CN219180740U

CN219180740U - Battery, battery pack and vehicle

Info

Publication number: CN219180740U
Application number: CN202320170309.XU
Authority: CN
Inventors: 张芳芳; 林文生; 王高武
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-01-31
Filing date: 2023-01-31
Publication date: 2023-06-13
Anticipated expiration: 2033-01-31
Also published as: WO2024159758A1

Abstract

The utility model discloses a battery, a battery pack and a vehicle, wherein the battery comprises: a pole core; a housing assembly, the housing assembly comprising: the shell body is provided with an explosion-proof valve, at least one end of the shell body in the length direction is open, and the pole core is arranged in the shell body; a cover plate provided at an open end of the case main body; the insulation protection assembly is used for separating the pole core from the shell main body in the circumferential direction of the pole core, and is provided with a weak part which is opposite to the explosion-proof valve. From this, explosion-proof valve sets up on the shell main part to the design restraint of explosion-proof valve is little, can promote the exhaust effect of explosion-proof valve, and the weak portion of insulating protection spare sets up with the explosion-proof valve relatively, and the gas that the polar core produced under the thermal runaway state can break the weak portion and in time discharge through the explosion-proof valve, prevents that the battery from firing, exploding, promotes the security of battery.

Description

Battery, battery pack and vehicle

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery, a battery pack and a vehicle.

Background

When the battery is out of control, a large amount of heat and high temperature gas are generated, and the high temperature gas is discharged through an explosion-proof valve on the housing to prevent the casing of the battery from being broken.

In the related art, the explosion-proof valve is arranged on the cover plate structure provided with the polar column, so that the arrangement space of the explosion-proof valve on the cover plate is limited, the exhaust capacity of the explosion-proof valve is influenced, the exhaust capacity of the explosion-proof valve is smaller than the capacity of the battery for generating gas in a thermal runaway state, and the shell is further caused to have a rupture risk.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery with good explosion-proof performance.

The utility model also provides a battery pack.

The utility model further provides a vehicle.

The battery according to an embodiment of the present utility model includes: a pole core; a housing assembly, the housing assembly comprising: the shell body is opened at least at one end in the length direction, the pole core is arranged in the shell body, and the shell body is provided with an explosion-proof valve; a cover plate provided at an open end of the case main body; the insulation protection assembly separates the pole core from the shell main body in the circumferential direction of the pole core, and is provided with a weak part, and the weak part is opposite to the explosion-proof valve.

According to the battery provided by the embodiment of the utility model, the explosion-proof valve is arranged on the shell main body, so that the design constraint of the explosion-proof valve is small, the exhaust effect of the explosion-proof valve can be improved, the weak part of the insulating protection piece is opposite to the explosion-proof valve, and the gas generated by the pole core in a thermal runaway state can break through the weak part and be timely discharged through the explosion-proof valve, so that the battery is prevented from firing, and the safety of the battery is improved.

According to some embodiments of the utility model, the pole core comprises a plurality of pole pieces, the pole pieces are stacked, and the plane of the pole pieces is perpendicular to the shell main body and is provided with the wall surface of the explosion-proof valve.

According to some embodiments of the utility model, the insulation protection assembly comprises: the baffle is connected with the cover plate, the plane of the baffle is perpendicular to the plane of the pole piece, and the baffle is arranged between the pole core and the wall surface of the shell main body, on which the explosion-proof valve is arranged; an insulating film wound around the separator and the pole core.

According to some embodiments of the utility model, the cover plate comprises: a cover body connected to the case body; the spacer ring is arranged on the surface of one side of the cover plate main body, which is opposite to the pole core, and the partition plate is connected with the spacer ring.

According to some embodiments of the utility model, the spacer is configured as an insulator.

According to some embodiments of the utility model, the spacer is snap-connected to the spacer.

According to some embodiments of the utility model, the frangible portion comprises: a first weak portion formed on the separator; and a second weak portion formed on the insulating film, the first weak portion and the second weak portion being disposed opposite to each other and opposite to the explosion-proof valve.

According to some embodiments of the utility model, the first weak portion includes a first annular recess recessed into the separator in a thickness direction.

According to some embodiments of the utility model, the first weak portion further includes a strip-shaped recess recessed into the separator in a thickness direction, and the strip-shaped recess is provided in the first annular recess, and both ends of the strip-shaped recess are respectively communicated with the first annular recess.

According to some embodiments of the utility model, the first weak portion is configured as a groove recessed in a thickness direction of the separator, and a recessed depth of the groove is D1, and a thickness of the separator is D2, and satisfies a relationship: d2 is 30 percent or less and D1 is 80 percent or less and D2 is 30 percent or less.

According to some embodiments of the utility model, the second weak portion includes a second annular recess recessed into the insulating film in a thickness direction.

According to some embodiments of the utility model, the partition is provided with a first vent hole, the insulating film is provided with a second vent hole, the first vent hole and the second vent hole are arranged opposite to each other, and the first vent hole and the second vent hole are arranged opposite to the wall surface of the shell body, on which the explosion-proof valve is arranged.

According to some embodiments of the utility model, the separator has a thickness of 0.3mm to 1mm.

According to some embodiments of the utility model, the battery is configured as a cuboid, the battery has a length L, a width W, and a thickness D, and satisfies the relationship: L/W is less than or equal to 7, L/D is less than or equal to 40, and W/D is less than or equal to 8.

According to the battery pack provided by the embodiment of the utility model, the battery pack comprises the battery.

According to the vehicle provided by the embodiment of the utility model, the vehicle comprises the battery pack.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of a structure of a battery according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of a battery according to an embodiment of the present utility model;

fig. 3 is a partial cross-sectional view of a battery according to an embodiment of the present utility model;

fig. 4 is a schematic view of a separator according to an embodiment of the present utility model.

Reference numerals:

battery 100,

A pole core 10, a pole lug 11, a pole piece 12,

Housing assembly 20, housing body 21, cover plate 22, cover plate body 221, spacer 222, pole 223, explosion-proof valve 23,

The separator 31, the first weak portion 311, the first annular recess 3111, the stripe-shaped recess 3112, the first exhaust hole 312, the insulating film 32, the second weak portion 321, the second annular recess 3211, and the second exhaust hole 322.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

A battery 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 4.

The battery 100 according to the embodiment of the present utility model includes a pole core 10, a case assembly 20, and an insulation protection assembly.

Wherein, the case assembly 20 includes a case body 21 and a cover plate 22, at least one end of the case body 21 in a length direction is opened, and the pole core 10 is disposed in the case body 21, the case body 21 is provided with an explosion-proof valve 23, the cover plate 22 is disposed at the opened end of the case body 21, and a pole post 223 of the cover plate 22 is electrically connected with the pole core 10.

It is to be understood that the case body 21 may be constructed in a case structure having an open end in the length direction thereof, the pole core 10 may be disposed inside the case body 21 through the open end of the case body 21, and may be further shielded and closed by the cover plate 22. Among them, the case main body 21 may be constructed in a case structure in which only one end is open or both ends are open in the length direction thereof, which is described in terms of the case main body 21 being constructed in a case structure in which both ends are open.

Referring to fig. 2, when the case main body 21 is constructed in a case structure having both ends open, accordingly, the number of cover plates 22 in the battery 100 is two, the two cover plates 22 are respectively disposed at both sides of the case main body 21 in the length direction, and the two cover plates 22 are each provided with a post 223, and the two posts 223 are respectively electrically connected with the positive and negative electrode tabs of the electrode core 10 to form the output terminal of the battery 100. The assembled battery 100 has positive and negative electrode posts disposed on both sides of the battery 100 in the longitudinal direction.

When the battery is out of control, a large amount of heat and high temperature gas are generated, and the high temperature gas is discharged through an explosion-proof valve on the housing to prevent the rupture of the casing of the battery. In the related art, the explosion-proof valve is disposed on the cover plate structure provided with the pole 223, thereby causing the arrangement space of the explosion-proof valve on the cover plate to be limited, affecting the exhaust capability of the explosion-proof valve, causing the exhaust capability of the explosion-proof valve to be smaller than the capability of the battery to generate gas in a thermal runaway state, and further causing the housing to have a risk of rupture.

Referring to fig. 1 and 2, an explosion-proof valve 23 is formed on the case main body 21 such that a large amount of heat and high-temperature gas is generated in the case assembly 20 when thermal runaway of the battery 100 occurs, and the gas can be discharged out of the case assembly 20 through the explosion-proof valve 23. Since the explosion-proof valve 23 is disposed on the case in the present application, the size of the explosion-proof valve 23 is not affected by the size of the cap plate 22, and may be designed according to the capability of the battery 100 to generate gas at the time of thermal runaway so that the explosion-proof valve 23 matches the exhaust capability of the battery 100.

Accordingly, more space for the tab 11 to be led out can be reserved on the cover plate 22, so as to improve the overcurrent capacity of the battery 100.

Referring to fig. 2, an insulation protection assembly is coupled to the cap plate 22, and the insulation protection assembly may separate the pole core 10 from the case body 21 in a circumferential direction of the pole core 10 to insulate the pole core 10, and is provided with a weak portion disposed opposite to the explosion-proof valve 23.

It is understood that the insulation protection assembly is coupled to the cap plate 22, and the insulation protection assembly has good insulation, by which the electrode core 10 and the case body 21 can be insulated and protected to prevent the electrode core 10 from being electrically connected to the case body 21, thereby shorting the battery 100.

Further, the weak portion of the insulation protection assembly has weak structural strength, and when thermal runaway occurs in the battery 100, high-temperature gas generated at the pole core 10 may break through the weak portion of the insulation protection assembly and be timely discharged through the explosion-proof valve 23 disposed opposite to the weak portion. Thereby, the gas discharge effect at the pole core 10 can be ensured while the pole core 10 is insulated by the insulation protection component.

According to the battery 100 of the embodiment of the utility model, the explosion-proof valve 23 is arranged on the shell main body 21, so that the design constraint of the explosion-proof valve 23 is small, the exhaust effect of the explosion-proof valve 23 can be improved, the weak part of the insulating protection piece is opposite to the explosion-proof valve 23, and the gas generated by the pole core 10 in the thermal runaway state can break through the weak part and be timely discharged through the explosion-proof valve 23, thereby preventing the battery 100 from igniting and improving the safety of the battery 100.

In some embodiments of the present utility model, the case main body 21 is constructed in a hollow cylindrical structure with both ends open. Referring to fig. 1 and 2, the case body 21 is configured as a rectangular parallelepiped, that is, the case body 21 is formed around four rectangular wall surfaces, and the explosion-proof valve 23 is disposed on at least one of the four wall surfaces of the case body 21.

When the explosion-proof valves 23 are plural, the plural explosion-proof valves 23 may be arranged on the same wall surface in the case main body 21, or may be arranged on the case main body 21 or two oppositely disposed wall surfaces. It should be noted that, the wall surface on the case main body 21 for disposing the explosion-proof valve 23 may be designed according to the arrangement mode of the battery 100 in practical application, so that the explosion-proof valve 23 is suitable for being disposed at a position where other devices in the environment where the explosion-proof valve is disposed avoid and exhaust is facilitated, which is not limited specifically herein. For example: when a plurality of batteries 100 are sequentially arranged in the thickness direction thereof, the battery 100 may be provided at both ends in the length direction thereof with the polar posts 223, and the explosion-proof valve 23 may be disposed at the upper wall surface or the lower wall surface of the battery 100, so that the battery 100 may be discharged through the explosion-proof valve 23 at the time of thermal runaway.

In some embodiments of the present utility model, the pole core 10 includes a plurality of pole pieces 12, and the plurality of pole pieces 12 are stacked, and the plane of the pole pieces 12 is perpendicular to the wall surface of the case body 21 where the explosion-proof valve 23 is provided. Wherein the stacking direction of the plurality of pole pieces 12 is parallel to the plane in which the explosion-proof valve 23 is located.

It will be appreciated that when thermal runaway of the battery 100 occurs, resulting in the generation of gas by the pole piece 10, the gas may shuttle between the

pole pieces

12 and 12, under the guiding action of the pole pieces 12, allowing the gas to easily reach the explosion-proof valve 23 for effective venting.

As shown in fig. 2, in some embodiments of the utility model, an insulation protection assembly includes: the separator 31 and the insulating film 32, the separator 31 is connected with the cover plate 22, the plane of the separator 31 is perpendicular to the plane of the pole piece 12, the separator 31 is parallel to the wall surface of the shell main body 21 provided with the explosion-proof valve 23, and the separator 31 is arranged between the pole core 10 and the wall surface of the shell main body 21 provided with the explosion-proof valve 23.

Wherein, baffle 31 and pole piece 12 mutually perpendicular set up, and baffle 31 can play the effect of physical support to pole piece 12 to prevent that pole piece 12 from producing too much problem in assembly, transfer, use, reduce the risk that battery 100 appears the short circuit.

The separator 31 is made of a polymer, such as: materials having good insulating properties such as PP (polypropylene), PI (polyimide), PET (polyethylene terephthalate), etc., preferably PET materials, and the material of the separator 31 is not particularly limited.

Further, an insulating film 32 is wound around the separator 31 and the pole core 10 to connect the separator 31 with the pole core 10, and a plurality of surfaces of the pole core 10 in the circumferential direction are wrapped by the insulating film 32 to insulate the pole core 10 from the case main body 21 to prevent the case from being charged. Wherein the above-mentioned "circumferential direction" refers to the surface of the pole core 10 opposite to the case main body 21.

The insulating film 32 is made of a polymer, such as: materials having good insulating properties, such as PP (polypropylene), PI (polyimide), and PET (polyethylene terephthalate), are preferably PET materials, and the material of the insulating film 32 is not particularly limited.

In some embodiments of the present utility model, the thickness of the separator 31 is 0.3mm to 1mm, so that the structural strength of the separator 31 can be ensured, and the separator 31 is prevented from being bent and deformed. After the partition plate 31 is fixedly connected with the pole core 10, poor assembly and damage to the pole core 10 caused by bending of the pole core 10 in the assembly process of the pole core 10 can be effectively relieved.

As shown in fig. 2, in some embodiments of the utility model, the cover plate 22 includes: a cover body 221 and a spacer 222, the cover body 221 being coupled to the case body 21, the spacer 222 being provided on a surface of the cover body 221 opposite to the pole core 10, and the separator 31 being coupled to the spacer 222.

Referring to fig. 2, the spacer 222 is a mounting carrier for the spacer 31, and the spacer 31 is connected to the cap plate 22 through the spacer 222 to dispose the spacer 31 at a position opposite to the pole core 10. Wherein, both ends of the partition plate 31 are respectively connected with the spacers 222 of the two cover plates 22 to be installed and fixed in the case assembly 20 through the spacers 222.

Referring to fig. 2, in some embodiments of the utility model, spacer 222 is configured as an insulator. The spacer 222 is disposed between the pole piece 12 and the cap plate body 221, and the spacer 222 has good insulation performance, so that the pole core 10 can be prevented from being electrically connected with the cap plate body 221.

In some embodiments of the present utility model, the spacer ring 222 is connected to the separator 31 in a clamping manner, which is simple and reliable, so that the connection effect between the separator 31 and the spacer ring 222 can be ensured, and the assembly of the battery 100 is facilitated.

The assembly process of the battery 100 according to the embodiment of the present utility model will be described with reference to fig. 2:

the laminated pole core 10 is completed, the tab 11 is welded with one of the cover plates 22 (i.e. the pole core 10 is electrically connected with the pole post 223 of the cover plate 22), the separator 31 is arranged on the side surface of the pole core 10 (i.e. the side perpendicular to the pole pieces 12), and the separator 31 is connected and matched with the spacer ring 222, so that the pole core 10 is fixed, insulated and physically supported through the separator 31. At this time, the separator 31 may be bonded and fixed to the pole core 10 by means of bonding.

Further, the separator 31 and the pole core 10 are wrapped in the circumferential direction by the insulating film 32, and the end of the insulating film 32 is thermally fused and fixed with the spacer 222, and the pole core 10 wrapped with the insulating film 32 is fitted into the case main body 21.

Further, the other tab 11 of the electrode core 10 is electrically connected with the post 223 of the other cover plate 22, the separator 31 is fixed with the spacer 222 on the cover plate 22, the insulating film 32 is fixed with the spacer 222 by hot melting, and the cover plate main body 221 is welded with the case main body 21, thereby completing the assembly of the battery 100.

In some embodiments of the utility model, the frangible portion comprises: the first weak portion 311 and the second weak portion 321, the first weak portion 311 being formed on the separator 31, the second weak portion 321 being formed on the insulating film 32, the first weak portion 311 and the second weak portion 321 being disposed opposite to each other and each being disposed opposite to the explosion-proof valve 23.

When a large amount of gas is generated from the electrode core 10 in the thermal runaway state of the battery 100, the gas may sequentially break through the first and second

weak portions

311 and 321 to form an exhaust passage on the insulation protection assembly, and the gas may be discharged through the explosion-proof valve 23 after being discharged from the insulation protection assembly.

In some embodiments of the present utility model, the first weak portion 311 includes a first annular recess 3111, the first annular recess 3111 being recessed into the diaphragm 31 in a thickness direction, and the structural strength of the diaphragm 31 at the first weak portion 311 is reduced by forming a recess structure on the diaphragm 31, so that the gas can burst through the first weak portion 311.

It will be appreciated that when gas impinges at the first weakpoint 311, the first annular recess 3111 is more prone to fracture than the region where no recess is provided, so that gas may escape from the first weakpoint 311.

In a further embodiment of the utility model, the first annular recess 3111 is arranged opposite to the outer contour of the explosion proof valve 23, and when the first annular recess 3111 is broken, gas may impinge on the explosion proof valve 23 to facilitate the evacuation of gas through the explosion proof valve 23.

The area size of the first annular concave portion 3111 formed around is S1, the area size of the rupture disk in the rupture valve 23 is S2, and the relation 0.8.ltoreq.s1/S2.ltoreq.1.2 is satisfied. Thereby, the exhaust effect at the explosion-proof valve 23 can be ensured.

In some embodiments of the present utility model, the first weak portion 311 further includes a bar-shaped recess 3112, the bar-shaped recess 3112 is recessed into the partition 31 in a thickness direction, and the bar-shaped recess 3112 is provided in the first annular recess 3111, and both ends of the bar-shaped recess 3112 are respectively communicated with the first annular recess 3111, so as to further reduce structural strength at the first weak portion 311, and facilitate rupture of the first weak portion 311 under impact of gas.

Referring to fig. 4, the first weak portion 311 is provided with two strip-shaped recesses 3112, the two strip-shaped recesses 3112 are arranged in a crossing manner to form a cross-shaped groove structure, the structure strength of the crossing position of the two strip-shaped recesses 3112 is weak, smaller fragments can be formed when gas impacts the first weak portion 311, and the fragments generated after the first weak portion 311 is broken are prevented from being too large to block the discharge port of the explosion-proof valve 23, so that the explosion-release function of the explosion-proof valve 23 is ensured.

Alternatively, the recessed depth of the strip-shaped recess 3112 on the partition 31 is 30% -80% of the thickness of the partition 31, and the width of the strip-shaped recess 3112 ranges from 0.3mm to 2mm.

In some embodiments of the present utility model, the first weak portion 311 is configured as a groove, which is recessed in the thickness direction of the separator 31, and the recessed depth of the groove is D1, the thickness of the separator 31 is D2, and the relationship is satisfied: d2 is 30 percent or less and D1 is 80 percent or less and D2 is 30 percent or less. When the concave penetration of the groove and the thickness of the separator 31 satisfy the above-described relation, the first weak portion 311 is facilitated to be ruptured by the impact of the gas.

In the embodiment of the present utility model, the second weak portion 321 includes the second annular recess 3211, and the second annular recess 3211 is recessed into the insulating film 32 in the thickness direction, so that the structural strength of the insulating film 32 at the second weak portion 321 is reduced by forming a recess structure on the insulation, so that the gas breaks through the second weak portion 321.

Further, the second annular recess 3211 is provided to face the outer contour of the explosion-proof valve 23, so that the second weak portion 321 can sufficiently correspond to the explosion-proof valve 23, thereby improving the exhaust effect of the battery 100.

As shown in fig. 3, in some embodiments of the present utility model, the separator 31 is provided with a first vent hole 312, the insulating film 32 is provided with a second vent hole 322, the first vent hole 312 is disposed opposite to the second vent hole 322, and both the first vent hole 312 and the second vent hole 322 are disposed opposite to the wall surface of the case main body 21 where the explosion-proof valve 23 is disposed.

When thermal runaway occurs in the battery 100, the gas generated from the electrode core 10 may be discharged out of the insulation protection assembly through the first and second gas discharge holes 312 and 322, thereby ensuring that the thermal runaway gas flow can be effectively discharged in time.

Here, the shape of the vent holes (the first vent hole 312 and the second vent hole 322) is not particularly limited herein, and the vent holes may be configured in a circular shape, an oval shape, a square shape, a polygonal shape, or the like. Preferably, the vent hole is in a circular structure, the circular manufacturing process is simple, and the vent hole is convenient to process.

The number of the exhaust holes (the first exhaust hole 312 and the second exhaust hole 322) is not limited. Wherein, the ratio of the effective exhaust area of the exhaust hole to the area of the surface of the baffle plate 31 where the exhaust hole is located is in the range of 0.2-0.8 to ensure the exhaust effect at the baffle plate 31.

Wherein the second exhaust hole 322 is formed on the insulating film 32, the insulating film 32 may be wound in multiple layers on the separator 31 and the core 10, and the second exhaust hole 322 may be formed on the outermost insulating film 32 and disposed opposite to the first exhaust hole 312. Thus, when the gas is generated from the core 10, the gas may break through the insulating film 32 where the thickness is thin (i.e., the second exhaust hole 322 is provided) so that the gas is discharged to the explosion-proof valve 23 through the insulating protection member.

As shown in fig. 1, in some embodiments of the present utility model, the battery 100 is configured as a rectangular parallelepiped, the battery 100 has a length L, a width W, and a thickness D, and satisfies the relationship: L/W is less than or equal to 7, L/D is less than or equal to 40, and W/D is less than or equal to 8. Therefore, the battery 100 is configured as a cuboid, the pole 223 of the battery 100 is arranged at two ends of the length direction of the battery 100, the explosion-proof valve 23 is formed on the shell main body 21, the explosion-proof valve 23 and the pole 223 do not interfere with each other, so that the setting position and the size of the explosion-proof valve 23 on the shell main body 21 can be adjusted according to design requirements, the exhaust explosion venting capacity of the battery 100 is improved, the lug 11 of the sufficient space supply pole core 10 can be reserved at the cover plate 22 to be led out, and the overcurrent capacity of the battery 100 is ensured.

In some embodiments of the present utility model, the battery 100 is configured as a rectangular parallelepiped, and the surface area of the battery 100 is S, the volume is V, and the ratio of the value of the surface area S to the volume V is 0.05 or more.

In some embodiments of the present utility model, the electrode core 10 wrapping the insulating film 32 is in clearance fit with the inner wall surface of the case body 21 so as to reserve a gap between the insulating film 32 and the case body 21, and the gas generated by the electrode core 10 in the thermal runaway state can reach the explosion-proof valve 23 through the gap to be discharged, so that the discharge path of the runaway gas is effectively increased, and the discharge efficiency of the gas is improved.

Further, the width dimension of the pole core 10 wrapping the insulating film 32 is 0.93 to 0.98 of the width dimension of the case main body 21, so that a gap is reserved between the insulating film 32 and the case main body 21 to increase the exhaust path of the runaway gas.

According to the battery pack of the embodiment of the utility model, the battery pack comprises the battery.

It should be noted that, the battery pack has two forms including a battery module and a non-battery module, that is, the battery module may be applied to the battery pack after the battery modules are formed by the plurality of batteries 100, and the battery 100 may be directly applied to the battery pack (that is, the battery modules do not need to be formed).

Wherein, the battery pack contains a BMS (i.e., battery management system) that can be used to monitor the state of the battery to prevent overcharge and overdischarge of the battery from occurring, and to extend the service life of the battery.

According to the vehicle of the embodiment of the utility model, the vehicle comprises the battery pack.

The following are fused as needed to be written in the writing process to explain the relevant content:

in the description of the present utility model, 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", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

In the description of the present utility model, "plurality" means two or more.

In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, comprising:

a pole piece (10);

a housing assembly (20), the housing assembly (20) comprising:

a case main body (21), wherein at least one end of the case main body (21) in the length direction is open, the pole core (10) is arranged in the case main body (21), and the case main body (21) is provided with an explosion-proof valve (23);

a cover plate (22), the cover plate (22) being provided at an open end of the case main body (21);

an insulation protection assembly which separates the pole core (10) from the shell body (21) in the circumferential direction of the pole core (10), and which is provided with a weak portion which is arranged opposite to the explosion-proof valve (23).

2. The battery according to claim 1, characterized in that the pole core (10) comprises a plurality of pole pieces (12), and a plurality of pole pieces (12) are stacked, and the plane of the pole pieces (12) is perpendicular to the wall surface of the case main body (21) provided with the explosion-proof valve (23).

3. The battery of claim 2, wherein the insulating protection assembly comprises:

the partition board (31), the said partition board (31) couples to said cover plate (22), the said level that the said partition board (31) locates and said level that the pole piece (12) locates are perpendicular to each other, and the said partition board (31) is set up between said pole core (10) and said shell body (21) has said wall surface of the explosion-proof valve (23);

an insulating film (32), the insulating film (32) being wound around the separator (31) and the pole core (10).

4. A battery according to claim 3, wherein the cover plate (22) comprises:

-a cover body (221), said cover body (221) being connected to said housing body (21);

and a spacer ring (222), wherein the spacer ring (222) is arranged on the surface of one side of the cover plate main body (221) opposite to the pole core (10), and the separator (31) is connected with the spacer ring (222).

5. The battery according to claim 4, wherein the spacer (222) is configured as an insulator.

6. The battery according to claim 4, wherein the spacer (222) is snap-connected to the separator (31).

7. A battery according to claim 3, wherein the frangible portion comprises:

a first weak portion (311), the first weak portion (311) being formed on the separator (31);

and a second weak portion (321), wherein the second weak portion (321) is formed on the insulating film (32), and the first weak portion (311) and the second weak portion (321) are disposed opposite to each other and opposite to the explosion-proof valve (23).

8. The battery according to claim 7, wherein the first weak portion (311) includes a first annular recess (3111), the first annular recess (3111) being recessed into the separator (31) in a thickness direction.

9. The battery according to claim 8, wherein the first weak portion (311) further includes a strip-shaped recess (3112), the strip-shaped recess (3112) is recessed into the separator (31) in a thickness direction, and the strip-shaped recess (3112) is provided in the first annular recess (3111), both ends of the strip-shaped recess (3112) are respectively communicated with the first annular recess (3111).

10. The battery according to claim 7, wherein the first weak portion (311) is configured as a groove that is recessed in a thickness direction of the separator (31) and has a recessed depth D1, the separator (31) has a thickness D2, and the relation is satisfied: d2 is 30 percent or less and D1 is 80 percent or less and D2 is 30 percent or less.

11. The battery according to claim 7, wherein the second weak portion (321) includes a second annular recess (3211), the second annular recess (3211) being recessed in the thickness direction into the insulating film (32).

12. A battery according to claim 3, wherein the separator (31) is provided with a first vent hole (312), the insulating film (32) is provided with a second vent hole (322), the first vent hole (312) is disposed opposite to the second vent hole (322), and the first vent hole (312) and the second vent hole (322) are disposed opposite to a wall surface of the case main body (21) provided with the explosion-proof valve (23).

13. A battery according to claim 3, characterized in that the separator (31) has a thickness of 0.3mm-1mm.

14. The battery according to claim 1, wherein the battery is configured as a rectangular parallelepiped, has a length L, a width W, and a thickness D, and satisfies the relationship: L/W is less than or equal to 7, L/D is less than or equal to 40, and W/D is less than or equal to 8.

15. A battery pack, characterized in that the battery pack comprises a battery according to any one of claims 1-14.

16. A vehicle characterized in that it comprises a battery pack according to claim 15.