Battery and battery pack

Abstract

The utility model relates to new energy battery technical field discloses battery and battery package, wherein the battery, include: casing, the casing has bottom wall and opposite first wall and second wall along the thickness direction, the bottom of first wall is equipped with first round corner, and is connected with the one end of bottom wall through first round corner, the bottom of second wall is equipped with second round corner, and is connected with the opposite other end of bottom wall through second round corner, the radius of first round corner is R1, the radius of second round corner is R2, the height of casing is H1, the thickness of casing is T1, satisfy R1>R2, 0.002≤(R1-R2)XT1 / H1≤0.1. The utility model discloses battery, sets up the first round corner of bigger radius in the bottom of first wall of casing, forms bigger overflow glue space, has improved the bonding strength of battery. Moreover, set up the second round corner of smaller radius in the bottom wall of second wall, can guarantee that the casing has enough gas storage space, reduces the risk of thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, specifically to batteries and battery packs. Background Technology

[0002] With the widespread attention given to new energy battery technology by various countries, new energy batteries have achieved rapid development in multiple fields such as power systems, new energy vehicles, and energy storage power stations.

[0003] Battery packs typically contain multiple batteries, which are secured to the bottom of the pack housing with adhesive. However, existing battery packs have poor connection strength between the batteries and the housing, making the batteries prone to movement and resulting in poor safety performance. Utility Model Content

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem of poor connection strength between the battery and the casing, which makes the battery prone to shaking and leads to poor safety performance of the battery pack.

[0005] In a first aspect, this utility model provides a battery, comprising: a housing, the housing having a first wall and a second wall opposite to each other along the thickness direction, and a bottom wall, the bottom of the first wall having a first rounded corner and being connected to one end of the bottom wall through the first rounded corner, the bottom of the second wall having a second rounded corner and being connected to the other end of the bottom wall through the second rounded corner, the radius of the first rounded corner being R1 in mm, the radius of the second rounded corner being R2 in mm, the height of the housing being H1 in mm, and the thickness of the housing being T1 in mm, satisfying R1>R2, 0.002≤(R1-R2)×T1 / H1≤0.1.

[0006] Secondly, this utility model also provides a battery pack, comprising:

[0007] The box-shaped enclosure has a bottom plate.

[0008] Multiple batteries as described above are arranged side by side inside the housing, and the bottom wall and the bottom plate are fixedly bonded together by an adhesive layer;

[0009] At least one support beam is disposed inside the housing, one side of the support beam being adjacent to the large surface of the battery, and the first wall of the battery facing the support beam.

[0010] Beneficial Effects: The battery of the above technical solution features a large-radius first rounded corner at the bottom of the first wall of the casing, creating a larger space for adhesive overflow. This increases the effective bonding area between the battery casing and the battery pack housing, thereby improving the bonding strength of the casing, reducing the risk of battery shaking, and enhancing the safety of the battery pack. Furthermore, a smaller-radius second rounded corner at the bottom of the second wall of the casing ensures sufficient gas storage space inside the casing, reducing the risk of thermal runaway. By controlling the radii of the first and second rounded corners, the height of the casing, and the thickness of the casing to satisfy the above relationship, the connection stability between the battery and the housing can be further ensured, while also reducing the risk of thermal runaway. If the value of (R1-R2)×T1 / H1 is too large, the internal gas storage space of the battery is small, resulting in greater internal pressure after gas generation, leading to a higher risk of thermal runaway. If the value of (R1-R2)×T1 / H1 is too small, the adhesive overflow space is small, resulting in poor connection strength between the casing and the housing. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0013] Figure 2 This is a partial structural diagram of the battery and support beam of a battery pack according to an embodiment of the present utility model.

[0014] Figure 3 This is a schematic diagram of the battery and heat exchange plate of a battery pack according to an embodiment of the present utility model.

[0015] Figure 4 This is a partially enlarged view of the battery and heat exchange plate of a battery pack according to an embodiment of the present utility model;

[0016] Figure 5 This is another partially enlarged view of the battery and heat exchange plate of a battery pack according to an embodiment of the present utility model;

[0017] Figure 6 This is a schematic diagram of the structure of a battery casing according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Shell; 101. First wall; 102. Second wall; 103. Bottom wall; 104. First rounded corner; 105. Second rounded corner; 2. Battery cell; 3. Support plate; 301. Through hole; 4. Gas storage space;

[0020] 100, Battery; 200, Housing; 210, Base plate; 300, Support beam; 400, Heat exchange plate; 410, Heat exchange channel; 420, Extension section; 500, Adhesive layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the embodiments of the utility model, the "battery pack" is formed by electrically connecting a certain number of batteries together and placing them in a housing to protect the batteries from external impacts, heat, vibration, etc.

[0023] In the embodiments of this utility model, "battery" refers to a single battery cell capable of independent charging and discharging. The components of a battery may include a positive electrode, a negative electrode, a separator, an electrolyte, and outer packaging for encapsulating the positive electrode, negative electrode, separator, and electrolyte. This utility model does not impose any particular limitation on the type or shape of the battery; it can be a blade battery, a square battery, or any other type of battery. The battery in this utility model can be a lithium-ion battery, a potassium-ion battery, a sodium-ion battery, a lithium-sulfur battery, etc., with lithium-ion batteries being particularly preferred. During the charging and discharging process, active ions repeatedly insert and extract between the positive and negative electrode plates. The electrolyte acts as a conductor of ions between the positive and negative electrode plates.

[0024] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a battery is provided, comprising: a housing 1, the housing 1 having a first wall 101 and a second wall 102 opposite to each other along the thickness direction, and a bottom wall 103, the bottom of the first wall 101 having a first rounded corner 104 and being connected to one end of the bottom wall 103 through the first rounded corner 104, the bottom of the second wall 102 having a second rounded corner 105 and being connected to the other end of the bottom wall 103 through the second rounded corner 105, the radius of the first rounded corner 104 being R1 (mm), the radius of the second rounded corner 105 being R2 (mm), the height of the housing 1 being H1 (mm), and the thickness of the housing 1 being T1 (mm), satisfying R1>R2, 0.002≤(R1-R2)×T1 / H1≤0.1.

[0026] Therefore, the battery provided in this embodiment of the present invention has a first rounded corner 104 with a large radius at the bottom of the first wall 101 of the casing 1, which creates a larger space for excess adhesive at the first rounded corner 104. This increases the effective bonding area between the battery casing 1 and the battery pack housing 200, thereby improving the bonding strength of the casing 1, reducing the risk of battery shaking, and improving the safety of the battery pack. Furthermore, a second rounded corner 105 with a smaller radius at the bottom of the second wall 102 of the casing 1 ensures sufficient gas storage space 4 inside the casing 1, reducing the risk of thermal runaway. By controlling the radius of the first rounded corner 104, the radius of the second rounded corner 105, the height of the casing 1, and the thickness of the casing 1 to satisfy the above relationship, the connection stability between the battery and the housing 200 can be further ensured, while reducing the risk of thermal runaway. If the value of (R1-R2)×T1 / H1 is too large, the gas storage space 4 inside the battery will be small, and after gas is generated inside the battery, a large internal pressure will be formed, resulting in a greater risk of thermal runaway. If the value of (R1-R2)×T1 / H1 is too small, the overflow space will be small, and the connection strength between the shell 1 and the box 200 will be poor.

[0027] Specifically, the vertical direction of shell 1, that is, the height direction, is as follows: Figure 2 As indicated by arrow H in the diagram. The thickness direction of housing 1 is as follows. Figure 2 As shown by the arrow W in the image. Figure 6 As shown, the first wall 101 and the second wall 102 of the casing 1 are the two large surfaces of the battery, which are prone to generating a lot of heat and thermal expansion. The casing 1 is generally manufactured by stamping, forming an integral first wall 101, second wall 102, and bottom wall 103. A first rounded corner 104 is formed between the first wall 101 and the bottom wall 103, and a second rounded corner 105 is formed between the second wall 102 and the bottom wall 103. That is, in this embodiment of the present invention, only a large first rounded corner 104 needs to be stamped at the bottom of the first wall 101 to improve the bonding strength of the battery cell 2, which is simple to process and has a low manufacturing cost.

[0028] For example, in the embodiments of this utility model, the value of (R1-R2)×T1 / H1 can be 0.002, 0.02, 0.05, 0.1, etc.

[0029] In one embodiment, 0.5 ≤ R1-R2 ≤ 4.5. By controlling R1-R2 within a suitable range, sufficient space for adhesive overflow at the bottom of the first wall 101 can be ensured, thereby improving the bonding strength of the battery. If the value of R1-R2 is too large, the internal gas storage space 4 of the battery is small, and after gas is generated inside the battery, a large internal pressure is formed, resulting in a greater risk of thermal runaway. If the value of R1-R2 is too small, the adhesive overflow space at the bottom of the first wall 101 is small, and the bonding strength of the battery is weak.

[0030] Furthermore, in one embodiment, 2.5mm≤R1mm≤5mm, 0.2mm≤R2mm≤2.5mm.

[0031] Furthermore, in one embodiment, 0.8mm ≤ T1mm ≤ 2mm.

[0032] Furthermore, in one embodiment, 70mm ≤ H1mm ≤ 250mm.

[0033] For example, in this embodiment of the present invention, the value of R1 can be 2.5mm, the value of R2 can be 0.5mm, the value of T1 can be 1mm, and the value of H1 can be 80mm, then R1-R2 is 2, and (R1-R2)×T1 / H1 is 0.025; or, the value of R1 can be 3mm, the value of R2 can be 2mm, the value of T1 can be 1.5mm, and the value of H1 can be 100mm, then R1-R2 is 1, and (R1-R2)×T1 / H1 is 0.015; or, the value of R1 can be 5mm, the value of R2 can be 2.5mm, the value of T1 can be 2mm, and the value of H1 can be 250mm, then R1-R2 is 2.5, and (R1-R2)×T1 / H1 is 0.02.

[0034] It should be noted that the greater the height H1 of the casing 1, the easier the battery is to shake. Similarly, the smaller the thickness T1 of the casing 1, the easier the battery is to shake.

[0035] In one embodiment, such as Figure 2 and Figure 3 As shown, the battery also includes: a battery cell 2 and a support plate 3. The battery cell 2 is disposed inside the housing 1. The support plate 3 is disposed between the battery cell 2 and the bottom wall 103. The top surface of the support plate 3 is connected to the bottom surface of the battery cell 2 to support the battery cell 2. A gap is left between the bottom surface of the support plate 3 and the bottom wall 103 to form a gas storage space 4. The bottom of the battery cell 2 can be glued to the top surface of the support plate 3 with adhesive.

[0036] Specifically, an explosion-proof valve is also provided on the bottom wall 103 of the casing 1. During normal use, the battery cell 2 will generate gas in a cycle. A gas storage space 4 is formed between the tray 3 and the bottom wall 103 to collect the gas generated by the battery cell 2. In the event of thermal runaway, the gas is discharged through the explosion-proof valve to further improve the safety of the battery.

[0037] In addition, cell 2 can be made from positive electrode sheet, negative electrode sheet and separator through winding process or stacking process.

[0038] In one embodiment, such as Figure 2 As shown, the top surface of the tray 3 is higher than the top of the first rounded corner 104 to ensure that the bottom corner of the battery cell 2 is higher than the first rounded corner 104 and the second rounded corner 105, so as to avoid the bottom of the battery cell 2 from contacting the first rounded corner 104 and the second rounded corner 105, thereby avoiding damage to the battery cell 2.

[0039] It should be noted that the present invention does not limit the installation form of the tray 3, and any existing installation form can be selected as needed. For example, the inner wall of the housing 1 forms a step, and the periphery of the tray 3 overlaps on the step, or the tray 3 is supported on the bottom surface of the housing 1 by a support rib.

[0040] In one embodiment, such as Figure 2 As shown, the tray 3 is provided with at least one through hole 301 so that the gas generated inside the cell 2 can enter the gas storage space 4 below through the through hole 301.

[0041] It should be noted that the number of through holes 301 can be selected as one, two, or more as needed. The shape of the through holes 301 can be selected as a conventional hole or irregular hole, such as a round hole, a square hole, or an elliptical hole, as needed. In this respect, the present invention does not impose too many restrictions.

[0042] Furthermore, in one embodiment, the total opening area of ​​the through hole 301 is S1, and the surface area of ​​the support plate 3 is S2, satisfying 0.4≤S1 / S2≤0.6. By controlling S1 / S2 within a suitable range, the venting effect of the battery cell 2 can be guaranteed, improving the safety of the battery cell 2 in use, while ensuring that the support plate 3 has sufficient support strength to support the battery cell 2.

[0043] For example, in this embodiment of the present invention, the value of S1 / S2 can be 0.4, 0.5, 0.6, etc.

[0044] According to an embodiment of the present invention, on the other hand, as... Figure 1 and Figure 2As shown, a battery pack is also provided, including: a housing 200, a plurality of batteries 100, and at least one support beam 300. The housing 200 has a bottom plate 210. The plurality of batteries 100 are arranged side by side inside the housing 200, and the bottom wall 103 is fixedly bonded to the bottom plate 210 by an adhesive layer 500. The support beam 300 is disposed inside the housing 200, one side of the support beam 300 is adjacent to the large surface of the battery 100, and the first wall 101 of the battery 100 faces the support beam 300.

[0045] Since the electrical device includes a battery pack and has the same effect as the battery pack, it will not be described in detail here.

[0046] Specifically, the support beam 300 is generally fixed to the bottom plate 210 of the housing 200. The fixing method can be any existing fixing method, such as integral molding, adhesive bonding, or bolt fixing. A cavity can be provided inside the support beam 300 to reduce weight and increase structural strength. The adhesive layer 500 is disposed between the bottom wall 103 of the battery 100 and the bottom plate 210 of the housing 200. Due to the presence of the first rounded corner 104 and the second rounded corner 105, the adhesive layer 500 will spread towards the first rounded corner 104 and the second rounded corner 105, i.e., overflow. In this embodiment, a larger radius first rounded corner 104 is provided, expanding the overflow space between the first rounded corner 104, the bottom plate 210, and the support beam 300, thereby improving the bonding strength of the battery 100.

[0047] In addition, the housing 200 may also be provided with side panels, which surround the periphery of the bottom plate 210 and together with the bottom plate 210 form a space for accommodating the battery 100.

[0048] In one embodiment, the thickness of the adhesive layer 500 at the first rounded corner 104 is greater than the thickness at the second rounded corner 105, thereby increasing the bonding strength at the first rounded corner 104, that is, increasing the bonding strength between the battery 100 and the housing 200.

[0049] Since the adhesive layer 500 at the first rounded corner 104 is relatively thick, if the battery 100 shakes under vibration conditions, it will tilt towards the direction of the second rounded corner 105. In order to avoid collision between two adjacent batteries 100, in one embodiment, the first wall 101 and the second wall 102 of the multiple batteries 100 are alternately distributed along the arrangement direction of the multiple batteries 100.

[0050] Furthermore, under vibration conditions, if the battery 100 shakes, since the thickness of the adhesive layer 500 at the first rounded corner 104 is greater than the thickness at the second rounded corner 105 and the first wall 101 faces the support beam 300, the battery 100 will tilt in the direction of the second rounded corner 105, which can also prevent the battery 100 from tilting in the direction of the support beam 300, thereby preventing the battery 100 from colliding with the support beam 300.

[0051] In one embodiment, such as Figure 2 As shown, a gap L1, in mm, is left between the beam surface of the support beam 300 and the first wall 101, satisfying 5 ≤ L1 × R1 ≤ 35. By controlling the value of L1 × R1 within a suitable range, the bonding strength of the battery 100 can be further ensured, as well as sufficient gas storage space 4 inside the battery 100. If the value of L1 × R1 is too large, the gas storage space 4 inside the battery 100 will be small, resulting in high internal gas pressure after gas generation in the battery 100, leading to a greater risk of thermal runaway. If the value of L1 × R1 is too small, the bonding strength of the battery 100 will be low, making it easier for the battery 100 to collide with the support beam 300, resulting in poor safety performance of the battery pack.

[0052] Furthermore, in one embodiment, 2mm ≤ L1mm ≤ 8mm.

[0053] For example, in this embodiment of the present invention, the value of L1 can be 2mm and the value of R1 can be 2.5mm, then L1×R1 is 5; or, the value of L1 can be 5mm and the value of R1 can be 5mm, then L1×R1 is 25; or, the value of L1 can be 8mm and the value of R1 can be 4mm, then L1×R1 is 32.

[0054] In one embodiment, such as Figure 3 and Figure 4 As shown, the battery pack also includes at least one heat exchange plate 400, which is disposed within the housing 200 and located between two adjacent batteries 100. The heat exchange plate 400 has a heat exchange channel 410. A heat exchange medium, such as cooling water, flows within the heat exchange channel 410. The heat exchange plate is used to remove the heat generated by the batteries 100, maintaining the batteries 100 at their normal operating temperature.

[0055] Furthermore, in one embodiment, such as Figure 5 As shown, the top of the heat exchange plate 400 extends along the thickness direction of the battery 100 to form an extension 420, which is installed above the battery 100. The top of the battery 100 generally also has terminals, which are connected to the tabs of the cell 2 via connecting pieces. The terminals are also electrically connected to a busbar to connect multiple batteries 100 in series or parallel. During use, the terminals, connecting pieces, and busbar all generate heat, resulting in a significant amount of heat dissipated from the top of the battery 100. This embodiment of the invention provides an extension 420 installed above the battery 100 on the heat exchange plate 400, which can quickly remove the heat from the top of the battery 100, ensuring that the battery 100 remains within a suitable operating temperature range and thus improving the safety of the battery 100.

[0056] Furthermore, in one embodiment, such as Figure 3As shown, multiple heat exchange plates 400 are provided, and multiple batteries 100 are arranged in pairs. The heat exchange plates 400 are located between the pairs of batteries 100. The first wall 101 of each pair of batteries 100 faces the plate surface of the heat exchange plate 400, and the second wall 102 of each pair of batteries 100 is arranged opposite to each other. The heat exchange plates 400 can dissipate heat from the first walls 101 of the two batteries 100 using both sides, thereby improving heat exchange efficiency, ensuring the bonding strength between the batteries 100 and the heat exchange plates, saving the number of heat exchange plates 400 used, and reducing the cost of use.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The shell (1) has a first wall (101) and a second wall (102) opposite to each other along the thickness direction, and a bottom wall (103). The bottom of the first wall (101) is provided with a first rounded corner (104) and is connected to one end of the bottom wall (103) through the first rounded corner (104). The bottom of the second wall (102) is provided with a second rounded corner (105) and is connected to the other end of the bottom wall (103) through the second rounded corner (105). The radius of the first rounded corner (104) is R1 in mm, the radius of the second rounded corner (105) is R2 in mm, the height of the shell (1) is H1 in mm, and the thickness of the shell (1) is T1 in mm, satisfying R1>R2 and 0.002≤(R1-R2)×T1 / H1≤0.

1.

2. The battery of claim 1, wherein, 0.5≤R1-R2≤4.

5.

3. The battery of claim 2, wherein, 2.5mm≤R1mm≤5mm, 0.2mm≤R2mm≤2.5mm.

4. The battery of claim 1, wherein, 0.8mm≤T1mm≤2mm.

5. The battery of claim 1, wherein, 70mm≤H1mm≤250mm.

6. The battery of any one of claims 1 to 5, wherein, Also includes: The battery cell (2) is disposed inside the housing (1); A support plate (3) is disposed between the battery cell (2) and the bottom wall (103). The top surface of the support plate (3) is connected to the bottom surface of the battery cell (2) to support the battery cell (2). A gap is left between the bottom surface of the support plate (3) and the bottom wall (103) to form a gas storage space (4).

7. The battery of claim 6, wherein, The top surface of the tray (3) is higher than the top of the first rounded corner (104).

8. The battery of claim 6, wherein, The tray (3) is provided with at least one through hole (301).

9. The battery of claim 8, wherein, The total opening area of ​​the through hole (301) is S1, and the plate area of ​​the support plate (3) is S2, satisfying 0.4≤S1 / S2≤0.

6.

10. A battery pack, characterized by, include: The box (200) has a bottom plate (210); The batteries (100) according to any one of claims 1 to 9 are arranged side by side in the housing (200), and the bottom wall (103) and the bottom plate (210) are fixedly bonded by an adhesive layer (500); At least one support beam (300) is disposed inside the housing (200), one side of the support beam (300) is disposed adjacent to the large surface of the battery (100), and the first wall (101) of the battery (100) faces the support beam (300).

11. The battery pack of claim 10, wherein, The thickness of the adhesive layer (500) at the first rounded corner (104) is greater than the thickness at the second rounded corner (105).

12. The battery pack of claim 10, wherein, Along the arrangement direction of the plurality of batteries (100), the first wall (101) and the second wall (102) of the plurality of batteries (100) are alternately distributed.

13. The battery pack of claim 10, wherein, The support beam (300) has a gap L1 between its beam surface and the first wall (101), in mm, which satisfies 5≤L1×R1≤35.

14. The battery pack according to claim 13, characterized in that, 2mm≤L1mm≤8mm.

15. The battery pack of any one of claims 10-14, wherein, The battery pack also includes at least one heat exchange plate (400), which is disposed inside the housing (200) and located between two adjacent batteries (100). The heat exchange plate (400) is provided with a heat exchange channel (410).

16. The battery pack of claim 15, wherein, The top of the heat exchange plate (400) extends along the thickness direction of the battery (100) to form an extension (420), and the extension (420) is mounted above the battery (100).

17. The battery pack according to claim 15, characterized in that, Multiple heat exchange plates (400) are provided, and multiple batteries (100) are arranged in pairs. The heat exchange plates (400) are arranged between the pairs of batteries (100). The first wall (101) of each pair of batteries (100) faces the plate surface of the heat exchange plate (400), and the second wall (102) of each pair of batteries (100) is arranged opposite to each other.

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