Batteries and power equipment

Abstract

This application discloses a battery and a power device, wherein the battery includes: a housing having a first axial direction; and an electrode assembly disposed within the housing; wherein the housing includes a main body portion and a buffer portion sequentially disposed along the first axial direction, a partition portion is disposed between the main body portion and the buffer portion, and the main body portion and the partition portion surround to form a receiving cavity, the electrode assembly is placed within the receiving cavity, and the buffer portion and the partition portion surround to form a buffer cavity. According to this application, by providing a buffer portion on the housing to form a buffer cavity, the buffer cavity absorbs and eliminates the compressive force generated when the battery is subjected to squeezing or impact, thereby preventing damage to the main body portion and the electrode assembly disposed within the main body portion, simplifying the energy-absorbing structure at the bottom of the battery, improving battery safety, and thus improving the safety and explosion-proof venting efficiency of the power device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery and power device. Background Technology

[0002] With the rapid development of new energy technologies, power batteries, as a reliable energy storage device, have been widely used in the automotive field. Power battery cells generally come in three forms: prismatic, pouch, and cylindrical. For prismatic cells, the casing is often made of aluminum or steel, and the overall structure is rectangular. A certain number of cells are arranged and placed in a battery box to form a power unit.

[0003] However, in current new energy vehicles, the power equipment is generally located at the bottom of the vehicle. When the bottom of the power equipment is severely squeezed, it will squeeze a certain side of the battery cell. After the battery cell shell is squeezed, it will directly squeeze the electrode plates inside the battery cell. The squeezed electrode plates are prone to internal short circuits, which can lead to thermal runaway and pose a risk of fire and explosion of the entire power equipment. Summary of the Invention

[0004] Embodiments of this application provide a battery and a power device to improve the safety of the power device.

[0005] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0006] On one hand, this application provides a battery, including: a housing having a first axial direction; and an electrode assembly disposed within the housing;

[0007] The housing includes a main body and a buffer part arranged sequentially along a first axial direction. A partition is provided between the main body and the buffer part. The main body and the partition form a receiving cavity. The pole group is placed in the receiving cavity. The buffer part and the partition form a buffer cavity.

[0008] In addition to one or more of the features disclosed above, or as an alternative, the partition is integrally formed with the housing; or

[0009] The partition is fixedly installed inside the housing.

[0010] In addition to one or more of the features disclosed above, or as an alternative, the housing is manufactured using an extrusion molding process.

[0011] In addition to one or more of the features disclosed above, or as an alternative, the height of the main body along the first axis is H1, and the height of the buffer part along the first axis is H2, satisfying: 1% ≤ H2 / H1 ≤ 25%.

[0012] In addition to one or more of the features disclosed above, or as an alternative, the height H2 of the buffer portion satisfies: 2≤H2≤20mm.

[0013] In addition to one or more of the features disclosed above, or as an alternative, the width of the main body is 12 to 60 mm; and / or the width of the buffer portion is 12 to 60 mm.

[0014] In addition to one or more of the features disclosed above, or as an alternative, the wall thickness of the main body is 0.2 to 1 mm; and / or the wall thickness of the buffer portion and the partition portion is 0.2 to 2 mm.

[0015] In addition to one or more of the features disclosed above, or alternatively, the buffer portion is provided with a bottom region along the first axial direction, and the bottom region of the buffer portion is provided with a placement groove.

[0016] The battery also includes an explosion-proof valve, which is disposed in the placement slot.

[0017] In addition to one or more of the features disclosed above, or alternatively, the housing also has a second axis perpendicular to the first axis, and at least one end of the buffer cavity disposed opposite to the second axis has an opening.

[0018] An explosion-proof valve is installed at the bottom of the electrode assembly, and the buffer chamber at the bottom of the housing serves as the venting channel for the explosion-proof valve. In the event of thermal runaway of the battery cell, high-temperature substances generated can be directionally discharged along the buffer chamber at the bottom of the housing. To further ensure the discharge direction, one end of the buffer chamber at the bottom of the housing can be sealed, for example, with adhesive.

[0019] On the other hand, this application further discloses a power device, which, in addition to one or more of the features disclosed above, or alternatively, includes a battery as described in any of the preceding claims, wherein at least two batteries are provided; and

[0020] A fixed frame has a bottom wall, the batteries are arranged in one or more rows in the fixed frame, and the buffer part is in contact with the bottom wall.

[0021] One of the above technical solutions has the following advantages or beneficial effects: In this application, by setting a buffer part on the shell to form a buffer cavity, the buffer cavity is used to absorb and eliminate the extrusion force generated when the battery is squeezed and impacted, so as to prevent damage to the main body and the electrode group set in the main body, simplify the energy absorption structure at the bottom of the battery, improve the safety of the battery, and thus improve the safety of the power equipment and the exhaust efficiency of the explosion-proof valve. Attached Figure Description

[0022] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0023] Figure 1 This is a three-dimensional structural view of the power equipment provided according to the embodiments of this application;

[0024] Figure 2 This is a cross-sectional view of the power equipment provided according to an embodiment of this application;

[0025] Figure 3 This is a three-dimensional structural view of the battery provided according to an embodiment of this application;

[0026] Figure 4 This is a cross-sectional view of a battery provided according to an embodiment of this application;

[0027] Figure 5 This is a three-dimensional structural view of the housing provided according to an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Battery;

[0030] 110. Shell; 111. Main body; 112. Buffer section; 1121. Placement slot; 113. Divider; 114. Receiving cavity; 115. Buffer cavity;

[0031] 120. Pole group;

[0032] 130. Explosion-proof valve;

[0033] 140. End cap;

[0034] 200. Fixed frame. Detailed Implementation

[0035] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0036] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Currently, the power units of new energy vehicles are generally located at the bottom of the vehicle. These power units typically consist of square battery cells, which are bonded to the bottom of the power unit. When the bottom of the power unit is impacted, the cell casing deforms, compressing the internal structure and potentially causing a short circuit and thermal runaway. Compared to traditional battery system designs, current batteries use additional support structures to maintain a certain gap between the battery cells and the bottom of the power unit; however, this method has limited cushioning effect.

[0040] To address the aforementioned problems, embodiments of this application provide a power device, such as... Figures 1 to 5 As shown, the power device may include: a battery 100, wherein at least two batteries 100 are provided; and a fixed frame 200, wherein the fixed frame 200 has a bottom wall, and the batteries 100 are arranged in one or more rows within the fixed frame 200.

[0041] The battery 100 being arranged in one or more columns within the fixed frame 200 means that the battery 100 is arranged in one column within the fixed frame 200; or, the battery 100 is arranged in two columns within the fixed frame 200; or, the battery 100 is arranged in three columns within the fixed frame 200.

[0042] The specific number of rows of the battery 100 within the fixed frame 200 can be selected by the staff according to the actual situation.

[0043] In the embodiments of this application, the batteries 100 are arranged in a co-layer array along an array direction within the fixed frame 200.

[0044] Specifically, the array direction can be either linear or curved.

[0045] For example, the array direction can be linear, curved, or circular. The specific array direction of the battery 100 can be selected by the operator based on the actual situation.

[0046] By arranging the batteries in different array directions, this application makes the power device applicable to different occasions and versatile.

[0047] In a preferred embodiment of this application, the bottom wall of the fixed frame 200 is made of thin metal sheet.

[0048] Specifically, for example, the bottom wall is made of aluminum sheet; or, for example, it is made of stainless steel sheet; or, for example, it is made of aluminum alloy sheet. The specific material selection for the bottom wall of the fixed frame 200 can be determined by the operator according to the actual situation; this application does not impose specific limitations, as long as it does not affect the effectiveness of this application.

[0049] Understandably, the bottom wall of the fixed frame 200 in this application is made of thin metal sheet. Since the thin metal sheet has a certain anti-compression function, it can initially prevent damage to the main body 111 and the electrode group 120 set in the main body 111 when the power equipment is subjected to compression and impact, thereby improving the safety of the battery and thus improving the safety of the power equipment.

[0050] In the embodiments of this application, reference is made to Figures 3-5 The battery 100 includes: a housing 110 having a first axial direction Z; and an electrode assembly 120 disposed within the housing 110;

[0051] The housing 110 includes a main body 111 and a buffer 112 arranged sequentially along the first axis Z. A partition 113 is provided between the main body 111 and the buffer 112. The main body 111 and the partition 113 surround each other to form a receiving cavity 114. The pole assembly 120 is placed in the receiving cavity 114. The buffer 112 and the partition 113 surround each other to form a buffer cavity 115.

[0052] Furthermore, the buffer portion 112 is in contact with the bottom wall of the fixed frame 200.

[0053] Understandably, in this application, by providing a buffer portion 112 on the housing 110 to form a buffer cavity 115, the buffer cavity 115 is used to absorb and eliminate the compressive force generated when the power equipment is subjected to squeezing and impact, so as to prevent damage to the main body 111 and the electrode assembly 120 disposed in the main body 111, simplifying the energy absorption structure at the bottom of the battery, improving the safety of the battery, and thus improving the safety of the power equipment.

[0054] In one specific embodiment of this application, the partition 113 is integrally formed with the housing 110, thereby facilitating processing and reducing welding steps.

[0055] In another specific embodiment of this application, the partition 113 is fixedly installed inside the housing 110. For example, the partition 113 can be welded to the housing 110; or, for example, the partition 113 can be snap-fitted to the housing 110; or, for example, the partition 113 can be screwed to the housing 110. In this application, the partition 113 is fixedly installed inside the housing 110 to facilitate the overall assembly of the battery, improve battery assembly efficiency, and thus improve the assembly efficiency of the power equipment.

[0056] In the embodiments of this application, reference is made to Figure 3 The battery 100 further includes an end cap 140, which is disposed at a side end of the housing 110. The end cap 140, the main body 111, and the partition 113 surround each other to form a sealed receiving cavity 114. Optionally, the end cap 140 has one positive and one negative output electrode of the electrode group 120; or, the end cap 140 has two positive and two negative output electrodes of the electrode group 120.

[0057] In the embodiments of this application, the shell 110 is made by extrusion molding process, which facilitates the processing and forming of the shell 110. The shell 110 can be extruded in one step to form a double-cavity cross-sectional structure, thereby improving the forming efficiency of the shell 110.

[0058] It should be understood that the molding process of the housing 110 is not limited to extrusion molding. Other molding processes, such as roll forming and die casting, can directly produce the housing 110 in this application and should also be regarded as specific embodiments of this application.

[0059] In a preferred embodiment of this application, the housing 110 is formed by extrusion molding of sheet metal.

[0060] Specifically, the housing 110 can be made of aluminum alloy. Preferably, the housing 110 is made of aluminum alloy sheet, which facilitates the processing of the sheet to form the buffer part 112.

[0061] In the embodiments of this application, the height of the main body 111 along the first axis Z is H1, and the height of the buffer part 112 along the first axis Z is H2, satisfying: 1% ≤ H2 / H1 ≤ 25%. That is, the ratio of the height H2 of the buffer part 112 to the height H1 of the main body 111 can be controlled within the range of 1% to 25%. For example, the ratio of the height H2 of the buffer part 112 to the height H1 of the main body 111 can be one of 1%, 3%, 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19%, 21%, 23%, 25%, or any combination thereof. It is worth noting that the specific value of this ratio is only given as an example, and any value within the range of 1% to 25% is within the protection scope of this application.

[0062] In this application, the ratio of the height H2 of the buffer part 112 to the height H1 of the main body 111 is controlled within the range of 1% to 25% so that the height between the buffer part 112 and the main body 111 has a better molding ratio when the shell 110 is extruded, thereby improving the buffering effect of the buffer part 112 and better protecting the shell 110 placed in the receiving cavity 114.

[0063] In the embodiments of this application, the height H2 of the buffer portion 112 satisfies: 2 ≤ H2 ≤ 20 mm. That is, the height H2 of the buffer portion 112 can be controlled within the range of 2 to 20 mm. For example, the height H2 of the buffer portion 112 can be one of 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, or any combination thereof. It is worth noting that the specific value of the height H2 is given only as an example, and any value of the height H2 within the range of 2 to 20 mm is within the protection scope of this application.

[0064] In this application, the height H2 of the buffer section 112 is controlled within the range of 2 to 20 mm so that the buffer cavity 115 has sufficient buffer space. When the power equipment is impacted and squeezed, the buffer cavity 115 can better deform and absorb energy to ensure that the main body 111 and the pole group 120 placed inside the main body 111 are not damaged, and can better protect the pole group 120, thereby improving the safety of the power equipment.

[0065] In the embodiments of this application, the width of the main body 111 is 12-60 mm. That is, the width of the main body 111 can be controlled within the range of 12-60 mm. For example, the width of the main body 111 can be one or any combination of 12 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, and 60 mm. It is worth noting that the specific value of this width is only given as an example, and any value within the range of 12-60 mm is within the protection scope of this application. In this application, by controlling the width of the main body 111 within the range of 12-60 mm, and by reasonably setting the width of the main body 111, the overall width of the power equipment is minimized while ensuring that the buffer part 112 has a certain resistance to deformation.

[0066] Furthermore, the width of the buffer portion 112 is 12–60 mm. That is, the width of the buffer portion 112 can be controlled within the range of 12–60 mm. For example, the width of the buffer portion 112 can be one or any combination of 12 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, and 60 mm. It is worth noting that the specific value of this width is only given as an example; any value within the range of 12–60 mm is within the protection scope of this application. In this application, by controlling the width of the buffer portion 112 within the range of 12–60 mm, and by reasonably setting the width of the buffer portion 112, the overall width of the power equipment is minimized while ensuring that the buffer portion 112 has a certain resistance to deformation.

[0067] In the embodiments of this application, the wall thickness of the main body 111 is 0.2 to 1 mm. That is, the wall thickness of the main body 111 can be controlled within the range of 0.2 to 1 mm. For example, the wall thickness of the main body 111 can be one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm, or any combination thereof. It is worth noting that the specific value of the wall thickness of the main body 111 is only given as an example, and any value of the wall thickness of the main body 111 within the range of 0.2 to 1 mm is within the protection scope of this application. In this application, by controlling the wall thickness of the main body 111 within the range of 0.2 to 1 mm, and by reasonably setting the wall thickness of the main body 111, the overall width of the power equipment is minimized while ensuring that the buffer part 112 has a certain resistance to deformation.

[0068] Furthermore, the wall thickness of both the buffer portion 112 and the partition portion 113 is 0.2–2 mm. That is, the wall thickness of both the buffer portion 112 and the partition portion 113 can be controlled within the range of 0.2–2 mm. For example, the wall thickness of the buffer portion 112 and the partition portion 113 can be any one of 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm, or any combination thereof. It is worth noting that the specific values ​​of the wall thickness of the buffer portion 112 and the partition portion 113 are given only as examples; any value of the wall thickness of the buffer portion 112 and the partition portion 113 within the range of 0.2–2 mm is within the protection scope of this application. In this application, the wall thickness of both the buffer section 112 and the partition section 113 is controlled within the range of 0.2 to 2 mm. By reasonably setting the wall thickness of the buffer section 112 and the partition section 113, the overall width of the power equipment is minimized while ensuring that the buffer section 112 has a certain resistance to deformation. At the same time, by comparing the wall thickness parameters of the buffer section 112 and the partition section 113 with the wall thickness parameters of the main body 111, it can be seen that the wall thickness of the buffer section 112 and the partition section 113 is greater than the wall thickness of the main body 111. This allows for an appropriate increase in the wall thickness of the buffer section 112 and the partition section 113, thereby enhancing the energy absorption effect of the buffer section 112.

[0069] In the embodiments of this application, reference is made to Figure 3 and Figure 4 The buffer section 112 has a bottom region along the first axial direction Z, and the bottom region of the buffer section 112 has a placement groove 1121.

[0070] The battery also includes an explosion-proof valve 130, which is disposed in the placement slot 1121.

[0071] Understandably, in this application, by providing an explosion-proof valve 130 in the bottom area of ​​the buffer section 112, the buffer chamber 115 can be used as an exhaust channel for the explosion-proof valve 130, thereby allowing high-temperature substances generated in the event of thermal runaway of the pole group 120 to be discharged directionally along the buffer chamber 115, ensuring the high energy efficiency of the power equipment.

[0072] In the embodiments of this application, reference is made to Figure 4 The housing 110 also has a second axis X perpendicular to the first axis Z, and at least one end of the buffer cavity 115, which is disposed opposite to the second axis X, has an opening.

[0073] Specifically, in this application, one end of the buffer cavity 115 along the second axis X can be blocked so that one end of the buffer cavity 115 opposite to the buffer cavity along the second axis X forms an opening, thereby ensuring the exhaust direction in the buffer cavity 115.

[0074] The buffer cavity 115 can be sealed by using glue or by welding a sealing block to one end of the buffer cavity 115 along the second axial direction X.

[0075] In the embodiments of this application, when the batteries 100 are arranged in a row inside the fixed frame 200, one end of the buffer cavity 115 located in the middle region of the fixed frame 200 can be blocked so that the gas generated inside the batteries 100 can be discharged from both sides of the power equipment, thereby improving the exhaust efficiency of the explosion-proof valve and ensuring the high energy efficiency of the power equipment.

[0076] The following uses a lithium-ion battery as an example and specific embodiments to illustrate the preparation of lithium-ion batteries and power equipment. Those skilled in the art will understand that the preparation methods described in this application are merely embodiments, and any other suitable preparation methods are within the scope of this application.

[0077] The following describes a performance evaluation based on embodiments of the lithium-ion battery and power equipment of this application.

[0078] Example 1

[0079] I. Preparation of Power Equipment

[0080] 1. Preparation of positive electrode sheet

[0081] The positive electrode active materials, lithium iron phosphate, conductive carbon black SP, and PVDF, were mixed in a mass ratio of 97:0.7:2.3. Then, NMP was added as a solvent and mixed. After stirring for a certain period of time, a uniform positive electrode slurry with a certain fluidity was obtained. The positive electrode slurry was uniformly coated on both sides of the positive electrode current collector carbon-coated aluminum foil, and then transferred to a 120℃ oven for drying. After rolling, slitting, and cutting, the positive electrode sheet was obtained.

[0082] 2. Preparation of negative electrode sheet

[0083] The negative electrode active materials graphite, conductive carbon black SP, CMC and SBR are mixed in a mass ratio of 96.5:0.5:1.2:1.8. Then, deionized water is added as a solvent and mixed. After stirring for a certain period of time, a uniform negative electrode slurry with a certain fluidity is obtained. The negative electrode slurry is uniformly coated on both sides of the negative electrode current collector copper foil, and then transferred to a 110℃ oven for drying. Then, the negative electrode sheet is obtained by rolling, slitting and cutting.

[0084] 3. Preparation of electrolyte

[0085] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed in a volume ratio of 1:1:1, and then 1 mol / L LiPF6 was added and mixed thoroughly to prepare an electrolyte.

[0086] 4. Preparation of the separating membrane

[0087] PP film is used as the separator.

[0088] 5. Preparation of lithium-ion batteries

[0089] After drying, the negative and positive electrode sheets prepared by the above steps are used together with the separator to prepare a wound cell using a winding machine. The positive and negative electrode tabs are welded to the top cover of the cell, and the welded cell with the top cover is placed into an aluminum shell for encapsulation. After filling with electrolyte and forming and stabilizing, a lithium-ion battery is obtained.

[0090] 6. Preparation of power equipment

[0091] The lithium-ion batteries prepared using the above steps are sequentially mounted on the bottom wall of a fixed frame, and the fixed frame is then encapsulated to obtain the power device.

[0092] The lithium-ion battery casing is equipped with a buffer section, and the bottom wall of the fixed frame is made of thin metal sheet.

[0093] II. Testing Methods

[0094] 1. Extrusion Test Method for Power Equipment

[0095] A compression test was conducted on the prepared power equipment under a compressive force of 25 kN, and the deformation of the battery inside the power equipment was recorded.

[0096] Comparative Example 1

[0097] The power equipment was prepared according to the method of Example 1, and the power equipment was tested according to the test method in Example 1, except for the following differences:

[0098] The lithium-ion battery casing does not have a buffer section, and the bottom wall of the fixed frame 200 is made of thin metal sheet.

[0099] Comparative Example 2

[0100] The power equipment was prepared according to the method of Example 1, and the power equipment was tested according to the test method in Example 1, except for the following differences:

[0101] The lithium-ion battery casing does not have a buffer section, and the bottom wall of the fixed frame 200 is made of non-metallic multilayer composite material plate.

[0102] Comparative Example 3

[0103] The power equipment was prepared according to the method of Example 1, and the power equipment was tested according to the test method in Example 1, except for the following differences:

[0104] The lithium-ion battery casing does not have a buffer section, and the bottom wall of the fixed frame 200 is made of metal sandwich foam material board.

[0105] III. Test Results

[0106] Table 1. Parameters of Example 1 and parameters and test results of Comparative Examples 1-3

[0107]

[0108] Results Analysis: The bottom wall of the fixed frame in this application adopts a thin metal plate design, while the battery casing adopts a buffer design, which significantly improves the deformation effect of the battery when the power equipment is squeezed, and effectively achieves good protection for the battery's internal electrode assembly.

[0109] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A battery, characterized in that, include: A housing having a first axial direction; and a pole assembly disposed within the housing; The housing includes a main body and a buffer part arranged sequentially along a first axial direction. A partition is provided between the main body and the buffer part. The main body and the partition form a receiving cavity. The pole group is placed in the receiving cavity. The buffer part and the partition form a buffer cavity. The height of the main body along the first axis is H1, and the height of the buffer part along the first axis is H2, satisfying: 3% ≤ H2 / H1 ≤ 13%; The height H2 of the buffer section satisfies: 2≤H2≤20mm; The width of the main body is 12-60 mm; the width of the buffer part is 12-60 mm; The wall thickness of the main body is 0.2–1 mm; the wall thickness of both the buffer portion and the partition portion is 0.2–2 mm. The buffer section has a bottom region along the first axial direction, and the bottom region of the buffer section has a placement groove. The battery also includes an explosion-proof valve, which is disposed in the placement slot; The housing also has a second axis perpendicular to the first axis, and at least one end of the buffer cavity disposed opposite to the second axis has an opening.

2. The battery as described in claim 1, characterized in that, The partition is integrally formed with the housing; or The partition is fixedly installed inside the housing.

3. The battery as described in claim 1, characterized in that, The shell is manufactured using an extrusion molding process.

4. A power equipment, characterized in that, Including the battery as described in any one of claims 1 to 3, wherein at least two batteries are provided; and A fixed frame has a bottom wall, the batteries are arranged in one or more rows in the fixed frame, and the buffer part is in contact with the bottom wall.

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