higher than the upper surface of the cover plate (302) and lower than the upper surface of the pole (303).

5. The battery pack according to claim 1 or 2, characterized in that: The thickness of the anti-collision plate (4) is T, and the distance between the first side plate (2) and the battery (3) is L, wherein 70% L≤T≤90% L.

6. The battery pack according to claim 5, characterized in that: The L is 15-50 mm.

7. The battery pack according to claim 1 or 2, characterized in that: The anti-collision plate (4) comprises a fixed adhesive layer (401), a first composite plate (402), an intermediate layer (403) and a second composite plate (404) sequentially arranged along the thickness direction of the anti-collision plate (4); the first composite plate (402) is fixed on the corresponding battery (3) through the fixed adhesive layer (401); the intermediate layer (403) comprises an intermediate plate (4031) and side plates (4032) arranged at both ends of the intermediate plate (4031); the hardness of the intermediate plate (4031) is less than the hardness of the side plates (4032).

8. The battery pack according to claim 7, characterized in that: The side plate (4032) is a solid plate, or the side plate (4032) includes a hollow plate body (4033) and a connecting rib (4034) arranged in the hollow cavity of the hollow plate body (4033).

9. The battery pack according to claim 7, characterized in that: In the longitudinal direction of the anti-collision plate (4), the ratio X of the length B1 of the middle plate (4031) to the length B2 of the side plate (4032) is 15%-50%.

10. The battery pack according to claim 7, characterized in that: The thickness T1 of the first composite plate (402) is greater than the thickness T2 of the second composite plate (404).

11. The battery pack according to claim 7, wherein: The ratio of the thickness T3 of the intermediate layer (403) to the thickness T of the anti-collision plate (4) is 60-99%.

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